diff --git a/lib.commonjs/_tests/test-utxo-coinselection.d.ts b/lib.commonjs/_tests/test-utxo-coinselection.d.ts
new file mode 100644
index 00000000..c1dd221a
--- /dev/null
+++ b/lib.commonjs/_tests/test-utxo-coinselection.d.ts
@@ -0,0 +1,2 @@
+export {};
+//# sourceMappingURL=test-utxo-coinselection.d.ts.map
\ No newline at end of file
diff --git a/lib.commonjs/_tests/test-utxo-coinselection.d.ts.map b/lib.commonjs/_tests/test-utxo-coinselection.d.ts.map
new file mode 100644
index 00000000..a0513c5c
--- /dev/null
+++ b/lib.commonjs/_tests/test-utxo-coinselection.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"test-utxo-coinselection.d.ts","sourceRoot":"","sources":["../../src.ts/_tests/test-utxo-coinselection.ts"],"names":[],"mappings":""}
\ No newline at end of file
diff --git a/lib.commonjs/_tests/test-utxo-coinselection.js b/lib.commonjs/_tests/test-utxo-coinselection.js
new file mode 100644
index 00000000..866e6d0f
--- /dev/null
+++ b/lib.commonjs/_tests/test-utxo-coinselection.js
@@ -0,0 +1,101 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+const tslib_1 = require("tslib");
+const assert_1 = tslib_1.__importDefault(require("assert"));
+const coinselector_fewest_1 = require("../transaction/coinselector-fewest");
+const utxo_1 = require("../transaction/utxo");
+const TEST_SPEND_ADDRESS = "0x00539bc2CE3eD0FD039c582CB700EF5398bB0491";
+const TEST_RECEIVE_ADDRESS = "0x02b9B1D30B6cCdc7d908B82739ce891463c3FA19";
+// Utility function to create UTXOs (adjust as necessary)
+function createUTXOs(denominations) {
+    return denominations.map(denomination => ({
+        denomination,
+        address: TEST_SPEND_ADDRESS
+    }));
+}
+describe("FewestCoinSelector", function () {
+    describe("Selecting valid UTXOs", function () {
+        it("selects a single UTXO that exactly matches the target amount", function () {
+            const availableUTXOs = createUTXOs([utxo_1.denominations[1], utxo_1.denominations[2], utxo_1.denominations[3]]); // .065 Qi
+            const targetSpend = { value: utxo_1.denominations[3], address: TEST_RECEIVE_ADDRESS }; // .05 Qi
+            const selector = new coinselector_fewest_1.FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // A single 0.05 Qi UTXO should have been selected
+            assert_1.default.strictEqual(result.inputs.length, 1);
+            assert_1.default.strictEqual(result.inputs[0].denomination, utxo_1.denominations[3]);
+            // A single new 0.05 Qi UTXO should have been outputed
+            assert_1.default.strictEqual(result.spendOutputs.length, 1);
+            assert_1.default.strictEqual(result.spendOutputs[0].denomination, utxo_1.denominations[3]);
+            // No change should be returned
+            assert_1.default.strictEqual(result.changeOutputs.length, 0);
+        });
+        it("selects multiple UTXOs whose combined value meets the target amount", function () {
+            const availableUTXOs = createUTXOs([utxo_1.denominations[1], utxo_1.denominations[2], utxo_1.denominations[2], utxo_1.denominations[3]]); // .075 Qi
+            const targetSpend = { value: utxo_1.denominations[2] + utxo_1.denominations[3], address: TEST_RECEIVE_ADDRESS }; // .06 Qi
+            const selector = new coinselector_fewest_1.FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // 2 UTXOs should have been selected for a total of .06 Qi
+            assert_1.default.strictEqual(result.inputs.length, 2);
+            const inputValue = result.inputs[0].denomination + result.inputs[1].denomination;
+            assert_1.default.strictEqual(inputValue, utxo_1.denominations[2] + utxo_1.denominations[3]);
+            // 2 new UTxOs should have been outputed for a total of .06 Qi
+            assert_1.default.strictEqual(result.spendOutputs.length, 2);
+            const spendValue = result.spendOutputs[0].denomination + result.spendOutputs[1].denomination;
+            assert_1.default.strictEqual(spendValue, utxo_1.denominations[2] + utxo_1.denominations[3]);
+            // No change should be returned
+            assert_1.default.strictEqual(result.changeOutputs.length, 0);
+        });
+        it("selects a single UTXO that is larger than the target amount, ensuring change is correctly calculated", function () {
+            const availableUTXOs = createUTXOs([utxo_1.denominations[2], utxo_1.denominations[4]]); // .11 Qi
+            const targetSpend = { value: utxo_1.denominations[3], address: TEST_RECEIVE_ADDRESS }; // .05 Qi
+            const selector = new coinselector_fewest_1.FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // A single 0.1 Qi UTXO should have been selected
+            assert_1.default.strictEqual(result.inputs.length, 1);
+            assert_1.default.strictEqual(result.inputs[0].denomination, utxo_1.denominations[4]);
+            // A single new 0.05 Qi UTXO should have been outputed
+            assert_1.default.strictEqual(result.spendOutputs.length, 1);
+            assert_1.default.strictEqual(result.spendOutputs[0].denomination, utxo_1.denominations[3]);
+            // 0.05 Qi should be returned in change
+            assert_1.default.strictEqual(result.changeOutputs.length, 1);
+            assert_1.default.strictEqual(result.changeOutputs[0].denomination, utxo_1.denominations[3]);
+        });
+        it("selects multiple UTXOs where the total exceeds the target amount, ensuring change is correctly calculated", function () {
+            const availableUTXOs = createUTXOs([
+                utxo_1.denominations[2],
+                utxo_1.denominations[4],
+                utxo_1.denominations[4],
+                utxo_1.denominations[4],
+                utxo_1.denominations[5]
+            ]); // .56 Qi
+            const targetSpend = { value: utxo_1.denominations[6], address: TEST_RECEIVE_ADDRESS }; // .5 Qi
+            const selector = new coinselector_fewest_1.FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // 4 UTXOs should have been selected for a total of .55 Qi
+            assert_1.default.strictEqual(result.inputs.length, 4);
+            const inputValue = result.inputs[0].denomination + result.inputs[1].denomination + result.inputs[2].denomination + result.inputs[3].denomination;
+            assert_1.default.strictEqual(inputValue, utxo_1.denominations[4] + utxo_1.denominations[4] + utxo_1.denominations[4] + utxo_1.denominations[5]);
+            // A single new 0.5 Qi UTXO should have been outputed 
+            assert_1.default.strictEqual(result.spendOutputs.length, 1);
+            assert_1.default.strictEqual(result.spendOutputs[0].denomination, utxo_1.denominations[6]);
+            // 0.05 Qi should be returned in change
+            assert_1.default.strictEqual(result.changeOutputs.length, 1);
+            assert_1.default.strictEqual(result.changeOutputs[0].denomination, utxo_1.denominations[3]);
+        });
+    });
+    describe("Selecting valid UTXOs", function () {
+        it("throws an error when there are insufficient funds", function () {
+            const selector = new coinselector_fewest_1.FewestCoinSelector(createUTXOs([utxo_1.denominations[0], utxo_1.denominations[0]]));
+            assert_1.default.throws(() => selector.performSelection({ value: utxo_1.denominations[3], address: TEST_RECEIVE_ADDRESS }), /Insufficient funds/);
+        });
+        it("throws an error when no UTXOs are available", function () {
+            const selector = new coinselector_fewest_1.FewestCoinSelector([]);
+            assert_1.default.throws(() => selector.performSelection({ value: utxo_1.denominations[2], address: TEST_RECEIVE_ADDRESS }), /No UTXOs available/);
+        });
+        it("throws an error when the target amount is negative", function () {
+            const selector = new coinselector_fewest_1.FewestCoinSelector(createUTXOs([utxo_1.denominations[2], utxo_1.denominations[2]]));
+            assert_1.default.throws(() => selector.performSelection({ value: -utxo_1.denominations[1], address: TEST_RECEIVE_ADDRESS }), /Target amount must be greater than 0/);
+        });
+    });
+});
+//# sourceMappingURL=test-utxo-coinselection.js.map
\ No newline at end of file
diff --git a/lib.commonjs/_tests/test-utxo-coinselection.js.map b/lib.commonjs/_tests/test-utxo-coinselection.js.map
new file mode 100644
index 00000000..3b514bcd
--- /dev/null
+++ b/lib.commonjs/_tests/test-utxo-coinselection.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib.commonjs/transaction/abstract-coinselector.d.ts b/lib.commonjs/transaction/abstract-coinselector.d.ts
new file mode 100644
index 00000000..1e73fa8c
--- /dev/null
+++ b/lib.commonjs/transaction/abstract-coinselector.d.ts
@@ -0,0 +1,50 @@
+import { UTXO, UTXOLike } from "./utxo.js";
+export type SpendTarget = {
+    address: string;
+    value: bigint;
+};
+export type SelectedCoinsResult = {
+    inputs: UTXO[];
+    spendOutputs: UTXO[];
+    changeOutputs: UTXO[];
+};
+/**
+ * An **AbstractCoinSelector** provides a base class for other sub-classes to
+ * implement the functionality for selecting UTXOs for a spend and to properly
+ * handle spend and change outputs.
+ *
+ * This class is abstract and should not be used directly. Sub-classes should
+ * implement the [[performSelection]] method to provide the actual coin
+ * selection logic.
+ *
+ * @abstract
+ */
+export declare abstract class AbstractCoinSelector {
+    #private;
+    get availableUXTOs(): UTXO[];
+    set availableUXTOs(value: UTXOLike[]);
+    get spendOutputs(): UTXO[];
+    set spendOutputs(value: UTXOLike[]);
+    get changeOutputs(): UTXO[];
+    set changeOutputs(value: UTXOLike[]);
+    /**
+     * Constructs a new AbstractCoinSelector instance with an empty UTXO array.
+     */
+    constructor(availableUXTOs?: UTXOLike[]);
+    /**
+     * This method should be implemented by sub-classes to provide the actual
+     * coin selection logic. It should select UTXOs from the available UTXOs
+     * that sum to the target amount and return the selected UTXOs as well as
+     * the spend and change outputs.
+     * @param target The target amount to select UTXOs for.
+     */
+    abstract performSelection(target: SpendTarget): SelectedCoinsResult;
+    /**
+     * Validates the provided UTXO instance. In order to be valid for coin
+     * selection, the UTXO must have a valid address and denomination.
+     * @param utxo The UTXO instance to validate.
+     * @throws An error if the UTXO instance is invalid.
+     */
+    protected _validateUTXO(utxo: UTXO): void;
+}
+//# sourceMappingURL=abstract-coinselector.d.ts.map
\ No newline at end of file
diff --git a/lib.commonjs/transaction/abstract-coinselector.d.ts.map b/lib.commonjs/transaction/abstract-coinselector.d.ts.map
new file mode 100644
index 00000000..c207e70d
--- /dev/null
+++ b/lib.commonjs/transaction/abstract-coinselector.d.ts.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib.commonjs/transaction/abstract-coinselector.js b/lib.commonjs/transaction/abstract-coinselector.js
new file mode 100644
index 00000000..12c07623
--- /dev/null
+++ b/lib.commonjs/transaction/abstract-coinselector.js
@@ -0,0 +1,64 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.AbstractCoinSelector = void 0;
+const utxo_js_1 = require("./utxo.js");
+/**
+ * An **AbstractCoinSelector** provides a base class for other sub-classes to
+ * implement the functionality for selecting UTXOs for a spend and to properly
+ * handle spend and change outputs.
+ *
+ * This class is abstract and should not be used directly. Sub-classes should
+ * implement the [[performSelection]] method to provide the actual coin
+ * selection logic.
+ *
+ * @abstract
+ */
+class AbstractCoinSelector {
+    #availableUXTOs;
+    #spendOutputs;
+    #changeOutputs;
+    get availableUXTOs() { return this.#availableUXTOs; }
+    set availableUXTOs(value) {
+        this.#availableUXTOs = value.map((val) => {
+            const utxo = utxo_js_1.UTXO.from(val);
+            this._validateUTXO(utxo);
+            return utxo;
+        });
+    }
+    get spendOutputs() { return this.#spendOutputs; }
+    set spendOutputs(value) {
+        this.#spendOutputs = value.map((utxo) => utxo_js_1.UTXO.from(utxo));
+    }
+    get changeOutputs() { return this.#changeOutputs; }
+    set changeOutputs(value) {
+        this.#changeOutputs = value.map((utxo) => utxo_js_1.UTXO.from(utxo));
+    }
+    /**
+     * Constructs a new AbstractCoinSelector instance with an empty UTXO array.
+     */
+    constructor(availableUXTOs = []) {
+        this.#availableUXTOs = availableUXTOs.map((val) => {
+            const utxo = utxo_js_1.UTXO.from(val);
+            this._validateUTXO(utxo);
+            return utxo;
+        });
+        this.#spendOutputs = [];
+        this.#changeOutputs = [];
+    }
+    /**
+     * Validates the provided UTXO instance. In order to be valid for coin
+     * selection, the UTXO must have a valid address and denomination.
+     * @param utxo The UTXO instance to validate.
+     * @throws An error if the UTXO instance is invalid.
+     */
+    _validateUTXO(utxo) {
+        if (utxo.address == null) {
+            throw new Error("UTXO address is required");
+        }
+        if (utxo.denomination == null) {
+            throw new Error("UTXO denomination is required");
+        }
+    }
+}
+exports.AbstractCoinSelector = AbstractCoinSelector;
+//# sourceMappingURL=abstract-coinselector.js.map
\ No newline at end of file
diff --git a/lib.commonjs/transaction/abstract-coinselector.js.map b/lib.commonjs/transaction/abstract-coinselector.js.map
new file mode 100644
index 00000000..a505c8f9
--- /dev/null
+++ b/lib.commonjs/transaction/abstract-coinselector.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"abstract-coinselector.js","sourceRoot":"","sources":["../../src.ts/transaction/abstract-coinselector.ts"],"names":[],"mappings":";;;AAAA,uCAA2C;AAa3C;;;;;;;;;;GAUG;AACH,MAAsB,oBAAoB;IACtC,eAAe,CAAS;IACxB,aAAa,CAAS;IACtB,cAAc,CAAS;IAEvB,IAAI,cAAc,KAAa,OAAO,IAAI,CAAC,eAAe,CAAC,CAAC,CAAC;IAC7D,IAAI,cAAc,CAAC,KAAiB;QAChC,IAAI,CAAC,eAAe,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,GAAa,EAAE,EAAE;YAC/C,MAAM,IAAI,GAAG,cAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;YAC5B,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,CAAC;YACzB,OAAO,IAAI,CAAC;QAChB,CAAC,CAAC,CAAC;IACP,CAAC;IAED,IAAI,YAAY,KAAa,OAAO,IAAI,CAAC,aAAa,CAAC,CAAC,CAAC;IACzD,IAAI,YAAY,CAAC,KAAiB;QAC9B,IAAI,CAAC,aAAa,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,IAAc,EAAE,EAAE,CAAC,cAAI,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC;IACxE,CAAC;IAED,IAAI,aAAa,KAAa,OAAO,IAAI,CAAC,cAAc,CAAC,CAAC,CAAC;IAC3D,IAAI,aAAa,CAAC,KAAiB;QAC/B,IAAI,CAAC,cAAc,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,IAAc,EAAE,EAAE,CAAC,cAAI,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC;IACzE,CAAC;IAED;;OAEG;IACH,YAAY,iBAA6B,EAAE;QACvC,IAAI,CAAC,eAAe,GAAG,cAAc,CAAC,GAAG,CAAC,CAAC,GAAa,EAAE,EAAE;YACxD,MAAM,IAAI,GAAG,cAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;YAC5B,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,CAAC;YACzB,OAAO,IAAI,CAAC;QAChB,CAAC,CAAC,CAAC;QACH,IAAI,CAAC,aAAa,GAAG,EAAE,CAAC;QACxB,IAAI,CAAC,cAAc,GAAG,EAAE,CAAC;IAC7B,CAAC;IAWD;;;;;OAKG;IACO,aAAa,CAAC,IAAU;QAC9B,IAAI,IAAI,CAAC,OAAO,IAAI,IAAI,EAAE;YACtB,MAAM,IAAI,KAAK,CAAC,0BAA0B,CAAC,CAAC;SAC/C;QAED,IAAI,IAAI,CAAC,YAAY,IAAI,IAAI,EAAE;YAC3B,MAAM,IAAI,KAAK,CAAC,+BAA+B,CAAC,CAAC;SACpD;IACL,CAAC;CAIJ;AAhED,oDAgEC"}
\ No newline at end of file
diff --git a/lib.commonjs/transaction/coinselector-fewest.d.ts b/lib.commonjs/transaction/coinselector-fewest.d.ts
new file mode 100644
index 00000000..8b597438
--- /dev/null
+++ b/lib.commonjs/transaction/coinselector-fewest.d.ts
@@ -0,0 +1,24 @@
+import { AbstractCoinSelector, SelectedCoinsResult, SpendTarget } from "./abstract-coinselector.js";
+/**
+ * The FewestCoinSelector class provides a coin selection algorithm that selects
+ * the fewest UTXOs required to meet the target amount. This algorithm is useful
+ * for minimizing the size of the transaction and the fees associated with it.
