diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..ba4f05c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,14 @@
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+.vscode
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..1734a34
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2018 StringSquirrel <inbox@strsqr.com>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..b116706
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,2 @@
+test:
+	go test -race -timeout 30s `go list ./... | grep -v /vendor/`
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4b5ce1d
--- /dev/null
+++ b/README.md
@@ -0,0 +1,63 @@
+# crptwav
+
+Simple wallet address validator for validating Bitcoin and other altcoins addresses.
+
+It is a port of JavaScript library [https://github.com/ognus/wallet-address-validator](https://github.com/ognus/wallet-address-validator).
+
+## Example
+
+```go
+package main
+
+import (
+    "fmt"
+    "github.com/strsqr/crptwav"
+)
+
+func main() {
+    fmt.Println(crptwav.IsValid("0xE37c0D48d68da5c5b14E5c1a9f1CFE802776D9FF", "ETH", "both"))
+}
+```
+
+### Supported crypto currencies (todo)
+
+- [ ] Auroracoin/AUR, `'auroracoin'` or `'AUR'`
+- [ ] BeaverCoin/BVC, `'beavercoin'` or `'BVC'`
+- [ ] Biocoin/BIO, `'biocoin'` or `'BIO'`
+- [ ] Bitcoin/BTC, `'bitcoin'` or `'BTC'`
+- [ ] BitcoinCash/BCH, `'bitcoincash'` or `'BCH'`
+- [ ] BitcoinGold/BTG, `'bitcoingold'` or `'BTG'`
+- [ ] BitcoinPrivate/BTCP, `'bitcoinprivate'` or `'BTCP'`
+- [ ] BitcoinZ/BTCZ, `'bitcoinz'` or `'BTCZ'`
+- [x] Callisto/CLO, `'callisto'` or `'CLO'`
+- [ ] Dash, `'dash'` or `'DASH'`
+- [ ] Decred/DCR, `'decred'` or `'DCR'`
+- [ ] Digibyte/DGB, `'digibyte'` or `'DGB'`
+- [ ] Dogecoin/DOGE, `'dogecoin'` or `'DOGE'`
+- [x] Ethereum/ETH, `'ethereum'` or `'ETH'`
+- [x] EthereumClassic/ETH, `'ethereumclassic'` or `'ETC'`
+- [x] EthereumZero/ETZ, `'etherzero'` or `'ETZ'`
+- [ ] Freicoin/FRC, `'freicoin'` or `'FRC'`
+- [ ] Garlicoin/GRLC, `'garlicoin'` or `'GRLC'`
+- [ ] Hush/HUSH, `'hush'` or `'HUSH'`
+- [ ] Komodo/KMD, `'komodo'` or `'KMD'`
+- [ ] Litecoin/LTC, `'litecoin'` or `'LTC'`
+- [ ] Megacoin/MEC, `'megacoin'` or `'MEC'`
+- [ ] Namecoin/NMC, `'namecoin'` or `'NMC'`
+- [ ] NEO/NEO, `'NEO'` or `'NEO'`
+- [ ] NeoGas/GAS, `'neogas'` or `'GAS'`
+- [ ] Peercoin/PPCoin/PPC, `'peercoin'` or `'PPC'`
+- [ ] Primecoin/XPM, `'primecoin'` or `'XPM'`
+- [ ] Protoshares/PTS, `'protoshares'` or `'PTS'`
+- [ ] Qtum/QTUM, `