+ *
+ * This class is a sub-class of [[AbstractCoinSelector]] and implements the
+ * [[performSelection]] method to provide the actual coin selection logic.
+ */
+export declare class FewestCoinSelector extends AbstractCoinSelector {
+    /**
+     * The largest first coin selection algorithm.
+     *
+     * This algorithm selects the largest UTXOs first, and continues to select UTXOs until the
+     * target amount is reached. If the total value of the selected UTXOs is greater than the
+     * target amount, the remaining value is returned as a change output.
+     * @param target The target amount to select UTXOs for.
+     */
+    performSelection(target: SpendTarget): SelectedCoinsResult;
+    private sortUTXOsByDenomination;
+    private validateTarget;
+    private validateUTXOs;
+}
+//# sourceMappingURL=coinselector-fewest.d.ts.map
\ No newline at end of file
diff --git a/lib.commonjs/transaction/coinselector-fewest.d.ts.map b/lib.commonjs/transaction/coinselector-fewest.d.ts.map
new file mode 100644
index 00000000..d6100187
--- /dev/null
+++ b/lib.commonjs/transaction/coinselector-fewest.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"coinselector-fewest.d.ts","sourceRoot":"","sources":["../../src.ts/transaction/coinselector-fewest.ts"],"names":[],"mappings":"AACA,OAAO,EAAE,oBAAoB,EAAE,mBAAmB,EAAE,WAAW,EAAE,MAAM,4BAA4B,CAAC;AAIpG;;;;;;;GAOG;AACH,qBAAa,kBAAmB,SAAQ,oBAAoB;IAExD;;;;;;;OAOG;IACH,gBAAgB,CAAC,MAAM,EAAE,WAAW,GAAG,mBAAmB;IA8G1D,OAAO,CAAC,uBAAuB;IAa/B,OAAO,CAAC,cAAc;IAMtB,OAAO,CAAC,aAAa;CAMxB"}
\ No newline at end of file
diff --git a/lib.commonjs/transaction/coinselector-fewest.js b/lib.commonjs/transaction/coinselector-fewest.js
new file mode 100644
index 00000000..38be7696
--- /dev/null
+++ b/lib.commonjs/transaction/coinselector-fewest.js
@@ -0,0 +1,143 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.FewestCoinSelector = void 0;
+const maths_js_1 = require("../utils/maths.js");
+const abstract_coinselector_js_1 = require("./abstract-coinselector.js");
+const utxo_js_1 = require("./utxo.js");
+/**
+ * The FewestCoinSelector class provides a coin selection algorithm that selects
+ * the fewest UTXOs required to meet the target amount. This algorithm is useful
+ * for minimizing the size of the transaction and the fees associated with it.
+ *
+ * This class is a sub-class of [[AbstractCoinSelector]] and implements the
+ * [[performSelection]] method to provide the actual coin selection logic.
+ */
+class FewestCoinSelector extends abstract_coinselector_js_1.AbstractCoinSelector {
+    /**
+     * The largest first coin selection algorithm.
+     *
+     * This algorithm selects the largest UTXOs first, and continues to select UTXOs until the
+     * target amount is reached. If the total value of the selected UTXOs is greater than the
+     * target amount, the remaining value is returned as a change output.
+     * @param target The target amount to select UTXOs for.
+     */
+    performSelection(target) {
+        this.validateTarget(target);
+        this.validateUTXOs();
+        const sortedUTXOs = this.sortUTXOsByDenomination(this.availableUXTOs, "desc");
+        let totalValue = BigInt(0);
+        let selectedUTXOs = [];
+        // Get UTXOs that meets or exceeds the target value
+        const UTXOsEqualOrGreaterThanTarget = sortedUTXOs.filter(utxo => utxo.denomination && utxo.denomination >= target.value);
+        if (UTXOsEqualOrGreaterThanTarget.length > 0) {
+            // Find the smallest UTXO that meets or exceeds the target value
+            const optimalUTXO = UTXOsEqualOrGreaterThanTarget.reduce((minDenominationUTXO, currentUTXO) => {
+                if (!currentUTXO.denomination)
+                    return minDenominationUTXO;
+                return currentUTXO.denomination < minDenominationUTXO.denomination ? currentUTXO : minDenominationUTXO;
+            }, UTXOsEqualOrGreaterThanTarget[0]); // Initialize with the first UTXO in the list
+            selectedUTXOs.push(optimalUTXO);
+            totalValue += optimalUTXO.denomination;
+        }
+        else {
+            // If no single UTXO meets or exceeds the target, aggregate smaller denominations
+            // until the target is met/exceeded or there are no more UTXOs to aggregate
+            while (sortedUTXOs.length > 0 && totalValue < target.value) {
+                const nextOptimalUTXO = sortedUTXOs.reduce((closest, utxo) => {
+                    if (!utxo.denomination)
+                        return closest;
+                    // Prioritize UTXOs that bring totalValue closer to target.value
+                    const absThisDiff = (0, maths_js_1.bigIntAbs)(target.value - (totalValue + utxo.denomination));
+                    const currentClosestDiff = closest && closest.denomination
+                        ? (0, maths_js_1.bigIntAbs)(target.value - (totalValue + closest.denomination))
+                        : BigInt(Infinity);
+                    return absThisDiff < currentClosestDiff ? utxo : closest;
+                }, sortedUTXOs[0]);
+                // Add the selected UTXO to the selection and update totalValue
+                selectedUTXOs.push(nextOptimalUTXO);
+                totalValue += nextOptimalUTXO.denomination;
+                // Remove the selected UTXO from the list of available UTXOs
+                const index = sortedUTXOs.findIndex(utxo => utxo.denomination === nextOptimalUTXO.denomination && utxo.address === nextOptimalUTXO.address);
+                sortedUTXOs.splice(index, 1);
+            }
+        }
+        // Check if the selected UTXOs meet or exceed the target amount
+        if (totalValue < target.value) {
+            throw new Error("Insufficient funds");
+        }
+        // // Check if any denominations can be removed from the input set and it still remain valid
+        selectedUTXOs = this.sortUTXOsByDenomination(selectedUTXOs, "asc");
+        let runningTotal = totalValue;
+        let lastRemovableIndex = -1; // Index of the last UTXO that can be removed
+        // Iterate through selectedUTXOs to find the last removable UTXO
+        for (let i = 0; i < selectedUTXOs.length; i++) {
+            const utxo = selectedUTXOs[i];
+            if (utxo.denomination) {
+                if (runningTotal - utxo.denomination >= target.value) {
+                    runningTotal -= utxo.denomination;
+                    lastRemovableIndex = i;
+                }
+                else {
+                    // Once a UTXO makes the total less than target.value, stop the loop
+                    break;
+                }
+            }
+        }
+        if (lastRemovableIndex >= 0) {
+            totalValue -= selectedUTXOs[lastRemovableIndex].denomination;
+            selectedUTXOs.splice(lastRemovableIndex, 1);
+        }
+        // Break down the total spend into properly denominatated UTXOs
+        const spendDenominations = (0, utxo_js_1.denominate)(target.value);
+        this.spendOutputs = spendDenominations.map(denomination => {
+            const utxo = new utxo_js_1.UTXO();
+            utxo.denomination = denomination;
+            utxo.address = target.address;
+            return utxo;
+        });
+        // Calculate change to be returned
+        const change = totalValue - target.value;
+        // If there's change, break it down into properly denominatated UTXOs
+        if (change > BigInt(0)) {
+            const changeDenominations = (0, utxo_js_1.denominate)(change);
+            this.changeOutputs = changeDenominations.map(denomination => {
+                const utxo = new utxo_js_1.UTXO();
+                utxo.denomination = denomination;
+                // We do not have access to change addresses here so leave it null
+                return utxo;
+            });
+        }
+        else {
+            this.changeOutputs = [];
+        }
+        return {
+            inputs: selectedUTXOs,
+            spendOutputs: this.spendOutputs,
+            changeOutputs: this.changeOutputs,
+        };
+    }
+    sortUTXOsByDenomination(utxos, direction) {
+        if (direction === "asc") {
+            return [...utxos].sort((a, b) => {
+                const diff = (a.denomination ?? BigInt(0)) - (b.denomination ?? BigInt(0));
+                return diff > 0 ? 1 : diff < 0 ? -1 : 0;
+            });
+        }
+        return [...utxos].sort((a, b) => {
+            const diff = (b.denomination ?? BigInt(0)) - (a.denomination ?? BigInt(0));
+            return diff > 0 ? 1 : diff < 0 ? -1 : 0;
+        });
+    }
+    validateTarget(target) {
+        if (target.value <= BigInt(0)) {
+            throw new Error("Target amount must be greater than 0");
+        }
+    }
+    validateUTXOs() {
+        if (this.availableUXTOs.length === 0) {
+            throw new Error("No UTXOs available");
+        }
+    }
+}
+exports.FewestCoinSelector = FewestCoinSelector;
+//# sourceMappingURL=coinselector-fewest.js.map
\ No newline at end of file
diff --git a/lib.commonjs/transaction/coinselector-fewest.js.map b/lib.commonjs/transaction/coinselector-fewest.js.map
new file mode 100644
index 00000000..e967110d
--- /dev/null
+++ b/lib.commonjs/transaction/coinselector-fewest.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib.commonjs/transaction/utxo.d.ts b/lib.commonjs/transaction/utxo.d.ts
new file mode 100644
index 00000000..7fa6146b
--- /dev/null
+++ b/lib.commonjs/transaction/utxo.d.ts
@@ -0,0 +1,58 @@
+import type { BigNumberish } from "../utils/index";
+export type OutPoint = {
+    txhash: string;
+    index: number;
+};
+export type UTXOTransactionInput = {
+    previousOutPoint: OutPoint;
+    pubKey: Uint8Array;
+};
+export interface UTXOEntry {
+    denomination: null | bigint;
+    address: null | string;
+}
+export type UTXOTransactionOutput = UTXOEntry;
+export type UTXOTransaction = {
+    chainId: bigint;
+    inputs: UTXOTransactionInput[];
+    outputs: UTXOTransactionOutput[];
+    signature?: Uint8Array;
+};
+export interface UTXOLike extends UTXOEntry {
+    txhash?: null | string;
+    index?: null | number;
+}
+export declare const denominations: bigint[];
+/**
+ * Given a value, returns an array of supported denominations that sum to the value.
+ * @param value The value to denominate.
+ * @returns Array of supported denominations that sum to the value.
+ */
+export declare function denominate(value: bigint): bigint[];
+export declare class UTXO implements UTXOLike {
+    #private;
+    get txhash(): null | string;
+    set txhash(value: null | string);
+    get index(): null | number;
+    set index(value: null | number);
+    get address(): null | string;
+    set address(value: null | string);
+    get denomination(): null | bigint;
+    set denomination(value: null | BigNumberish);
+    /**
+     * Constructs a new UTXO instance with null properties.
+     */
+    constructor();
+    /**
+     * Converts the UTXO instance to a JSON object.
+     * @returns A JSON representation of the UTXO instance.
+     */
+    toJSON(): any;
+    /**
+     * Creates a UTXO instance from a UTXOLike object.
+     * @param utxo The UTXOLike object to create the UTXO instance from.
+     * @returns A new UTXO instance.
+     */
+    static from(utxo: UTXOLike): UTXO;
+}
+//# sourceMappingURL=utxo.d.ts.map
\ No newline at end of file
diff --git a/lib.commonjs/transaction/utxo.d.ts.map b/lib.commonjs/transaction/utxo.d.ts.map
new file mode 100644
index 00000000..d22529c2
--- /dev/null
+++ b/lib.commonjs/transaction/utxo.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"utxo.d.ts","sourceRoot":"","sources":["../../src.ts/transaction/utxo.ts"],"names":[],"mappings":"AAEA,OAAO,KAAK,EAAE,YAAY,EAAE,MAAM,gBAAgB,CAAC;AAEnD,MAAM,MAAM,QAAQ,GAAG;IACnB,MAAM,EAAE,MAAM,CAAC;IACf,KAAK,EAAE,MAAM,CAAC;CACjB,CAAC;AAEF,MAAM,MAAM,oBAAoB,GAAG;IAC/B,gBAAgB,EAAE,QAAQ,CAAC;IAC3B,MAAM,EAAE,UAAU,CAAC;CACtB,CAAC;AAEF,MAAM,WAAW,SAAS;IACtB,YAAY,EAAE,IAAI,GAAG,MAAM,CAAC;IAC5B,OAAO,EAAE,IAAI,GAAG,MAAM,CAAC;CAC1B;AAED,MAAM,MAAM,qBAAqB,GAAG,SAAS,CAAC;AAE9C,MAAM,MAAM,eAAe,GAAG;IAC1B,OAAO,EAAE,MAAM,CAAC;IAChB,MAAM,EAAE,oBAAoB,EAAE,CAAC;IAC/B,OAAO,EAAE,qBAAqB,EAAE,CAAC;IACjC,SAAS,CAAC,EAAE,UAAU,CAAC;CAC1B,CAAC;AAEF,MAAM,WAAW,QAAS,SAAQ,SAAS;IACvC,MAAM,CAAC,EAAE,IAAI,GAAG,MAAM,CAAC;IACvB,KAAK,CAAC,EAAE,IAAI,GAAG,MAAM,CAAC;CACzB;AAED,eAAO,MAAM,aAAa,EAAE,MAAM,EAkBjC,CAAC;AAsBF;;;;GAIG;AACH,wBAAgB,UAAU,CAAC,KAAK,EAAE,MAAM,GAAG,MAAM,EAAE,CA0BlD;AAED,qBAAa,IAAK,YAAW,QAAQ;;IAMjC,IAAI,MAAM,IAAI,IAAI,GAAG,MAAM,CAAyB;IACpD,IAAI,MAAM,CAAC,KAAK,EAAE,IAAI,GAAG,MAAM,EAE9B;IAED,IAAI,KAAK,IAAI,IAAI,GAAG,MAAM,CAAwB;IAClD,IAAI,KAAK,CAAC,KAAK,EAAE,IAAI,GAAG,MAAM,EAE7B;IAED,IAAI,OAAO,IAAI,IAAI,GAAG,MAAM,CAA0B;IACtD,IAAI,OAAO,CAAC,KAAK,EAAE,IAAI,GAAG,MAAM,EAE/B;IAED,IAAI,YAAY,IAAI,IAAI,GAAG,MAAM,CAA+B;IAChE,IAAI,YAAY,CAAC,KAAK,EAAE,IAAI,GAAG,YAAY,EAY1C;IAED;;OAEG;;IAQH;;;OAGG;IACH,MAAM,IAAI,GAAG;IASb;;;;OAIG;IACH,MAAM,CAAC,IAAI,CAAC,IAAI,EAAE,QAAQ,GAAG,IAAI;CAWpC"}
\ No newline at end of file
diff --git a/lib.commonjs/transaction/utxo.js b/lib.commonjs/transaction/utxo.js
new file mode 100644
index 00000000..556d6582
--- /dev/null
+++ b/lib.commonjs/transaction/utxo.js
@@ -0,0 +1,148 @@
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+exports.UTXO = exports.denominate = exports.denominations = void 0;
+const index_1 = require("../address/index");
+const index_2 = require("../utils/index");
+;
+exports.denominations = [
+    BigInt(1),
+    BigInt(5),
+    BigInt(10),
+    BigInt(50),
+    BigInt(100),
+    BigInt(250),
+    BigInt(500),
+    BigInt(1000),
+    BigInt(5000),
+    BigInt(10000),
+    BigInt(20000),
+    BigInt(50000),
+    BigInt(100000),
+    BigInt(1000000),
+    BigInt(10000000),
+    BigInt(100000000),
+    BigInt(1000000000), // 1000000 Qi
+];
+/**
+ * Checks if the provided denomination is valid.
+ * @param denomination The denomination to check.
+ * @returns True if the denomination is valid, false otherwise.
+ */
+function isValidDenomination(denomination) {
+    return exports.denominations.includes(denomination);
+}
+/**
+ * Handles conversion of string to bigint, specifically for transaction parameters.
+ * @param value The string value to convert.
+ * @param param The parameter name for error context.
+ * @returns The bigint representation of the input string.
+ */
+function handleBigInt(value, param) {
+    if (value === "0x") {
+        return BigInt(0);
+    }
+    return (0, index_2.getBigInt)(value, param);
+}
+/**
+ * Given a value, returns an array of supported denominations that sum to the value.
+ * @param value The value to denominate.
+ * @returns Array of supported denominations that sum to the value.
+ */
+function denominate(value) {
+    if (value <= BigInt(0)) {
+        throw new Error("Value must be greater than 0");
+    }
+    const result = [];
+    let remainingValue = value;
+    // Iterate through denominations in descending order
+    for (let i = exports.denominations.length - 1; i >= 0; i--) {
+        const denomination = exports.denominations[i];
+        // Add the denomination to the result array as many times as possible
+        while (remainingValue >= denomination) {
+            result.push(denomination);
+            remainingValue -= denomination;
+        }
+    }
+    if (remainingValue > 0) {
+        throw new Error("Unable to match the value with available denominations");
+    }
+    return result;
+}
+exports.denominate = denominate;
+class UTXO {
+    #txhash;
+    #index;
+    #address;
+    #denomination;
+    get txhash() { return this.#txhash; }
+    set txhash(value) {
+        this.#txhash = value;
+    }
+    get index() { return this.#index; }
+    set index(value) {
+        this.#index = value;
+    }
+    get address() { return this.#address; }
+    set address(value) {
+        this.#address = (value == null) ? null : (0, index_1.getAddress)(value);
+    }
+    get denomination() { return this.#denomination; }
+    set denomination(value) {
+        if (value == null) {
+            this.#denomination = null;
+            return;
+        }
+        const denominationBigInt = handleBigInt(value.toString(), "denomination");
+        if (!isValidDenomination(denominationBigInt)) {
+            throw new Error("Invalid denomination value");
+        }
+        this.#denomination = denominationBigInt;
+    }
+    /**
+     * Constructs a new UTXO instance with null properties.
+     */
+    constructor() {
+        this.#txhash = null;
+        this.#index = null;
+        this.#address = null;
+        this.#denomination = null;
+    }
+    /**
+     * Converts the UTXO instance to a JSON object.
+     * @returns A JSON representation of the UTXO instance.
+     */
+    toJSON() {
+        return {
+            txhash: this.txhash,
+            index: this.index,
+            address: this.address,
+            denomination: this.denomination,
+        };
+    }
+    /**
+     * Creates a UTXO instance from a UTXOLike object.
+     * @param utxo The UTXOLike object to create the UTXO instance from.
+     * @returns A new UTXO instance.
+     */
+    static from(utxo) {
+        if (utxo === null) {
+            return new UTXO();
+        }
+        const result = utxo instanceof UTXO ? utxo : new UTXO();
+        if (utxo.txhash != null) {
+            result.txhash = utxo.txhash;
+        }
+        if (utxo.index != null) {
+            result.index = utxo.index;
+        }
+        if (utxo.address != null) {
+            result.address = utxo.address;
+        }
+        if (utxo.denomination != null) {
+            result.denomination = utxo.denomination;
+        }
+        return result;
+    }
+}
+exports.UTXO = UTXO;
+//# sourceMappingURL=utxo.js.map
\ No newline at end of file
diff --git a/lib.commonjs/transaction/utxo.js.map b/lib.commonjs/transaction/utxo.js.map
new file mode 100644
index 00000000..63c3d8fe
--- /dev/null
+++ b/lib.commonjs/transaction/utxo.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"utxo.js","sourceRoot":"","sources":["../../src.ts/transaction/utxo.ts"],"names":[],"mappings":";;;AAAA,4CAA8C;AAC9C,0CAA2C;AAgB1C,CAAC;AAgBW,QAAA,aAAa,GAAa;IACnC,MAAM,CAAC,CAAC,CAAC;IACT,MAAM,CAAC,CAAC,CAAC;IACT,MAAM,CAAC,EAAE,CAAC;IACV,MAAM,CAAC,EAAE,CAAC;IACV,MAAM,CAAC,GAAG,CAAC;IACX,MAAM,CAAC,GAAG,CAAC;IACX,MAAM,CAAC,GAAG,CAAC;IACX,MAAM,CAAC,IAAI,CAAC;IACZ,MAAM,CAAC,IAAI,CAAC;IACZ,MAAM,CAAC,KAAK,CAAC;IACb,MAAM,CAAC,KAAK,CAAC;IACb,MAAM,CAAC,KAAK,CAAC;IACb,MAAM,CAAC,MAAM,CAAC;IACd,MAAM,CAAC,OAAO,CAAC;IACf,MAAM,CAAC,QAAQ,CAAC;IAChB,MAAM,CAAC,SAAS,CAAC;IACjB,MAAM,CAAC,UAAU,CAAC,EAAG,aAAa;CACrC,CAAC;AAEF;;;;GAIG;AACH,SAAS,mBAAmB,CAAC,YAAoB;IAC7C,OAAO,qBAAa,CAAC,QAAQ,CAAC,YAAY,CAAC,CAAC;AAChD,CAAC;AAED;;;;;GAKG;AACH,SAAS,YAAY,CAAC,KAAa,EAAE,KAAa;IAC9C,IAAI,KAAK,KAAK,IAAI,EAAE;QAAE,OAAO,MAAM,CAAC,CAAC,CAAC,CAAC;KAAE;IACzC,OAAO,IAAA,iBAAS,EAAC,KAAK,EAAE,KAAK,CAAC,CAAC;AACnC,CAAC;AAED;;;;GAIG;AACH,SAAgB,UAAU,CAAC,KAAa;IACpC,IAAI,KAAK,IAAI,MAAM,CAAC,CAAC,CAAC,EAAE;QACpB,MAAM,IAAI,KAAK,CAAC,8BAA8B,CAAC,CAAC;KACnD;IAED,MAAM,MAAM,GAAa,EAAE,CAAC;IAC5B,IAAI,cAAc,GAAG,KAAK,CAAC;IAE3B,oDAAoD;IACpD,KAAK,IAAI,CAAC,GAAG,qBAAa,CAAC,MAAM,GAAG,CAAC,EAAE,CAAC,IAAI,CAAC,EAAE,CAAC,EAAE,EAAE;QAChD,MAAM,YAAY,GAAG,qBAAa,CAAC,CAAC,CAAC,CAAC;QAEtC,qEAAqE;QACrE,OAAO,cAAc,IAAI,YAAY,EAAE;YACnC,MAAM,CAAC,IAAI,CAAC,YAAY,CAAC,CAAC;YAC1B,cAAc,IAAI,YAAY,CAAC;SAClC;KACJ;IAED,IAAI,cAAc,GAAG,CAAC,EAAE;QACpB,MAAM,IAAI,KAAK,CAAC,wDAAwD,CAAC,CAAC;KAC7E;IAID,OAAO,MAAM,CAAC;AAClB,CAAC;AA1BD,gCA0BC;AAED,MAAa,IAAI;IACb,OAAO,CAAgB;IACvB,MAAM,CAAgB;IACtB,QAAQ,CAAgB;IACxB,aAAa,CAAgB;IAE7B,IAAI,MAAM,KAAoB,OAAO,IAAI,CAAC,OAAO,CAAC,CAAC,CAAC;IACpD,IAAI,MAAM,CAAC,KAAoB;QAC3B,IAAI,CAAC,OAAO,GAAG,KAAK,CAAC;IACzB,CAAC;IAED,IAAI,KAAK,KAAoB,OAAO,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC;IAClD,IAAI,KAAK,CAAC,KAAoB;QAC1B,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;IACxB,CAAC;IAED,IAAI,OAAO,KAAoB,OAAO,IAAI,CAAC,QAAQ,CAAC,CAAC,CAAC;IACtD,IAAI,OAAO,CAAC,KAAoB;QAC5B,IAAI,CAAC,QAAQ,GAAG,CAAC,KAAK,IAAI,IAAI,CAAC,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,IAAA,kBAAU,EAAC,KAAK,CAAC,CAAC;IAC/D,CAAC;IAED,IAAI,YAAY,KAAoB,OAAO,IAAI,CAAC,aAAa,CAAC,CAAC,CAAC;IAChE,IAAI,YAAY,CAAC,KAA0B;QACvC,IAAI,KAAK,IAAI,IAAI,EAAE;YACf,IAAI,CAAC,aAAa,GAAG,IAAI,CAAC;YAC1B,OAAO;SACV;QAED,MAAM,kBAAkB,GAAG,YAAY,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,cAAc,CAAC,CAAC;QAC1E,IAAI,CAAC,mBAAmB,CAAC,kBAAkB,CAAC,EAAE;YAC1C,MAAM,IAAI,KAAK,CAAC,4BAA4B,CAAC,CAAC;SACjD;QAED,IAAI,CAAC,aAAa,GAAG,kBAAkB,CAAC;IAC5C,CAAC;IAED;;OAEG;IACH;QACI,IAAI,CAAC,OAAO,GAAG,IAAI,CAAC;QACpB,IAAI,CAAC,MAAM,GAAG,IAAI,CAAC;QACnB,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC;QACrB,IAAI,CAAC,aAAa,GAAG,IAAI,CAAC;IAC9B,CAAC;IAED;;;OAGG;IACH,MAAM;QACF,OAAO;YACH,MAAM,EAAE,IAAI,CAAC,MAAM;YACnB,KAAK,EAAE,IAAI,CAAC,KAAK;YACjB,OAAO,EAAE,IAAI,CAAC,OAAO;YACrB,YAAY,EAAE,IAAI,CAAC,YAAY;SAClC,CAAC;IACN,CAAC;IAED;;;;OAIG;IACH,MAAM,CAAC,IAAI,CAAC,IAAc;QACtB,IAAI,IAAI,KAAK,IAAI,EAAE;YAAE,OAAO,IAAI,IAAI,EAAE,CAAC;SAAE;QAEzC,MAAM,MAAM,GAAG,IAAI,YAAY,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,IAAI,IAAI,EAAE,CAAC;QACxD,IAAI,IAAI,CAAC,MAAM,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,MAAM,GAAG,IAAI,CAAC,MAAM,CAAC;SAAE;QACzD,IAAI,IAAI,CAAC,KAAK,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,KAAK,GAAG,IAAI,CAAC,KAAK,CAAC;SAAE;QACtD,IAAI,IAAI,CAAC,OAAO,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,OAAO,GAAG,IAAI,CAAC,OAAO,CAAC;SAAE;QAC5D,IAAI,IAAI,CAAC,YAAY,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,YAAY,GAAG,IAAI,CAAC,YAAY,CAAC;SAAE;QAE3E,OAAO,MAAM,CAAC;IAClB,CAAC;CACJ;AA3ED,oBA2EC"}
\ No newline at end of file
diff --git a/lib.commonjs/utils/maths.d.ts b/lib.commonjs/utils/maths.d.ts
index 661f0dfd..676f5294 100644
--- a/lib.commonjs/utils/maths.d.ts
+++ b/lib.commonjs/utils/maths.d.ts
@@ -30,6 +30,10 @@ export declare function mask(_value: BigNumberish, _bits: Numeric): bigint;
  *  a BigInt, then an ArgumentError will be thrown for %%name%%.
  */
 export declare function getBigInt(value: BigNumberish, name?: string): bigint;
+/**
+ * Returns absolute value of bigint %%value%%.
+ */
+export declare function bigIntAbs(value: BigNumberish): bigint;
 /**
  *  Returns %%value%% as a bigint, validating it is valid as a bigint
  *  value and that it is positive.
diff --git a/lib.commonjs/utils/maths.d.ts.map b/lib.commonjs/utils/maths.d.ts.map
index 626b19a4..f544e6fb 100644
--- a/lib.commonjs/utils/maths.d.ts.map
+++ b/lib.commonjs/utils/maths.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"maths.d.ts","sourceRoot":"","sources":["../../src.ts/utils/maths.ts"],"names":[],"mappings":"AAQA,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,WAAW,CAAC;AAE3C;;GAEG;AACH,MAAM,MAAM,OAAO,GAAG,MAAM,GAAG,MAAM,CAAC;AAEtC;;GAEG;AACH,MAAM,MAAM,YAAY,GAAG,MAAM,GAAG,OAAO,CAAC;AAY5C;;;;;GAKG;AACH,wBAAgB,QAAQ,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAetE;AAED;;;;;GAKG;AACH,wBAAgB,MAAM,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAoBpE;AAED;;GAEG;AACH,wBAAgB,IAAI,CAAC,MAAM,EAAE,YAAY,EAAE,KAAK,EAAE,OAAO,GAAG,MAAM,CAIjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAmBpE;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAMlE;AAQD,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAWjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAkBpE;AAGD;;;GAGG;AACH,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAEjE;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,CAAC,EAAE,OAAO,GAAG,MAAM,CAsBtE;AAED;;GAEG;AACH,wBAAgB,SAAS,CAAC,MAAM,EAAE,YAAY,GAAG,UAAU,CAe1D;AAED;;;;;;GAMG;AACH,wBAAgB,UAAU,CAAC,KAAK,EAAE,SAAS,GAAG,YAAY,GAAG,MAAM,CAKlE"}
\ No newline at end of file
+{"version":3,"file":"maths.d.ts","sourceRoot":"","sources":["../../src.ts/utils/maths.ts"],"names":[],"mappings":"AAQA,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,WAAW,CAAC;AAE3C;;GAEG;AACH,MAAM,MAAM,OAAO,GAAG,MAAM,GAAG,MAAM,CAAC;AAEtC;;GAEG;AACH,MAAM,MAAM,YAAY,GAAG,MAAM,GAAG,OAAO,CAAC;AAY5C;;;;;GAKG;AACH,wBAAgB,QAAQ,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAetE;AAED;;;;;GAKG;AACH,wBAAgB,MAAM,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAoBpE;AAED;;GAEG;AACH,wBAAgB,IAAI,CAAC,MAAM,EAAE,YAAY,EAAE,KAAK,EAAE,OAAO,GAAG,MAAM,CAIjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAmBpE;AAED;;GAEG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,GAAG,MAAM,CAQrD;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAMlE;AAQD,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAWjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAkBpE;AAGD;;;GAGG;AACH,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAEjE;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,CAAC,EAAE,OAAO,GAAG,MAAM,CAsBtE;AAED;;GAEG;AACH,wBAAgB,SAAS,CAAC,MAAM,EAAE,YAAY,GAAG,UAAU,CAe1D;AAED;;;;;;GAMG;AACH,wBAAgB,UAAU,CAAC,KAAK,EAAE,SAAS,GAAG,YAAY,GAAG,MAAM,CAKlE"}
\ No newline at end of file
diff --git a/lib.commonjs/utils/maths.js b/lib.commonjs/utils/maths.js
index 6ceb9fb9..aeb2cc55 100644
--- a/lib.commonjs/utils/maths.js
+++ b/lib.commonjs/utils/maths.js
@@ -1,6 +1,6 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.toQuantity = exports.toBeArray = exports.toBeHex = exports.toNumber = exports.getNumber = exports.toBigInt = exports.getUint = exports.getBigInt = exports.mask = exports.toTwos = exports.fromTwos = void 0;
+exports.toQuantity = exports.toBeArray = exports.toBeHex = exports.toNumber = exports.getNumber = exports.toBigInt = exports.getUint = exports.bigIntAbs = exports.getBigInt = exports.mask = exports.toTwos = exports.fromTwos = void 0;
 /**
  *  Some mathematic operations.
  *
@@ -96,6 +96,18 @@ function getBigInt(value, name) {
     (0, errors_js_1.assertArgument)(false, "invalid BigNumberish value", name || "value", value);
 }
 exports.getBigInt = getBigInt;
+/**
+ * Returns absolute value of bigint %%value%%.
+ */
+function bigIntAbs(value) {
+    value = getBigInt(value);
+    // if value is negative (including -0), return -value, else return value
+    if (value === -BN_0 || value < BN_0) {
+        return -value;
+    }
+    return value;
+}
+exports.bigIntAbs = bigIntAbs;
 /**
  *  Returns %%value%% as a bigint, validating it is valid as a bigint
  *  value and that it is positive.
diff --git a/lib.commonjs/utils/maths.js.map b/lib.commonjs/utils/maths.js.map
index d9d0e2a5..f59e45f3 100644
--- a/lib.commonjs/utils/maths.js.map
+++ b/lib.commonjs/utils/maths.js.map
@@ -1 +1 @@
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\ No newline at end of file
diff --git a/lib.esm/_tests/test-utxo-coinselection.d.ts b/lib.esm/_tests/test-utxo-coinselection.d.ts
new file mode 100644
index 00000000..c1dd221a
--- /dev/null
+++ b/lib.esm/_tests/test-utxo-coinselection.d.ts
@@ -0,0 +1,2 @@
+export {};
+//# sourceMappingURL=test-utxo-coinselection.d.ts.map
\ No newline at end of file
diff --git a/lib.esm/_tests/test-utxo-coinselection.d.ts.map b/lib.esm/_tests/test-utxo-coinselection.d.ts.map
new file mode 100644
index 00000000..a0513c5c
--- /dev/null
+++ b/lib.esm/_tests/test-utxo-coinselection.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"test-utxo-coinselection.d.ts","sourceRoot":"","sources":["../../src.ts/_tests/test-utxo-coinselection.ts"],"names":[],"mappings":""}
\ No newline at end of file
diff --git a/lib.esm/_tests/test-utxo-coinselection.js b/lib.esm/_tests/test-utxo-coinselection.js
new file mode 100644
index 00000000..98879c90
--- /dev/null
+++ b/lib.esm/_tests/test-utxo-coinselection.js
@@ -0,0 +1,98 @@
+import assert from "assert";
+import { FewestCoinSelector } from "../transaction/coinselector-fewest";
+import { denominations } from "../transaction/utxo";
+const TEST_SPEND_ADDRESS = "0x00539bc2CE3eD0FD039c582CB700EF5398bB0491";
+const TEST_RECEIVE_ADDRESS = "0x02b9B1D30B6cCdc7d908B82739ce891463c3FA19";
+// Utility function to create UTXOs (adjust as necessary)
+function createUTXOs(denominations) {
+    return denominations.map(denomination => ({
+        denomination,
+        address: TEST_SPEND_ADDRESS
+    }));
+}
+describe("FewestCoinSelector", function () {
+    describe("Selecting valid UTXOs", function () {
+        it("selects a single UTXO that exactly matches the target amount", function () {
+            const availableUTXOs = createUTXOs([denominations[1], denominations[2], denominations[3]]); // .065 Qi
+            const targetSpend = { value: denominations[3], address: TEST_RECEIVE_ADDRESS }; // .05 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // A single 0.05 Qi UTXO should have been selected
+            assert.strictEqual(result.inputs.length, 1);
+            assert.strictEqual(result.inputs[0].denomination, denominations[3]);
+            // A single new 0.05 Qi UTXO should have been outputed
+            assert.strictEqual(result.spendOutputs.length, 1);
+            assert.strictEqual(result.spendOutputs[0].denomination, denominations[3]);
+            // No change should be returned
+            assert.strictEqual(result.changeOutputs.length, 0);
+        });
+        it("selects multiple UTXOs whose combined value meets the target amount", function () {
+            const availableUTXOs = createUTXOs([denominations[1], denominations[2], denominations[2], denominations[3]]); // .075 Qi
+            const targetSpend = { value: denominations[2] + denominations[3], address: TEST_RECEIVE_ADDRESS }; // .06 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // 2 UTXOs should have been selected for a total of .06 Qi
+            assert.strictEqual(result.inputs.length, 2);
+            const inputValue = result.inputs[0].denomination + result.inputs[1].denomination;
+            assert.strictEqual(inputValue, denominations[2] + denominations[3]);
+            // 2 new UTxOs should have been outputed for a total of .06 Qi
+            assert.strictEqual(result.spendOutputs.length, 2);
+            const spendValue = result.spendOutputs[0].denomination + result.spendOutputs[1].denomination;
+            assert.strictEqual(spendValue, denominations[2] + denominations[3]);
+            // No change should be returned
+            assert.strictEqual(result.changeOutputs.length, 0);
+        });
+        it("selects a single UTXO that is larger than the target amount, ensuring change is correctly calculated", function () {
+            const availableUTXOs = createUTXOs([denominations[2], denominations[4]]); // .11 Qi
+            const targetSpend = { value: denominations[3], address: TEST_RECEIVE_ADDRESS }; // .05 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // A single 0.1 Qi UTXO should have been selected
+            assert.strictEqual(result.inputs.length, 1);
+            assert.strictEqual(result.inputs[0].denomination, denominations[4]);
+            // A single new 0.05 Qi UTXO should have been outputed
+            assert.strictEqual(result.spendOutputs.length, 1);
+            assert.strictEqual(result.spendOutputs[0].denomination, denominations[3]);
+            // 0.05 Qi should be returned in change
+            assert.strictEqual(result.changeOutputs.length, 1);
+            assert.strictEqual(result.changeOutputs[0].denomination, denominations[3]);
+        });
+        it("selects multiple UTXOs where the total exceeds the target amount, ensuring change is correctly calculated", function () {
+            const availableUTXOs = createUTXOs([
+                denominations[2],
+                denominations[4],
+                denominations[4],
+                denominations[4],
+                denominations[5]
+            ]); // .56 Qi
+            const targetSpend = { value: denominations[6], address: TEST_RECEIVE_ADDRESS }; // .5 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+            // 4 UTXOs should have been selected for a total of .55 Qi
+            assert.strictEqual(result.inputs.length, 4);
+            const inputValue = result.inputs[0].denomination + result.inputs[1].denomination + result.inputs[2].denomination + result.inputs[3].denomination;
+            assert.strictEqual(inputValue, denominations[4] + denominations[4] + denominations[4] + denominations[5]);
+            // A single new 0.5 Qi UTXO should have been outputed 
+            assert.strictEqual(result.spendOutputs.length, 1);
+            assert.strictEqual(result.spendOutputs[0].denomination, denominations[6]);
+            // 0.05 Qi should be returned in change
+            assert.strictEqual(result.changeOutputs.length, 1);
+            assert.strictEqual(result.changeOutputs[0].denomination, denominations[3]);
+        });
+    });
+    describe("Selecting valid UTXOs", function () {
+        it("throws an error when there are insufficient funds", function () {
+            const selector = new FewestCoinSelector(createUTXOs([denominations[0], denominations[0]]));
+            assert.throws(() => selector.performSelection({ value: denominations[3], address: TEST_RECEIVE_ADDRESS }), /Insufficient funds/);
+        });
+        it("throws an error when no UTXOs are available", function () {
+            const selector = new FewestCoinSelector([]);
+            assert.throws(() => selector.performSelection({ value: denominations[2], address: TEST_RECEIVE_ADDRESS }), /No UTXOs available/);
+        });
+        it("throws an error when the target amount is negative", function () {
+            const selector = new FewestCoinSelector(createUTXOs([denominations[2], denominations[2]]));
+            assert.throws(() => selector.performSelection({ value: -denominations[1], address: TEST_RECEIVE_ADDRESS }), /Target amount must be greater than 0/);
+        });
+    });
+});
+//# sourceMappingURL=test-utxo-coinselection.js.map
\ No newline at end of file
diff --git a/lib.esm/_tests/test-utxo-coinselection.js.map b/lib.esm/_tests/test-utxo-coinselection.js.map
new file mode 100644
index 00000000..0c56d7cb
--- /dev/null
+++ b/lib.esm/_tests/test-utxo-coinselection.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib.esm/transaction/abstract-coinselector.d.ts b/lib.esm/transaction/abstract-coinselector.d.ts
new file mode 100644
index 00000000..1e73fa8c
--- /dev/null
+++ b/lib.esm/transaction/abstract-coinselector.d.ts
@@ -0,0 +1,50 @@
+import { UTXO, UTXOLike } from "./utxo.js";
+export type SpendTarget = {
+    address: string;
+    value: bigint;
+};
+export type SelectedCoinsResult = {
+    inputs: UTXO[];
+    spendOutputs: UTXO[];
+    changeOutputs: UTXO[];
+};
+/**
+ * An **AbstractCoinSelector** provides a base class for other sub-classes to
+ * implement the functionality for selecting UTXOs for a spend and to properly
+ * handle spend and change outputs.
+ *
+ * This class is abstract and should not be used directly. Sub-classes should
+ * implement the [[performSelection]] method to provide the actual coin
+ * selection logic.
+ *
+ * @abstract
+ */
+export declare abstract class AbstractCoinSelector {
+    #private;
+    get availableUXTOs(): UTXO[];
+    set availableUXTOs(value: UTXOLike[]);
+    get spendOutputs(): UTXO[];
+    set spendOutputs(value: UTXOLike[]);
+    get changeOutputs(): UTXO[];
+    set changeOutputs(value: UTXOLike[]);
+    /**
+     * Constructs a new AbstractCoinSelector instance with an empty UTXO array.
+     */
+    constructor(availableUXTOs?: UTXOLike[]);
+    /**
+     * This method should be implemented by sub-classes to provide the actual
+     * coin selection logic. It should select UTXOs from the available UTXOs
+     * that sum to the target amount and return the selected UTXOs as well as
+     * the spend and change outputs.
+     * @param target The target amount to select UTXOs for.
+     */
+    abstract performSelection(target: SpendTarget): SelectedCoinsResult;
+    /**
+     * Validates the provided UTXO instance. In order to be valid for coin
+     * selection, the UTXO must have a valid address and denomination.
+     * @param utxo The UTXO instance to validate.
+     * @throws An error if the UTXO instance is invalid.
+     */
+    protected _validateUTXO(utxo: UTXO): void;
+}
+//# sourceMappingURL=abstract-coinselector.d.ts.map
\ No newline at end of file
diff --git a/lib.esm/transaction/abstract-coinselector.d.ts.map b/lib.esm/transaction/abstract-coinselector.d.ts.map
new file mode 100644
index 00000000..c207e70d
--- /dev/null
+++ b/lib.esm/transaction/abstract-coinselector.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"abstract-coinselector.d.ts","sourceRoot":"","sources":["../../src.ts/transaction/abstract-coinselector.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,IAAI,EAAE,QAAQ,EAAE,MAAM,WAAW,CAAC;AAE3C,MAAM,MAAM,WAAW,GAAG;IACtB,OAAO,EAAE,MAAM,CAAC;IAChB,KAAK,EAAE,MAAM,CAAC;CACjB,CAAC;AAEF,MAAM,MAAM,mBAAmB,GAAG;IAC9B,MAAM,EAAE,IAAI,EAAE,CAAC;IACf,YAAY,EAAE,IAAI,EAAE,CAAC;IACrB,aAAa,EAAE,IAAI,EAAE,CAAC;CACzB,CAAC;AAEF;;;;;;;;;;GAUG;AACH,8BAAsB,oBAAoB;;IAKtC,IAAI,cAAc,IAAI,IAAI,EAAE,CAAiC;IAC7D,IAAI,cAAc,CAAC,KAAK,EAAE,QAAQ,EAAE,EAMnC;IAED,IAAI,YAAY,IAAI,IAAI,EAAE,CAA+B;IACzD,IAAI,YAAY,CAAC,KAAK,EAAE,QAAQ,EAAE,EAEjC;IAED,IAAI,aAAa,IAAI,IAAI,EAAE,CAAgC;IAC3D,IAAI,aAAa,CAAC,KAAK,EAAE,QAAQ,EAAE,EAElC;IAED;;OAEG;gBACS,cAAc,GAAE,QAAQ,EAAO;IAU3C;;;;;;OAMG;IACH,QAAQ,CAAC,gBAAgB,CAAC,MAAM,EAAE,WAAW,GAAG,mBAAmB;IAEnE;;;;;OAKG;IACH,SAAS,CAAC,aAAa,CAAC,IAAI,EAAE,IAAI,GAAG,IAAI;CAY5C"}
\ No newline at end of file
diff --git a/lib.esm/transaction/abstract-coinselector.js b/lib.esm/transaction/abstract-coinselector.js
new file mode 100644
index 00000000..a3c8dc34
--- /dev/null
+++ b/lib.esm/transaction/abstract-coinselector.js
@@ -0,0 +1,60 @@
+import { UTXO } from "./utxo.js";
+/**
+ * An **AbstractCoinSelector** provides a base class for other sub-classes to
+ * implement the functionality for selecting UTXOs for a spend and to properly
+ * handle spend and change outputs.
+ *
+ * This class is abstract and should not be used directly. Sub-classes should
+ * implement the [[performSelection]] method to provide the actual coin
+ * selection logic.
+ *
+ * @abstract
+ */
+export class AbstractCoinSelector {
+    #availableUXTOs;
+    #spendOutputs;
+    #changeOutputs;
+    get availableUXTOs() { return this.#availableUXTOs; }
+    set availableUXTOs(value) {
+        this.#availableUXTOs = value.map((val) => {
+            const utxo = UTXO.from(val);
+            this._validateUTXO(utxo);
+            return utxo;
+        });
+    }
+    get spendOutputs() { return this.#spendOutputs; }
+    set spendOutputs(value) {
+        this.#spendOutputs = value.map((utxo) => UTXO.from(utxo));
+    }
+    get changeOutputs() { return this.#changeOutputs; }
+    set changeOutputs(value) {
+        this.#changeOutputs = value.map((utxo) => UTXO.from(utxo));
+    }
+    /**
+     * Constructs a new AbstractCoinSelector instance with an empty UTXO array.
+     */
+    constructor(availableUXTOs = []) {
+        this.#availableUXTOs = availableUXTOs.map((val) => {
+            const utxo = UTXO.from(val);
+            this._validateUTXO(utxo);
+            return utxo;
+        });
+        this.#spendOutputs = [];
+        this.#changeOutputs = [];
+    }
+    /**
+     * Validates the provided UTXO instance. In order to be valid for coin
+     * selection, the UTXO must have a valid address and denomination.
+     * @param utxo The UTXO instance to validate.
+     * @throws An error if the UTXO instance is invalid.
+     */
+    _validateUTXO(utxo) {
+        if (utxo.address == null) {
+            throw new Error("UTXO address is required");
+        }
+        if (utxo.denomination == null) {
+            throw new Error("UTXO denomination is required");
+        }
+    }
+}
+//# sourceMappingURL=abstract-coinselector.js.map
\ No newline at end of file
diff --git a/lib.esm/transaction/abstract-coinselector.js.map b/lib.esm/transaction/abstract-coinselector.js.map
new file mode 100644
index 00000000..1736d803
--- /dev/null
+++ b/lib.esm/transaction/abstract-coinselector.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"abstract-coinselector.js","sourceRoot":"","sources":["../../src.ts/transaction/abstract-coinselector.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,IAAI,EAAY,MAAM,WAAW,CAAC;AAa3C;;;;;;;;;;GAUG;AACH,MAAM,OAAgB,oBAAoB;IACtC,eAAe,CAAS;IACxB,aAAa,CAAS;IACtB,cAAc,CAAS;IAEvB,IAAI,cAAc,KAAa,OAAO,IAAI,CAAC,eAAe,CAAC,CAAC,CAAC;IAC7D,IAAI,cAAc,CAAC,KAAiB;QAChC,IAAI,CAAC,eAAe,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,GAAa,EAAE,EAAE;YAC/C,MAAM,IAAI,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;YAC5B,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,CAAC;YACzB,OAAO,IAAI,CAAC;QAChB,CAAC,CAAC,CAAC;IACP,CAAC;IAED,IAAI,YAAY,KAAa,OAAO,IAAI,CAAC,aAAa,CAAC,CAAC,CAAC;IACzD,IAAI,YAAY,CAAC,KAAiB;QAC9B,IAAI,CAAC,aAAa,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,IAAc,EAAE,EAAE,CAAC,IAAI,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC;IACxE,CAAC;IAED,IAAI,aAAa,KAAa,OAAO,IAAI,CAAC,cAAc,CAAC,CAAC,CAAC;IAC3D,IAAI,aAAa,CAAC,KAAiB;QAC/B,IAAI,CAAC,cAAc,GAAG,KAAK,CAAC,GAAG,CAAC,CAAC,IAAc,EAAE,EAAE,CAAC,IAAI,CAAC,IAAI,CAAC,IAAI,CAAC,CAAC,CAAC;IACzE,CAAC;IAED;;OAEG;IACH,YAAY,iBAA6B,EAAE;QACvC,IAAI,CAAC,eAAe,GAAG,cAAc,CAAC,GAAG,CAAC,CAAC,GAAa,EAAE,EAAE;YACxD,MAAM,IAAI,GAAG,IAAI,CAAC,IAAI,CAAC,GAAG,CAAC,CAAC;YAC5B,IAAI,CAAC,aAAa,CAAC,IAAI,CAAC,CAAC;YACzB,OAAO,IAAI,CAAC;QAChB,CAAC,CAAC,CAAC;QACH,IAAI,CAAC,aAAa,GAAG,EAAE,CAAC;QACxB,IAAI,CAAC,cAAc,GAAG,EAAE,CAAC;IAC7B,CAAC;IAWD;;;;;OAKG;IACO,aAAa,CAAC,IAAU;QAC9B,IAAI,IAAI,CAAC,OAAO,IAAI,IAAI,EAAE;YACtB,MAAM,IAAI,KAAK,CAAC,0BAA0B,CAAC,CAAC;SAC/C;QAED,IAAI,IAAI,CAAC,YAAY,IAAI,IAAI,EAAE;YAC3B,MAAM,IAAI,KAAK,CAAC,+BAA+B,CAAC,CAAC;SACpD;IACL,CAAC;CAIJ"}
\ No newline at end of file
diff --git a/lib.esm/transaction/coinselector-fewest.d.ts b/lib.esm/transaction/coinselector-fewest.d.ts
new file mode 100644
index 00000000..8b597438
--- /dev/null
+++ b/lib.esm/transaction/coinselector-fewest.d.ts
@@ -0,0 +1,24 @@
+import { AbstractCoinSelector, SelectedCoinsResult, SpendTarget } from "./abstract-coinselector.js";
+/**
+ * The FewestCoinSelector class provides a coin selection algorithm that selects
+ * the fewest UTXOs required to meet the target amount. This algorithm is useful
+ * for minimizing the size of the transaction and the fees associated with it.
+ *
+ * This class is a sub-class of [[AbstractCoinSelector]] and implements the
+ * [[performSelection]] method to provide the actual coin selection logic.
+ */
+export declare class FewestCoinSelector extends AbstractCoinSelector {
+    /**
+     * The largest first coin selection algorithm.
+     *
+     * This algorithm selects the largest UTXOs first, and continues to select UTXOs until the
+     * target amount is reached. If the total value of the selected UTXOs is greater than the
+     * target amount, the remaining value is returned as a change output.
+     * @param target The target amount to select UTXOs for.
+     */
+    performSelection(target: SpendTarget): SelectedCoinsResult;
+    private sortUTXOsByDenomination;
+    private validateTarget;
+    private validateUTXOs;
+}
+//# sourceMappingURL=coinselector-fewest.d.ts.map
\ No newline at end of file
diff --git a/lib.esm/transaction/coinselector-fewest.d.ts.map b/lib.esm/transaction/coinselector-fewest.d.ts.map
new file mode 100644
index 00000000..d6100187
--- /dev/null
+++ b/lib.esm/transaction/coinselector-fewest.d.ts.map
@@ -0,0 +1 @@
+{"version":3,"file":"coinselector-fewest.d.ts","sourceRoot":"","sources":["../../src.ts/transaction/coinselector-fewest.ts"],"names":[],"mappings":"AACA,OAAO,EAAE,oBAAoB,EAAE,mBAAmB,EAAE,WAAW,EAAE,MAAM,4BAA4B,CAAC;AAIpG;;;;;;;GAOG;AACH,qBAAa,kBAAmB,SAAQ,oBAAoB;IAExD;;;;;;;OAOG;IACH,gBAAgB,CAAC,MAAM,EAAE,WAAW,GAAG,mBAAmB;IA8G1D,OAAO,CAAC,uBAAuB;IAa/B,OAAO,CAAC,cAAc;IAMtB,OAAO,CAAC,aAAa;CAMxB"}
\ No newline at end of file
diff --git a/lib.esm/transaction/coinselector-fewest.js b/lib.esm/transaction/coinselector-fewest.js
new file mode 100644
index 00000000..b76a92a0
--- /dev/null
+++ b/lib.esm/transaction/coinselector-fewest.js
@@ -0,0 +1,139 @@
+import { bigIntAbs } from "../utils/maths.js";
+import { AbstractCoinSelector } from "./abstract-coinselector.js";
+import { UTXO, denominate } from "./utxo.js";
+/**
+ * The FewestCoinSelector class provides a coin selection algorithm that selects
+ * the fewest UTXOs required to meet the target amount. This algorithm is useful
+ * for minimizing the size of the transaction and the fees associated with it.
+ *
+ * This class is a sub-class of [[AbstractCoinSelector]] and implements the
+ * [[performSelection]] method to provide the actual coin selection logic.
+ */
+export class FewestCoinSelector extends AbstractCoinSelector {
+    /**
+     * The largest first coin selection algorithm.
+     *
+     * This algorithm selects the largest UTXOs first, and continues to select UTXOs until the
+     * target amount is reached. If the total value of the selected UTXOs is greater than the
+     * target amount, the remaining value is returned as a change output.
+     * @param target The target amount to select UTXOs for.
+     */
+    performSelection(target) {
+        this.validateTarget(target);
+        this.validateUTXOs();
+        const sortedUTXOs = this.sortUTXOsByDenomination(this.availableUXTOs, "desc");
+        let totalValue = BigInt(0);
+        let selectedUTXOs = [];
+        // Get UTXOs that meets or exceeds the target value
+        const UTXOsEqualOrGreaterThanTarget = sortedUTXOs.filter(utxo => utxo.denomination && utxo.denomination >= target.value);
+        if (UTXOsEqualOrGreaterThanTarget.length > 0) {
+            // Find the smallest UTXO that meets or exceeds the target value
+            const optimalUTXO = UTXOsEqualOrGreaterThanTarget.reduce((minDenominationUTXO, currentUTXO) => {
+                if (!currentUTXO.denomination)
+                    return minDenominationUTXO;
+                return currentUTXO.denomination < minDenominationUTXO.denomination ? currentUTXO : minDenominationUTXO;
+            }, UTXOsEqualOrGreaterThanTarget[0]); // Initialize with the first UTXO in the list
+            selectedUTXOs.push(optimalUTXO);
+            totalValue += optimalUTXO.denomination;
+        }
+        else {
+            // If no single UTXO meets or exceeds the target, aggregate smaller denominations
+            // until the target is met/exceeded or there are no more UTXOs to aggregate
+            while (sortedUTXOs.length > 0 && totalValue < target.value) {
+                const nextOptimalUTXO = sortedUTXOs.reduce((closest, utxo) => {
+                    if (!utxo.denomination)
+                        return closest;
+                    // Prioritize UTXOs that bring totalValue closer to target.value
+                    const absThisDiff = bigIntAbs(target.value - (totalValue + utxo.denomination));
+                    const currentClosestDiff = closest && closest.denomination
+                        ? bigIntAbs(target.value - (totalValue + closest.denomination))
+                        : BigInt(Infinity);
+                    return absThisDiff < currentClosestDiff ? utxo : closest;
+                }, sortedUTXOs[0]);
+                // Add the selected UTXO to the selection and update totalValue
+                selectedUTXOs.push(nextOptimalUTXO);
+                totalValue += nextOptimalUTXO.denomination;
+                // Remove the selected UTXO from the list of available UTXOs
+                const index = sortedUTXOs.findIndex(utxo => utxo.denomination === nextOptimalUTXO.denomination && utxo.address === nextOptimalUTXO.address);
+                sortedUTXOs.splice(index, 1);
+            }
+        }
+        // Check if the selected UTXOs meet or exceed the target amount
+        if (totalValue < target.value) {
+            throw new Error("Insufficient funds");
+        }
+        // // Check if any denominations can be removed from the input set and it still remain valid
+        selectedUTXOs = this.sortUTXOsByDenomination(selectedUTXOs, "asc");
+        let runningTotal = totalValue;
+        let lastRemovableIndex = -1; // Index of the last UTXO that can be removed
+        // Iterate through selectedUTXOs to find the last removable UTXO
+        for (let i = 0; i < selectedUTXOs.length; i++) {
+            const utxo = selectedUTXOs[i];
+            if (utxo.denomination) {
+                if (runningTotal - utxo.denomination >= target.value) {
+                    runningTotal -= utxo.denomination;
+                    lastRemovableIndex = i;
+                }
+                else {
+                    // Once a UTXO makes the total less than target.value, stop the loop
+                    break;
+                }
+            }
+        }
+        if (lastRemovableIndex >= 0) {
+            totalValue -= selectedUTXOs[lastRemovableIndex].denomination;
+            selectedUTXOs.splice(lastRemovableIndex, 1);
+        }
+        // Break down the total spend into properly denominatated UTXOs
+        const spendDenominations = denominate(target.value);
+        this.spendOutputs = spendDenominations.map(denomination => {
+            const utxo = new UTXO();
+            utxo.denomination = denomination;
+            utxo.address = target.address;
+            return utxo;
+        });
+        // Calculate change to be returned
+        const change = totalValue - target.value;
+        // If there's change, break it down into properly denominatated UTXOs
+        if (change > BigInt(0)) {
+            const changeDenominations = denominate(change);
+            this.changeOutputs = changeDenominations.map(denomination => {
+                const utxo = new UTXO();
+                utxo.denomination = denomination;
+                // We do not have access to change addresses here so leave it null
+                return utxo;
+            });
+        }
+        else {
+            this.changeOutputs = [];
+        }
+        return {
+            inputs: selectedUTXOs,
+            spendOutputs: this.spendOutputs,
+            changeOutputs: this.changeOutputs,
+        };
+    }
+    sortUTXOsByDenomination(utxos, direction) {
+        if (direction === "asc") {
+            return [...utxos].sort((a, b) => {
+                const diff = (a.denomination ?? BigInt(0)) - (b.denomination ?? BigInt(0));
+                return diff > 0 ? 1 : diff < 0 ? -1 : 0;
+            });
+        }
+        return [...utxos].sort((a, b) => {
+            const diff = (b.denomination ?? BigInt(0)) - (a.denomination ?? BigInt(0));
+            return diff > 0 ? 1 : diff < 0 ? -1 : 0;
+        });
+    }
+    validateTarget(target) {
+        if (target.value <= BigInt(0)) {
+            throw new Error("Target amount must be greater than 0");
+        }
+    }
+    validateUTXOs() {
+        if (this.availableUXTOs.length === 0) {
+            throw new Error("No UTXOs available");
+        }
+    }
+}
+//# sourceMappingURL=coinselector-fewest.js.map
\ No newline at end of file
diff --git a/lib.esm/transaction/coinselector-fewest.js.map b/lib.esm/transaction/coinselector-fewest.js.map
new file mode 100644
index 00000000..bcb304f2
--- /dev/null
+++ b/lib.esm/transaction/coinselector-fewest.js.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib.esm/transaction/utxo.d.ts b/lib.esm/transaction/utxo.d.ts
new file mode 100644
index 00000000..7fa6146b
--- /dev/null
+++ b/lib.esm/transaction/utxo.d.ts
@@ -0,0 +1,58 @@
+import type { BigNumberish } from "../utils/index";
+export type OutPoint = {
+    txhash: string;
+    index: number;
+};
+export type UTXOTransactionInput = {
+    previousOutPoint: OutPoint;
+    pubKey: Uint8Array;
+};
+export interface UTXOEntry {
+    denomination: null | bigint;
+    address: null | string;
+}
+export type UTXOTransactionOutput = UTXOEntry;
+export type UTXOTransaction = {
+    chainId: bigint;
+    inputs: UTXOTransactionInput[];
+    outputs: UTXOTransactionOutput[];
+    signature?: Uint8Array;
+};
+export interface UTXOLike extends UTXOEntry {
+    txhash?: null | string;
+    index?: null | number;
+}
+export declare const denominations: bigint[];
+/**
+ * Given a value, returns an array of supported denominations that sum to the value.
+ * @param value The value to denominate.
+ * @returns Array of supported denominations that sum to the value.
+ */
+export declare function denominate(value: bigint): bigint[];
+export declare class UTXO implements UTXOLike {
+    #private;
+    get txhash(): null | string;
+    set txhash(value: null | string);
+    get index(): null | number;
+    set index(value: null | number);
+    get address(): null | string;
+    set address(value: null | string);
+    get denomination(): null | bigint;
+    set denomination(value: null | BigNumberish);
+    /**
+     * Constructs a new UTXO instance with null properties.
+     */
+    constructor();
+    /**
+     * Converts the UTXO instance to a JSON object.
+     * @returns A JSON representation of the UTXO instance.
+     */
+    toJSON(): any;
+    /**
+     * Creates a UTXO instance from a UTXOLike object.
+     * @param utxo The UTXOLike object to create the UTXO instance from.
+     * @returns A new UTXO instance.
+     */
+    static from(utxo: UTXOLike): UTXO;
+}
+//# sourceMappingURL=utxo.d.ts.map
\ No newline at end of file
diff --git a/lib.esm/transaction/utxo.d.ts.map b/lib.esm/transaction/utxo.d.ts.map
new file mode 100644
index 00000000..d22529c2
--- /dev/null
+++ b/lib.esm/transaction/utxo.d.ts.map
@@ -0,0 +1 @@
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\ No newline at end of file
diff --git a/lib.esm/transaction/utxo.js b/lib.esm/transaction/utxo.js
new file mode 100644
index 00000000..9faf735f
--- /dev/null
+++ b/lib.esm/transaction/utxo.js
@@ -0,0 +1,143 @@
+import { getAddress } from "../address/index";
+import { getBigInt } from "../utils/index";
+;
+export const denominations = [
+    BigInt(1),
+    BigInt(5),
+    BigInt(10),
+    BigInt(50),
+    BigInt(100),
+    BigInt(250),
+    BigInt(500),
+    BigInt(1000),
+    BigInt(5000),
+    BigInt(10000),
+    BigInt(20000),
+    BigInt(50000),
+    BigInt(100000),
+    BigInt(1000000),
+    BigInt(10000000),
+    BigInt(100000000),
+    BigInt(1000000000), // 1000000 Qi
+];
+/**
+ * Checks if the provided denomination is valid.
+ * @param denomination The denomination to check.
+ * @returns True if the denomination is valid, false otherwise.
+ */
+function isValidDenomination(denomination) {
+    return denominations.includes(denomination);
+}
+/**
+ * Handles conversion of string to bigint, specifically for transaction parameters.
+ * @param value The string value to convert.
+ * @param param The parameter name for error context.
+ * @returns The bigint representation of the input string.
+ */
+function handleBigInt(value, param) {
+    if (value === "0x") {
+        return BigInt(0);
+    }
+    return getBigInt(value, param);
+}
+/**
+ * Given a value, returns an array of supported denominations that sum to the value.
+ * @param value The value to denominate.
+ * @returns Array of supported denominations that sum to the value.
+ */
+export function denominate(value) {
+    if (value <= BigInt(0)) {
+        throw new Error("Value must be greater than 0");
+    }
+    const result = [];
+    let remainingValue = value;
+    // Iterate through denominations in descending order
+    for (let i = denominations.length - 1; i >= 0; i--) {
+        const denomination = denominations[i];
+        // Add the denomination to the result array as many times as possible
+        while (remainingValue >= denomination) {
+            result.push(denomination);
+            remainingValue -= denomination;
+        }
+    }
+    if (remainingValue > 0) {
+        throw new Error("Unable to match the value with available denominations");
+    }
+    return result;
+}
+export class UTXO {
+    #txhash;
+    #index;
+    #address;
+    #denomination;
+    get txhash() { return this.#txhash; }
+    set txhash(value) {
+        this.#txhash = value;
+    }
+    get index() { return this.#index; }
+    set index(value) {
+        this.#index = value;
+    }
+    get address() { return this.#address; }
+    set address(value) {
+        this.#address = (value == null) ? null : getAddress(value);
+    }
+    get denomination() { return this.#denomination; }
+    set denomination(value) {
+        if (value == null) {
+            this.#denomination = null;
+            return;
+        }
+        const denominationBigInt = handleBigInt(value.toString(), "denomination");
+        if (!isValidDenomination(denominationBigInt)) {
+            throw new Error("Invalid denomination value");
+        }
+        this.#denomination = denominationBigInt;
+    }
+    /**
+     * Constructs a new UTXO instance with null properties.
+     */
+    constructor() {
+        this.#txhash = null;
+        this.#index = null;
+        this.#address = null;
+        this.#denomination = null;
+    }
+    /**
+     * Converts the UTXO instance to a JSON object.
+     * @returns A JSON representation of the UTXO instance.
+     */
+    toJSON() {
+        return {
+            txhash: this.txhash,
+            index: this.index,
+            address: this.address,
+            denomination: this.denomination,
+        };
+    }
+    /**
+     * Creates a UTXO instance from a UTXOLike object.
+     * @param utxo The UTXOLike object to create the UTXO instance from.
+     * @returns A new UTXO instance.
+     */
+    static from(utxo) {
+        if (utxo === null) {
+            return new UTXO();
+        }
+        const result = utxo instanceof UTXO ? utxo : new UTXO();
+        if (utxo.txhash != null) {
+            result.txhash = utxo.txhash;
+        }
+        if (utxo.index != null) {
+            result.index = utxo.index;
+        }
+        if (utxo.address != null) {
+            result.address = utxo.address;
+        }
+        if (utxo.denomination != null) {
+            result.denomination = utxo.denomination;
+        }
+        return result;
+    }
+}
+//# sourceMappingURL=utxo.js.map
\ No newline at end of file
diff --git a/lib.esm/transaction/utxo.js.map b/lib.esm/transaction/utxo.js.map
new file mode 100644
index 00000000..3a3d55bc
--- /dev/null
+++ b/lib.esm/transaction/utxo.js.map
@@ -0,0 +1 @@
+{"version":3,"file":"utxo.js","sourceRoot":"","sources":["../../src.ts/transaction/utxo.ts"],"names":[],"mappings":"AAAA,OAAO,EAAE,UAAU,EAAE,MAAM,kBAAkB,CAAC;AAC9C,OAAO,EAAE,SAAS,EAAE,MAAM,gBAAgB,CAAC;AAgB1C,CAAC;AAgBF,MAAM,CAAC,MAAM,aAAa,GAAa;IACnC,MAAM,CAAC,CAAC,CAAC;IACT,MAAM,CAAC,CAAC,CAAC;IACT,MAAM,CAAC,EAAE,CAAC;IACV,MAAM,CAAC,EAAE,CAAC;IACV,MAAM,CAAC,GAAG,CAAC;IACX,MAAM,CAAC,GAAG,CAAC;IACX,MAAM,CAAC,GAAG,CAAC;IACX,MAAM,CAAC,IAAI,CAAC;IACZ,MAAM,CAAC,IAAI,CAAC;IACZ,MAAM,CAAC,KAAK,CAAC;IACb,MAAM,CAAC,KAAK,CAAC;IACb,MAAM,CAAC,KAAK,CAAC;IACb,MAAM,CAAC,MAAM,CAAC;IACd,MAAM,CAAC,OAAO,CAAC;IACf,MAAM,CAAC,QAAQ,CAAC;IAChB,MAAM,CAAC,SAAS,CAAC;IACjB,MAAM,CAAC,UAAU,CAAC,EAAG,aAAa;CACrC,CAAC;AAEF;;;;GAIG;AACH,SAAS,mBAAmB,CAAC,YAAoB;IAC7C,OAAO,aAAa,CAAC,QAAQ,CAAC,YAAY,CAAC,CAAC;AAChD,CAAC;AAED;;;;;GAKG;AACH,SAAS,YAAY,CAAC,KAAa,EAAE,KAAa;IAC9C,IAAI,KAAK,KAAK,IAAI,EAAE;QAAE,OAAO,MAAM,CAAC,CAAC,CAAC,CAAC;KAAE;IACzC,OAAO,SAAS,CAAC,KAAK,EAAE,KAAK,CAAC,CAAC;AACnC,CAAC;AAED;;;;GAIG;AACH,MAAM,UAAU,UAAU,CAAC,KAAa;IACpC,IAAI,KAAK,IAAI,MAAM,CAAC,CAAC,CAAC,EAAE;QACpB,MAAM,IAAI,KAAK,CAAC,8BAA8B,CAAC,CAAC;KACnD;IAED,MAAM,MAAM,GAAa,EAAE,CAAC;IAC5B,IAAI,cAAc,GAAG,KAAK,CAAC;IAE3B,oDAAoD;IACpD,KAAK,IAAI,CAAC,GAAG,aAAa,CAAC,MAAM,GAAG,CAAC,EAAE,CAAC,IAAI,CAAC,EAAE,CAAC,EAAE,EAAE;QAChD,MAAM,YAAY,GAAG,aAAa,CAAC,CAAC,CAAC,CAAC;QAEtC,qEAAqE;QACrE,OAAO,cAAc,IAAI,YAAY,EAAE;YACnC,MAAM,CAAC,IAAI,CAAC,YAAY,CAAC,CAAC;YAC1B,cAAc,IAAI,YAAY,CAAC;SAClC;KACJ;IAED,IAAI,cAAc,GAAG,CAAC,EAAE;QACpB,MAAM,IAAI,KAAK,CAAC,wDAAwD,CAAC,CAAC;KAC7E;IAID,OAAO,MAAM,CAAC;AAClB,CAAC;AAED,MAAM,OAAO,IAAI;IACb,OAAO,CAAgB;IACvB,MAAM,CAAgB;IACtB,QAAQ,CAAgB;IACxB,aAAa,CAAgB;IAE7B,IAAI,MAAM,KAAoB,OAAO,IAAI,CAAC,OAAO,CAAC,CAAC,CAAC;IACpD,IAAI,MAAM,CAAC,KAAoB;QAC3B,IAAI,CAAC,OAAO,GAAG,KAAK,CAAC;IACzB,CAAC;IAED,IAAI,KAAK,KAAoB,OAAO,IAAI,CAAC,MAAM,CAAC,CAAC,CAAC;IAClD,IAAI,KAAK,CAAC,KAAoB;QAC1B,IAAI,CAAC,MAAM,GAAG,KAAK,CAAC;IACxB,CAAC;IAED,IAAI,OAAO,KAAoB,OAAO,IAAI,CAAC,QAAQ,CAAC,CAAC,CAAC;IACtD,IAAI,OAAO,CAAC,KAAoB;QAC5B,IAAI,CAAC,QAAQ,GAAG,CAAC,KAAK,IAAI,IAAI,CAAC,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,UAAU,CAAC,KAAK,CAAC,CAAC;IAC/D,CAAC;IAED,IAAI,YAAY,KAAoB,OAAO,IAAI,CAAC,aAAa,CAAC,CAAC,CAAC;IAChE,IAAI,YAAY,CAAC,KAA0B;QACvC,IAAI,KAAK,IAAI,IAAI,EAAE;YACf,IAAI,CAAC,aAAa,GAAG,IAAI,CAAC;YAC1B,OAAO;SACV;QAED,MAAM,kBAAkB,GAAG,YAAY,CAAC,KAAK,CAAC,QAAQ,EAAE,EAAE,cAAc,CAAC,CAAC;QAC1E,IAAI,CAAC,mBAAmB,CAAC,kBAAkB,CAAC,EAAE;YAC1C,MAAM,IAAI,KAAK,CAAC,4BAA4B,CAAC,CAAC;SACjD;QAED,IAAI,CAAC,aAAa,GAAG,kBAAkB,CAAC;IAC5C,CAAC;IAED;;OAEG;IACH;QACI,IAAI,CAAC,OAAO,GAAG,IAAI,CAAC;QACpB,IAAI,CAAC,MAAM,GAAG,IAAI,CAAC;QACnB,IAAI,CAAC,QAAQ,GAAG,IAAI,CAAC;QACrB,IAAI,CAAC,aAAa,GAAG,IAAI,CAAC;IAC9B,CAAC;IAED;;;OAGG;IACH,MAAM;QACF,OAAO;YACH,MAAM,EAAE,IAAI,CAAC,MAAM;YACnB,KAAK,EAAE,IAAI,CAAC,KAAK;YACjB,OAAO,EAAE,IAAI,CAAC,OAAO;YACrB,YAAY,EAAE,IAAI,CAAC,YAAY;SAClC,CAAC;IACN,CAAC;IAED;;;;OAIG;IACH,MAAM,CAAC,IAAI,CAAC,IAAc;QACtB,IAAI,IAAI,KAAK,IAAI,EAAE;YAAE,OAAO,IAAI,IAAI,EAAE,CAAC;SAAE;QAEzC,MAAM,MAAM,GAAG,IAAI,YAAY,IAAI,CAAC,CAAC,CAAC,IAAI,CAAC,CAAC,CAAC,IAAI,IAAI,EAAE,CAAC;QACxD,IAAI,IAAI,CAAC,MAAM,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,MAAM,GAAG,IAAI,CAAC,MAAM,CAAC;SAAE;QACzD,IAAI,IAAI,CAAC,KAAK,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,KAAK,GAAG,IAAI,CAAC,KAAK,CAAC;SAAE;QACtD,IAAI,IAAI,CAAC,OAAO,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,OAAO,GAAG,IAAI,CAAC,OAAO,CAAC;SAAE;QAC5D,IAAI,IAAI,CAAC,YAAY,IAAI,IAAI,EAAE;YAAE,MAAM,CAAC,YAAY,GAAG,IAAI,CAAC,YAAY,CAAC;SAAE;QAE3E,OAAO,MAAM,CAAC;IAClB,CAAC;CACJ"}
\ No newline at end of file
diff --git a/lib.esm/utils/maths.d.ts b/lib.esm/utils/maths.d.ts
index 661f0dfd..676f5294 100644
--- a/lib.esm/utils/maths.d.ts
+++ b/lib.esm/utils/maths.d.ts
@@ -30,6 +30,10 @@ export declare function mask(_value: BigNumberish, _bits: Numeric): bigint;
  *  a BigInt, then an ArgumentError will be thrown for %%name%%.
  */
 export declare function getBigInt(value: BigNumberish, name?: string): bigint;
+/**
+ * Returns absolute value of bigint %%value%%.
+ */
+export declare function bigIntAbs(value: BigNumberish): bigint;
 /**
  *  Returns %%value%% as a bigint, validating it is valid as a bigint
  *  value and that it is positive.
diff --git a/lib.esm/utils/maths.d.ts.map b/lib.esm/utils/maths.d.ts.map
index 626b19a4..f544e6fb 100644
--- a/lib.esm/utils/maths.d.ts.map
+++ b/lib.esm/utils/maths.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"maths.d.ts","sourceRoot":"","sources":["../../src.ts/utils/maths.ts"],"names":[],"mappings":"AAQA,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,WAAW,CAAC;AAE3C;;GAEG;AACH,MAAM,MAAM,OAAO,GAAG,MAAM,GAAG,MAAM,CAAC;AAEtC;;GAEG;AACH,MAAM,MAAM,YAAY,GAAG,MAAM,GAAG,OAAO,CAAC;AAY5C;;;;;GAKG;AACH,wBAAgB,QAAQ,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAetE;AAED;;;;;GAKG;AACH,wBAAgB,MAAM,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAoBpE;AAED;;GAEG;AACH,wBAAgB,IAAI,CAAC,MAAM,EAAE,YAAY,EAAE,KAAK,EAAE,OAAO,GAAG,MAAM,CAIjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAmBpE;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAMlE;AAQD,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAWjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAkBpE;AAGD;;;GAGG;AACH,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAEjE;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,CAAC,EAAE,OAAO,GAAG,MAAM,CAsBtE;AAED;;GAEG;AACH,wBAAgB,SAAS,CAAC,MAAM,EAAE,YAAY,GAAG,UAAU,CAe1D;AAED;;;;;;GAMG;AACH,wBAAgB,UAAU,CAAC,KAAK,EAAE,SAAS,GAAG,YAAY,GAAG,MAAM,CAKlE"}
\ No newline at end of file
+{"version":3,"file":"maths.d.ts","sourceRoot":"","sources":["../../src.ts/utils/maths.ts"],"names":[],"mappings":"AAQA,OAAO,KAAK,EAAE,SAAS,EAAE,MAAM,WAAW,CAAC;AAE3C;;GAEG;AACH,MAAM,MAAM,OAAO,GAAG,MAAM,GAAG,MAAM,CAAC;AAEtC;;GAEG;AACH,MAAM,MAAM,YAAY,GAAG,MAAM,GAAG,OAAO,CAAC;AAY5C;;;;;GAKG;AACH,wBAAgB,QAAQ,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAetE;AAED;;;;;GAKG;AACH,wBAAgB,MAAM,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,EAAE,OAAO,GAAG,MAAM,CAoBpE;AAED;;GAEG;AACH,wBAAgB,IAAI,CAAC,MAAM,EAAE,YAAY,EAAE,KAAK,EAAE,OAAO,GAAG,MAAM,CAIjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAmBpE;AAED;;GAEG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,GAAG,MAAM,CAQrD;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAMlE;AAQD,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAWjE;AAED;;;GAGG;AACH,wBAAgB,SAAS,CAAC,KAAK,EAAE,YAAY,EAAE,IAAI,CAAC,EAAE,MAAM,GAAG,MAAM,CAkBpE;AAGD;;;GAGG;AACH,wBAAgB,QAAQ,CAAC,KAAK,EAAE,YAAY,GAAG,UAAU,GAAG,MAAM,CAEjE;AAED;;;GAGG;AACH,wBAAgB,OAAO,CAAC,MAAM,EAAE,YAAY,EAAE,MAAM,CAAC,EAAE,OAAO,GAAG,MAAM,CAsBtE;AAED;;GAEG;AACH,wBAAgB,SAAS,CAAC,MAAM,EAAE,YAAY,GAAG,UAAU,CAe1D;AAED;;;;;;GAMG;AACH,wBAAgB,UAAU,CAAC,KAAK,EAAE,SAAS,GAAG,YAAY,GAAG,MAAM,CAKlE"}
\ No newline at end of file
diff --git a/lib.esm/utils/maths.js b/lib.esm/utils/maths.js
index c669dd36..9d37bb87 100644
--- a/lib.esm/utils/maths.js
+++ b/lib.esm/utils/maths.js
@@ -89,6 +89,17 @@ export function getBigInt(value, name) {
     }
     assertArgument(false, "invalid BigNumberish value", name || "value", value);
 }
+/**
+ * Returns absolute value of bigint %%value%%.
+ */
+export function bigIntAbs(value) {
+    value = getBigInt(value);
+    // if value is negative (including -0), return -value, else return value
+    if (value === -BN_0 || value < BN_0) {
+        return -value;
+    }
+    return value;
+}
 /**
  *  Returns %%value%% as a bigint, validating it is valid as a bigint
  *  value and that it is positive.
diff --git a/lib.esm/utils/maths.js.map b/lib.esm/utils/maths.js.map
index bd7b9fa6..87b3491a 100644
--- a/lib.esm/utils/maths.js.map
+++ b/lib.esm/utils/maths.js.map
@@ -1 +1 @@
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diff --git a/package-lock.json b/package-lock.json
index 84d20d1c..05c774f0 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -22,13 +22,16 @@
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+      "integrity": "sha512-g1MWMLBiz8FKi1e4w0UyVL3w+iJceWAFBAaBnnGKOpNa5f8TLktkbre1+s6oICydWAm+HRUGTmI+//xv2hvXYA==",
+      "dev": true,
+      "optional": true,
+      "dependencies": {
+        "minimist": "^1.2.0"
+      },
+      "bin": {
+        "json5": "lib/cli.js"
+      }
+    },
     "node_modules/locate-path": {
       "version": "6.0.0",
       "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-6.0.0.tgz",
@@ -1023,10 +1469,30 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/make-error": {
+      "version": "1.3.6",
+      "resolved": "https://registry.npmjs.org/make-error/-/make-error-1.3.6.tgz",
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+      "dev": true
+    },
+    "node_modules/micromatch": {
+      "version": "4.0.5",
+      "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.5.tgz",
+      "integrity": "sha512-DMy+ERcEW2q8Z2Po+WNXuw3c5YaUSFjAO5GsJqfEl7UjvtIuFKO6ZrKvcItdy98dwFI2N1tg3zNIdKaQT+aNdA==",
+      "dev": true,
+      "dependencies": {
+        "braces": "^3.0.2",
+        "picomatch": "^2.3.1"
+      },
+      "engines": {
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+      }
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+      "dev": true,
       "engines": {
         "node": ">= 0.6"
       }
@@ -1035,6 +1501,7 @@
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+      "dev": true,
       "dependencies": {
         "mime-db": "1.52.0"
       },
@@ -1054,6 +1521,27 @@
         "node": ">=10"
       }
     },
+    "node_modules/minimist": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/minimist/-/minimist-1.2.8.tgz",
+      "integrity": "sha512-2yyAR8qBkN3YuheJanUpWC5U3bb5osDywNB8RzDVlDwDHbocAJveqqj1u8+SVD7jkWT4yvsHCpWqqWqAxb0zCA==",
+      "dev": true,
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/mkdirp": {
+      "version": "0.5.6",
+      "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-0.5.6.tgz",
+      "integrity": "sha512-FP+p8RB8OWpF3YZBCrP5gtADmtXApB5AMLn+vdyA+PyxCjrCs00mjyUozssO33cwDeT3wNGdLxJ5M//YqtHAJw==",
+      "dev": true,
+      "dependencies": {
+        "minimist": "^1.2.6"
+      },
+      "bin": {
+        "mkdirp": "bin/cmd.js"
+      }
+    },
     "node_modules/mocha": {
       "version": "10.0.0",
       "resolved": "https://registry.npmjs.org/mocha/-/mocha-10.0.0.tgz",
@@ -1230,10 +1718,37 @@
         "url": "https://github.com/sponsors/jonschlinkert"
       }
     },
+    "node_modules/pretty-format": {
+      "version": "29.7.0",
+      "resolved": "https://registry.npmjs.org/pretty-format/-/pretty-format-29.7.0.tgz",
+      "integrity": "sha512-Pdlw/oPxN+aXdmM9R00JVC9WVFoCLTKJvDVLgmJ+qAffBMxsV85l/Lu7sNx4zSzPyoL2euImuEwHhOXdEgNFZQ==",
+      "dev": true,
+      "dependencies": {
+        "@jest/schemas": "^29.6.3",
+        "ansi-styles": "^5.0.0",
+        "react-is": "^18.0.0"
+      },
+      "engines": {
+        "node": "^14.15.0 || ^16.10.0 || >=18.0.0"
+      }
+    },
+    "node_modules/pretty-format/node_modules/ansi-styles": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-5.2.0.tgz",
+      "integrity": "sha512-Cxwpt2SfTzTtXcfOlzGEee8O+c+MmUgGrNiBcXnuWxuFJHe6a5Hz7qwhwe5OgaSYI0IJvkLqWX1ASG+cJOkEiA==",
+      "dev": true,
+      "engines": {
+        "node": ">=10"
+      },
+      "funding": {
+        "url": "https://github.com/chalk/ansi-styles?sponsor=1"
+      }
+    },
     "node_modules/proxy-from-env": {
       "version": "1.1.0",
       "resolved": "https://registry.npmjs.org/proxy-from-env/-/proxy-from-env-1.1.0.tgz",
-      "integrity": "sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg=="
+      "integrity": "sha512-D+zkORCbA9f1tdWRK0RaCR3GPv50cMxcrz4X8k5LTSUD1Dkw47mKJEZQNunItRTkWwgtaUSo1RVFRIG9ZXiFYg==",
+      "dev": true
     },
     "node_modules/randombytes": {
       "version": "2.1.0",
@@ -1244,6 +1759,12 @@
         "safe-buffer": "^5.1.0"
       }
     },
+    "node_modules/react-is": {
+      "version": "18.2.0",
+      "resolved": "https://registry.npmjs.org/react-is/-/react-is-18.2.0.tgz",
+      "integrity": "sha512-xWGDIW6x921xtzPkhiULtthJHoJvBbF3q26fzloPCK0hsvxtPVelvftw3zjbHWSkR2km9Z+4uxbDDK/6Zw9B8w==",
+      "dev": true
+    },
     "node_modules/readdirp": {
       "version": "3.6.0",
       "resolved": "https://registry.npmjs.org/readdirp/-/readdirp-3.6.0.tgz",
@@ -1384,6 +1905,55 @@
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       "dev": true
     },
+    "node_modules/slash": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/slash/-/slash-3.0.0.tgz",
+      "integrity": "sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/source-map": {
+      "version": "0.6.1",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.6.1.tgz",
+      "integrity": "sha512-UjgapumWlbMhkBgzT7Ykc5YXUT46F0iKu8SGXq0bcwP5dz/h0Plj6enJqjz1Zbq2l5WaqYnrVbwWOWMyF3F47g==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/source-map-support": {
+      "version": "0.5.21",
+      "resolved": "https://registry.npmjs.org/source-map-support/-/source-map-support-0.5.21.tgz",
+      "integrity": "sha512-uBHU3L3czsIyYXKX88fdrGovxdSCoTGDRZ6SYXtSRxLZUzHg5P/66Ht6uoUlHu9EZod+inXhKo3qQgwXUT/y1w==",
+      "dev": true,
+      "dependencies": {
+        "buffer-from": "^1.0.0",
+        "source-map": "^0.6.0"
+      }
+    },
+    "node_modules/stack-utils": {
+      "version": "2.0.6",
+      "resolved": "https://registry.npmjs.org/stack-utils/-/stack-utils-2.0.6.tgz",
+      "integrity": "sha512-XlkWvfIm6RmsWtNJx+uqtKLS8eqFbxUg0ZzLXqY0caEy9l7hruX8IpiDnjsLavoBgqCCR71TqWO8MaXYheJ3RQ==",
+      "dev": true,
+      "dependencies": {
+        "escape-string-regexp": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/stack-utils/node_modules/escape-string-regexp": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-2.0.0.tgz",
+      "integrity": "sha512-UpzcLCXolUWcNu5HtVMHYdXJjArjsF9C0aNnquZYY4uW/Vu0miy5YoWvbV345HauVvcAUnpRuhMMcqTcGOY2+w==",
+      "dev": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/string-width": {
       "version": "4.2.3",
       "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
@@ -1410,6 +1980,16 @@
         "node": ">=8"
       }
     },
+    "node_modules/strip-bom": {
+      "version": "3.0.0",
+      "resolved": "https://registry.npmjs.org/strip-bom/-/strip-bom-3.0.0.tgz",
+      "integrity": "sha512-vavAMRXOgBVNF6nyEEmL3DBK19iRpDcoIwW+swQ+CbGiu7lju6t+JklA1MHweoWtadgt4ISVUsXLyDq34ddcwA==",
+      "dev": true,
+      "optional": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/strip-json-comments": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-3.1.1.tgz",
@@ -1494,6 +2074,71 @@
         "node": ">=8.0"
       }
     },
+    "node_modules/ts-mocha": {
+      "version": "10.0.0",
+      "resolved": "https://registry.npmjs.org/ts-mocha/-/ts-mocha-10.0.0.tgz",
+      "integrity": "sha512-VRfgDO+iiuJFlNB18tzOfypJ21xn2xbuZyDvJvqpTbWgkAgD17ONGr8t+Tl8rcBtOBdjXp5e/Rk+d39f7XBHRw==",
+      "dev": true,
+      "dependencies": {
+        "ts-node": "7.0.1"
+      },
+      "bin": {
+        "ts-mocha": "bin/ts-mocha"
+      },
+      "engines": {
+        "node": ">= 6.X.X"
+      },
+      "optionalDependencies": {
+        "tsconfig-paths": "^3.5.0"
+      },
+      "peerDependencies": {
+        "mocha": "^3.X.X || ^4.X.X || ^5.X.X || ^6.X.X || ^7.X.X || ^8.X.X || ^9.X.X || ^10.X.X"
+      }
+    },
+    "node_modules/ts-node": {
+      "version": "7.0.1",
+      "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-7.0.1.tgz",
+      "integrity": "sha512-BVwVbPJRspzNh2yfslyT1PSbl5uIk03EZlb493RKHN4qej/D06n1cEhjlOJG69oFsE7OT8XjpTUcYf6pKTLMhw==",
+      "dev": true,
+      "dependencies": {
+        "arrify": "^1.0.0",
+        "buffer-from": "^1.1.0",
+        "diff": "^3.1.0",
+        "make-error": "^1.1.1",
+        "minimist": "^1.2.0",
+        "mkdirp": "^0.5.1",
+        "source-map-support": "^0.5.6",
+        "yn": "^2.0.0"
+      },
+      "bin": {
+        "ts-node": "dist/bin.js"
+      },
+      "engines": {
+        "node": ">=4.2.0"
+      }
+    },
+    "node_modules/ts-node/node_modules/diff": {
+      "version": "3.5.0",
+      "resolved": "https://registry.npmjs.org/diff/-/diff-3.5.0.tgz",
+      "integrity": "sha512-A46qtFgd+g7pDZinpnwiRJtxbC1hpgf0uzP3iG89scHk0AUC7A1TGxf5OiiOUv/JMZR8GOt8hL900hV0bOy5xA==",
+      "dev": true,
+      "engines": {
+        "node": ">=0.3.1"
+      }
+    },
+    "node_modules/tsconfig-paths": {
+      "version": "3.15.0",
+      "resolved": "https://registry.npmjs.org/tsconfig-paths/-/tsconfig-paths-3.15.0.tgz",
+      "integrity": "sha512-2Ac2RgzDe/cn48GvOe3M+o82pEFewD3UPbyoUHHdKasHwJKjds4fLXWf/Ux5kATBKN20oaFGu+jbElp1pos0mg==",
+      "dev": true,
+      "optional": true,
+      "dependencies": {
+        "@types/json5": "^0.0.29",
+        "json5": "^1.0.2",
+        "minimist": "^1.2.6",
+        "strip-bom": "^3.0.0"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.4.0",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.4.0.tgz",
@@ -1659,6 +2304,15 @@
         "node": ">=10"
       }
     },
+    "node_modules/yn": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/yn/-/yn-2.0.0.tgz",
+      "integrity": "sha512-uTv8J/wiWTgUTg+9vLTi//leUl5vDQS6uii/emeTb2ssY7vl6QWf2fFbIIGjnhjvbdKlU0ed7QPgY1htTC86jQ==",
+      "dev": true,
+      "engines": {
+        "node": ">=4"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/package.json b/package.json
index fe669516..14944972 100644
--- a/package.json
+++ b/package.json
@@ -24,12 +24,15 @@
   "devDependencies": {
     "@rollup/plugin-node-resolve": "15.0.2",
     "@types/google-protobuf": "^3.15.12",
-    "@types/mocha": "9.1.1",
+    "@types/expect": "^24.3.0",
+    "@types/mocha": "^9.1.1",
     "@types/semver": "7.5.0",
+    "axios": "^1.6.7",
     "c8": "7.12.0",
     "mocha": "10.0.0",
     "rollup": "3.21.5",
     "semver": "7.5.4",
+    "ts-mocha": "^10.0.0",
     "typescript": "5.0.4",
     "uglify-js": "3.17.0"
   },
diff --git a/src.ts/_tests/test-utxo-coinselection.ts b/src.ts/_tests/test-utxo-coinselection.ts
new file mode 100644
index 00000000..91979404
--- /dev/null
+++ b/src.ts/_tests/test-utxo-coinselection.ts
@@ -0,0 +1,119 @@
+import assert from "assert";
+import { FewestCoinSelector } from "../transaction/coinselector-fewest";
+import { UTXOLike, denominations } from "../transaction/utxo";
+
+const TEST_SPEND_ADDRESS = "0x00539bc2CE3eD0FD039c582CB700EF5398bB0491";
+const TEST_RECEIVE_ADDRESS = "0x02b9B1D30B6cCdc7d908B82739ce891463c3FA19";
+
+// Utility function to create UTXOs (adjust as necessary)
+function createUTXOs(denominations: bigint[]): UTXOLike[] {
+    return denominations.map(denomination => ({
+        denomination,
+        address: TEST_SPEND_ADDRESS
+    }));
+}
+
+describe("FewestCoinSelector", function () {
+    describe("Selecting valid UTXOs", function () {
+        it("selects a single UTXO that exactly matches the target amount", function () {
+            const availableUTXOs = createUTXOs([denominations[1], denominations[2], denominations[3]]); // .065 Qi
+            const targetSpend = { value: denominations[3], address: TEST_RECEIVE_ADDRESS }; // .05 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+
+            // A single 0.05 Qi UTXO should have been selected
+            assert.strictEqual(result.inputs.length, 1);
+            assert.strictEqual(result.inputs[0].denomination, denominations[3]);
+
+            // A single new 0.05 Qi UTXO should have been outputed
+            assert.strictEqual(result.spendOutputs.length, 1);
+            assert.strictEqual(result.spendOutputs[0].denomination, denominations[3]);
+
+            // No change should be returned
+            assert.strictEqual(result.changeOutputs.length, 0);
+        });
+
+        it("selects multiple UTXOs whose combined value meets the target amount", function () {
+            const availableUTXOs = createUTXOs([denominations[1], denominations[2], denominations[2], denominations[3]]); // .075 Qi
+            const targetSpend = { value: denominations[2] + denominations[3], address: TEST_RECEIVE_ADDRESS }; // .06 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+
+            // 2 UTXOs should have been selected for a total of .06 Qi
+            assert.strictEqual(result.inputs.length, 2);
+            const inputValue = result.inputs[0].denomination! + result.inputs[1].denomination!;
+            assert.strictEqual(inputValue, denominations[2] + denominations[3]);
+
+            // 2 new UTxOs should have been outputed for a total of .06 Qi
+            assert.strictEqual(result.spendOutputs.length, 2);
+            const spendValue = result.spendOutputs[0].denomination! + result.spendOutputs[1].denomination!;
+            assert.strictEqual(spendValue, denominations[2] + denominations[3]);
+
+            // No change should be returned
+            assert.strictEqual(result.changeOutputs.length, 0);
+        });
+
+        it("selects a single UTXO that is larger than the target amount, ensuring change is correctly calculated", function () {
+            const availableUTXOs = createUTXOs([denominations[2], denominations[4]]); // .11 Qi
+            const targetSpend = { value: denominations[3], address: TEST_RECEIVE_ADDRESS }; // .05 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+
+            // A single 0.1 Qi UTXO should have been selected
+            assert.strictEqual(result.inputs.length, 1);
+            assert.strictEqual(result.inputs[0].denomination, denominations[4]);
+
+            // A single new 0.05 Qi UTXO should have been outputed
+            assert.strictEqual(result.spendOutputs.length, 1);
+            assert.strictEqual(result.spendOutputs[0].denomination, denominations[3]);
+
+            // 0.05 Qi should be returned in change
+            assert.strictEqual(result.changeOutputs.length, 1);
+            assert.strictEqual(result.changeOutputs[0].denomination, denominations[3]);
+        });
+
+        it("selects multiple UTXOs where the total exceeds the target amount, ensuring change is correctly calculated", function () {
+            const availableUTXOs = createUTXOs([
+                denominations[2],
+                denominations[4],
+                denominations[4],
+                denominations[4],
+                denominations[5]
+            ]); // .56 Qi
+            const targetSpend = { value: denominations[6], address: TEST_RECEIVE_ADDRESS }; // .5 Qi
+            const selector = new FewestCoinSelector(availableUTXOs);
+            const result = selector.performSelection(targetSpend);
+
+            // 4 UTXOs should have been selected for a total of .55 Qi
+            assert.strictEqual(result.inputs.length, 4);
+            const inputValue = result.inputs[0].denomination! + result.inputs[1].denomination! + result.inputs[2].denomination! + result.inputs[3].denomination!;
+            assert.strictEqual(inputValue, denominations[4] + denominations[4] + denominations[4] + denominations[5]);
+
+            // A single new 0.5 Qi UTXO should have been outputed 
+            assert.strictEqual(result.spendOutputs.length, 1);
+            assert.strictEqual(result.spendOutputs[0].denomination, denominations[6]);
+
+            // 0.05 Qi should be returned in change
+            assert.strictEqual(result.changeOutputs.length, 1);
+            assert.strictEqual(result.changeOutputs[0].denomination, denominations[3]);
+
+        });
+    });
+
+    describe("Selecting valid UTXOs", function () {
+        it("throws an error when there are insufficient funds", function () {
+            const selector = new FewestCoinSelector(createUTXOs([denominations[0], denominations[0]]));
+            assert.throws(() => selector.performSelection({ value: denominations[3], address: TEST_RECEIVE_ADDRESS }), /Insufficient funds/);
+        });
+
+        it("throws an error when no UTXOs are available", function () {
+            const selector = new FewestCoinSelector([]);
+            assert.throws(() => selector.performSelection({ value: denominations[2], address: TEST_RECEIVE_ADDRESS }), /No UTXOs available/);
+        });
+
+        it("throws an error when the target amount is negative", function () {
+            const selector = new FewestCoinSelector(createUTXOs([denominations[2], denominations[2]]));
+            assert.throws(() => selector.performSelection({ value: -denominations[1], address: TEST_RECEIVE_ADDRESS }), /Target amount must be greater than 0/);
+        });
+    });
+});
\ No newline at end of file
diff --git a/src.ts/transaction/abstract-coinselector.ts b/src.ts/transaction/abstract-coinselector.ts
new file mode 100644
index 00000000..a93f030e
--- /dev/null
+++ b/src.ts/transaction/abstract-coinselector.ts
@@ -0,0 +1,89 @@
+import { UTXO, UTXOLike } from "./utxo.js";
+
+export type SpendTarget = {
+    address: string;
+    value: bigint;
+};
+
+export type SelectedCoinsResult = {
+    inputs: UTXO[];
+    spendOutputs: UTXO[];
+    changeOutputs: UTXO[];
+};
+
+/**
+ * An **AbstractCoinSelector** provides a base class for other sub-classes to
+ * implement the functionality for selecting UTXOs for a spend and to properly
+ * handle spend and change outputs.
+ * 
+ * This class is abstract and should not be used directly. Sub-classes should
+ * implement the [[performSelection]] method to provide the actual coin
+ * selection logic.
+ * 
+ * @abstract
+ */
+export abstract class AbstractCoinSelector {
+    #availableUXTOs: UTXO[];
+    #spendOutputs: UTXO[];
+    #changeOutputs: UTXO[];
+
+    get availableUXTOs(): UTXO[] { return this.#availableUXTOs; }
+    set availableUXTOs(value: UTXOLike[]) {
+        this.#availableUXTOs = value.map((val: UTXOLike) => {
+            const utxo = UTXO.from(val);
+            this._validateUTXO(utxo);
+            return utxo;
+        });
+    }
+
+    get spendOutputs(): UTXO[] { return this.#spendOutputs; }
+    set spendOutputs(value: UTXOLike[]) {
+        this.#spendOutputs = value.map((utxo: UTXOLike) => UTXO.from(utxo));
+    }
+
+    get changeOutputs(): UTXO[] { return this.#changeOutputs; }
+    set changeOutputs(value: UTXOLike[]) {
+        this.#changeOutputs = value.map((utxo: UTXOLike) => UTXO.from(utxo));
+    }
+
+    /**
+     * Constructs a new AbstractCoinSelector instance with an empty UTXO array.
+     */
+    constructor(availableUXTOs: UTXOLike[] = []) {
+        this.#availableUXTOs = availableUXTOs.map((val: UTXOLike) => {
+            const utxo = UTXO.from(val);
+            this._validateUTXO(utxo);
+            return utxo;
+        });
+        this.#spendOutputs = [];
+        this.#changeOutputs = [];
+    }
+
+    /**
+     * This method should be implemented by sub-classes to provide the actual
+     * coin selection logic. It should select UTXOs from the available UTXOs
+     * that sum to the target amount and return the selected UTXOs as well as
+     * the spend and change outputs.
+     * @param target The target amount to select UTXOs for.
+     */
+    abstract performSelection(target: SpendTarget): SelectedCoinsResult;
+
+    /**
+     * Validates the provided UTXO instance. In order to be valid for coin 
+     * selection, the UTXO must have a valid address and denomination.
+     * @param utxo The UTXO instance to validate.
+     * @throws An error if the UTXO instance is invalid.
+     */
+    protected _validateUTXO(utxo: UTXO): void {
+        if (utxo.address == null) {
+            throw new Error("UTXO address is required");
+        }
+
+        if (utxo.denomination == null) {
+            throw new Error("UTXO denomination is required");
+        }
+    }
+
+
+
+}
diff --git a/src.ts/transaction/coinselector-fewest.ts b/src.ts/transaction/coinselector-fewest.ts
new file mode 100644
index 00000000..deea4c03
--- /dev/null
+++ b/src.ts/transaction/coinselector-fewest.ts
@@ -0,0 +1,159 @@
+import { bigIntAbs } from "../utils/maths.js";
+import { AbstractCoinSelector, SelectedCoinsResult, SpendTarget } from "./abstract-coinselector.js";
+import { UTXO, denominate } from "./utxo.js";
+
+
+/**
+ * The FewestCoinSelector class provides a coin selection algorithm that selects
+ * the fewest UTXOs required to meet the target amount. This algorithm is useful
+ * for minimizing the size of the transaction and the fees associated with it.
+ * 
+ * This class is a sub-class of [[AbstractCoinSelector]] and implements the
+ * [[performSelection]] method to provide the actual coin selection logic.
+ */
+export class FewestCoinSelector extends AbstractCoinSelector {
+
+    /**
+     * The largest first coin selection algorithm.
+     * 
+     * This algorithm selects the largest UTXOs first, and continues to select UTXOs until the
+     * target amount is reached. If the total value of the selected UTXOs is greater than the
+     * target amount, the remaining value is returned as a change output.
+     * @param target The target amount to select UTXOs for.
+     */
+    performSelection(target: SpendTarget): SelectedCoinsResult {
+        this.validateTarget(target);
+        this.validateUTXOs();
+
+        const sortedUTXOs = this.sortUTXOsByDenomination(this.availableUXTOs, "desc");
+
+        let totalValue = BigInt(0);
+        let selectedUTXOs: UTXO[] = [];
+
+        // Get UTXOs that meets or exceeds the target value
+        const UTXOsEqualOrGreaterThanTarget = sortedUTXOs.filter(utxo => utxo.denomination && utxo.denomination >= target.value);
+
+        if (UTXOsEqualOrGreaterThanTarget.length > 0) {
+            // Find the smallest UTXO that meets or exceeds the target value
+            const optimalUTXO = UTXOsEqualOrGreaterThanTarget.reduce((minDenominationUTXO, currentUTXO) => {
+                if (!currentUTXO.denomination) return minDenominationUTXO;
+                return currentUTXO.denomination < minDenominationUTXO.denomination! ? currentUTXO : minDenominationUTXO;
+            }, UTXOsEqualOrGreaterThanTarget[0]); // Initialize with the first UTXO in the list
+
+            selectedUTXOs.push(optimalUTXO);
+            totalValue += optimalUTXO.denomination!;
+        } else {
+            // If no single UTXO meets or exceeds the target, aggregate smaller denominations
+            // until the target is met/exceeded or there are no more UTXOs to aggregate
+            while (sortedUTXOs.length > 0 && totalValue < target.value) {
+                const nextOptimalUTXO = sortedUTXOs.reduce<UTXO>((closest, utxo) => {
+                    if (!utxo.denomination) return closest;
+
+                    // Prioritize UTXOs that bring totalValue closer to target.value
+                    const absThisDiff = bigIntAbs(target.value - (totalValue + utxo.denomination));
+                    const currentClosestDiff = closest && closest.denomination
+                        ? bigIntAbs(target.value - (totalValue + closest.denomination))
+                        : BigInt(Infinity);
+
+                    return absThisDiff < currentClosestDiff ? utxo : closest;
+
+                }, sortedUTXOs[0]);
+
+                // Add the selected UTXO to the selection and update totalValue
+                selectedUTXOs.push(nextOptimalUTXO);
+                totalValue += nextOptimalUTXO.denomination!;
+
+                // Remove the selected UTXO from the list of available UTXOs
+                const index = sortedUTXOs.findIndex(utxo => utxo.denomination === nextOptimalUTXO.denomination && utxo.address === nextOptimalUTXO.address);
+                sortedUTXOs.splice(index, 1);
+            }
+        }
+
+        // Check if the selected UTXOs meet or exceed the target amount
+        if (totalValue < target.value) {
+            throw new Error("Insufficient funds");
+        }
+
+        // // Check if any denominations can be removed from the input set and it still remain valid
+        selectedUTXOs = this.sortUTXOsByDenomination(selectedUTXOs, "asc");
+
+        let runningTotal = totalValue;
+        let lastRemovableIndex = -1; // Index of the last UTXO that can be removed
+
+        // Iterate through selectedUTXOs to find the last removable UTXO
+        for (let i = 0; i < selectedUTXOs.length; i++) {
+            const utxo = selectedUTXOs[i];
+            if (utxo.denomination) {
+                if (runningTotal - utxo.denomination >= target.value) {
+                    runningTotal -= utxo.denomination;
+                    lastRemovableIndex = i;
+                } else {
+                    // Once a UTXO makes the total less than target.value, stop the loop
+                    break;
+                }
+            }
+        }
+
+        if (lastRemovableIndex >= 0) {
+            totalValue -= selectedUTXOs[lastRemovableIndex].denomination!;
+            selectedUTXOs.splice(lastRemovableIndex, 1);
+        }
+
+        // Break down the total spend into properly denominatated UTXOs
+        const spendDenominations = denominate(target.value);
+        this.spendOutputs = spendDenominations.map(denomination => {
+            const utxo = new UTXO();
+            utxo.denomination = denomination;
+            utxo.address = target.address;
+            return utxo;
+        });
+
+        // Calculate change to be returned
+        const change = totalValue - target.value;
+
+        // If there's change, break it down into properly denominatated UTXOs
+        if (change > BigInt(0)) {
+            const changeDenominations = denominate(change);
+            this.changeOutputs = changeDenominations.map(denomination => {
+                const utxo = new UTXO();
+                utxo.denomination = denomination;
+                // We do not have access to change addresses here so leave it null
+                return utxo;
+            });
+        } else {
+            this.changeOutputs = [];
+        }
+
+        return {
+            inputs: selectedUTXOs,
+            spendOutputs: this.spendOutputs,
+            changeOutputs: this.changeOutputs,
+        };
+    }
+
+    private sortUTXOsByDenomination(utxos: UTXO[], direction: "asc" | "desc"): UTXO[] {
+        if (direction === "asc") {
+            return [...utxos].sort((a, b) => {
+                const diff = (a.denomination ?? BigInt(0)) - (b.denomination ?? BigInt(0));
+                return diff > 0 ? 1 : diff < 0 ? -1 : 0;
+            });
+        }
+        return [...utxos].sort((a, b) => {
+            const diff = (b.denomination ?? BigInt(0)) - (a.denomination ?? BigInt(0));
+            return diff > 0 ? 1 : diff < 0 ? -1 : 0;
+        });
+    }
+
+    private validateTarget(target: SpendTarget) {
+        if (target.value <= BigInt(0)) {
+            throw new Error("Target amount must be greater than 0");
+        }
+    }
+
+    private validateUTXOs() {
+        if (this.availableUXTOs.length === 0) {
+            throw new Error("No UTXOs available");
+        }
+    }
+
+}
diff --git a/src.ts/transaction/utxo.ts b/src.ts/transaction/utxo.ts
new file mode 100644
index 00000000..32574956
--- /dev/null
+++ b/src.ts/transaction/utxo.ts
@@ -0,0 +1,182 @@
+import { getAddress } from "../address/index";
+import { getBigInt } from "../utils/index";
+import type { BigNumberish } from "../utils/index";
+
+export type OutPoint = {
+    txhash: string;
+    index: number;
+};
+
+export type UTXOTransactionInput = {
+    previousOutPoint: OutPoint;
+    pubKey: Uint8Array;
+};
+
+export interface UTXOEntry {
+    denomination: null | bigint;
+    address: null | string;
+};
+
+export type UTXOTransactionOutput = UTXOEntry;
+
+export type UTXOTransaction = {
+    chainId: bigint;
+    inputs: UTXOTransactionInput[];
+    outputs: UTXOTransactionOutput[];
+    signature?: Uint8Array;
+};
+
+export interface UTXOLike extends UTXOEntry {
+    txhash?: null | string;
+    index?: null | number;
+}
+
+export const denominations: bigint[] = [
+    BigInt(1),           // 0.001 Qi
+    BigInt(5),           // 0.005 Qi
+    BigInt(10),          // 0.01 Qi
+    BigInt(50),          // 0.05 Qi
+    BigInt(100),         // 0.1 Qi
+    BigInt(250),         // 0.25 Qi
+    BigInt(500),         // 0.5 Qi
+    BigInt(1000),        // 1 Qi
+    BigInt(5000),        // 5 Qi
+    BigInt(10000),       // 10 Qi
+    BigInt(20000),       // 20 Qi 
+    BigInt(50000),       // 50 Qi
+    BigInt(100000),      // 100 Qi
+    BigInt(1000000),     // 1000 Qi
+    BigInt(10000000),    // 10000 Qi
+    BigInt(100000000),   // 100000 Qi
+    BigInt(1000000000),  // 1000000 Qi
+];
+
+/**
+ * Checks if the provided denomination is valid.
+ * @param denomination The denomination to check.
+ * @returns True if the denomination is valid, false otherwise.
+ */
+function isValidDenomination(denomination: bigint): boolean {
+    return denominations.includes(denomination);
+}
+
+/**
+ * Handles conversion of string to bigint, specifically for transaction parameters.
+ * @param value The string value to convert.
+ * @param param The parameter name for error context.
+ * @returns The bigint representation of the input string.
+ */
+function handleBigInt(value: string, param: string): bigint {
+    if (value === "0x") { return BigInt(0); }
+    return getBigInt(value, param);
+}
+
+/**
+ * Given a value, returns an array of supported denominations that sum to the value.
+ * @param value The value to denominate.
+ * @returns Array of supported denominations that sum to the value.
+ */
+export function denominate(value: bigint): bigint[] {
+    if (value <= BigInt(0)) {
+        throw new Error("Value must be greater than 0");
+    }
+
+    const result: bigint[] = [];
+    let remainingValue = value;
+
+    // Iterate through denominations in descending order
+    for (let i = denominations.length - 1; i >= 0; i--) {
+        const denomination = denominations[i];
+
+        // Add the denomination to the result array as many times as possible
+        while (remainingValue >= denomination) {
+            result.push(denomination);
+            remainingValue -= denomination;
+        }
+    }
+
+    if (remainingValue > 0) {
+        throw new Error("Unable to match the value with available denominations");
+    }
+
+
+
+    return result;
+}
+
+export class UTXO implements UTXOLike {
+    #txhash: null | string;
+    #index: null | number;
+    #address: null | string;
+    #denomination: null | bigint;
+
+    get txhash(): null | string { return this.#txhash; }
+    set txhash(value: null | string) {
+        this.#txhash = value;
+    }
+
+    get index(): null | number { return this.#index; }
+    set index(value: null | number) {
+        this.#index = value;
+    }
+
+    get address(): null | string { return this.#address; }
+    set address(value: null | string) {
+        this.#address = (value == null) ? null : getAddress(value);
+    }
+
+    get denomination(): null | bigint { return this.#denomination; }
+    set denomination(value: null | BigNumberish) {
+        if (value == null) {
+            this.#denomination = null;
+            return;
+        }
+
+        const denominationBigInt = handleBigInt(value.toString(), "denomination");
+        if (!isValidDenomination(denominationBigInt)) {
+            throw new Error("Invalid denomination value");
+        }
+
+        this.#denomination = denominationBigInt;
+    }
+
+    /**
+     * Constructs a new UTXO instance with null properties.
+     */
+    constructor() {
+        this.#txhash = null;
+        this.#index = null;
+        this.#address = null;
+        this.#denomination = null;
+    }
+
+    /**
+     * Converts the UTXO instance to a JSON object.
+     * @returns A JSON representation of the UTXO instance.
+     */
+    toJSON(): any {
+        return {
+            txhash: this.txhash,
+            index: this.index,
+            address: this.address,
+            denomination: this.denomination,
+        };
+    }
+
+    /**
+     * Creates a UTXO instance from a UTXOLike object.
+     * @param utxo The UTXOLike object to create the UTXO instance from.
+     * @returns A new UTXO instance.
+     */
+    static from(utxo: UTXOLike): UTXO {
+        if (utxo === null) { return new UTXO(); }
+
+        const result = utxo instanceof UTXO ? utxo : new UTXO();
+        if (utxo.txhash != null) { result.txhash = utxo.txhash; }
+        if (utxo.index != null) { result.index = utxo.index; }
+        if (utxo.address != null) { result.address = utxo.address; }
+        if (utxo.denomination != null) { result.denomination = utxo.denomination; }
+
+        return result;
+    }
+}
diff --git a/src.ts/utils/maths.ts b/src.ts/utils/maths.ts
index 0200c27a..6a8bd278 100644
--- a/src.ts/utils/maths.ts
+++ b/src.ts/utils/maths.ts
@@ -93,7 +93,7 @@ export function mask(_value: BigNumberish, _bits: Numeric): bigint {
  *  a BigInt, then an ArgumentError will be thrown for %%name%%.
  */
 export function getBigInt(value: BigNumberish, name?: string): bigint {
-    switch (typeof(value)) {
+    switch (typeof (value)) {
         case "bigint": return value;
         case "number":
             assertArgument(Number.isInteger(value), "underflow", name || "value", value);
@@ -106,13 +106,26 @@ export function getBigInt(value: BigNumberish, name?: string): bigint {
                     return -BigInt(value.substring(1));
                 }
                 return BigInt(value);
-            } catch(e: any) {
-                assertArgument(false, `invalid BigNumberish string: ${ e.message }`, name || "value", value);
+            } catch (e: any) {
+                assertArgument(false, `invalid BigNumberish string: ${e.message}`, name || "value", value);
             }
     }
     assertArgument(false, "invalid BigNumberish value", name || "value", value);
 }
 
+/**
+ * Returns absolute value of bigint %%value%%. 
+ */
+export function bigIntAbs(value: BigNumberish): bigint {
+    value = getBigInt(value);
+
+    // if value is negative (including -0), return -value, else return value
+    if (value === -BN_0 || value < BN_0) {
+        return -value;
+    }
+    return value;
+}
+
 /**
  *  Returns %%value%% as a bigint, validating it is valid as a bigint
  *  value and that it is positive.
@@ -149,7 +162,7 @@ export function toBigInt(value: BigNumberish | Uint8Array): bigint {
  *  a //number//, then an ArgumentError will be thrown for %%name%%.
  */
 export function getNumber(value: BigNumberish, name?: string): number {
-    switch (typeof(value)) {
+    switch (typeof (value)) {
         case "bigint":
             assertArgument(value >= -maxValue && value <= maxValue, "overflow", name || "value", value);
             return Number(value);
@@ -161,8 +174,8 @@ export function getNumber(value: BigNumberish, name?: string): number {
             try {
                 if (value === "") { throw new Error("empty string"); }
                 return getNumber(BigInt(value), name);
-            } catch(e: any) {
-                assertArgument(false, `invalid numeric string: ${ e.message }`, name || "value", value);
+            } catch (e: any) {
+                assertArgument(false, `invalid numeric string: ${e.message}`, name || "value", value);
             }
     }
     assertArgument(false, "invalid numeric value", name || "value", value);
@@ -191,7 +204,7 @@ export function toBeHex(_value: BigNumberish, _width?: Numeric): string {
         if (result.length % 2) { result = "0" + result; }
     } else {
         const width = getNumber(_width, "width");
-        assert(width * 2 >= result.length, `value exceeds width (${ width } bytes)`, "NUMERIC_FAULT", {
+        assert(width * 2 >= result.length, `value exceeds width (${width} bytes)`, "NUMERIC_FAULT", {
             operation: "toBeHex",
             fault: "overflow",
             value: _value
@@ -211,7 +224,7 @@ export function toBeHex(_value: BigNumberish, _width?: Numeric): string {
 export function toBeArray(_value: BigNumberish): Uint8Array {
     const value = getUint(_value, "value");
 
-    if (value === BN_0) { return new Uint8Array([ ]); }
+    if (value === BN_0) { return new Uint8Array([]); }
 
     let hex = value.toString(16);
     if (hex.length % 2) { hex = "0" + hex; }
@@ -233,7 +246,7 @@ export function toBeArray(_value: BigNumberish): Uint8Array {
  *  numeric values.
  */
 export function toQuantity(value: BytesLike | BigNumberish): string {
-    let result = hexlify(isBytesLike(value) ? value: toBeArray(value)).substring(2);
+    let result = hexlify(isBytesLike(value) ? value : toBeArray(value)).substring(2);
     while (result.startsWith("0")) { result = result.substring(1); }
     if (result === "") { result = "0"; }
     return "0x" + result;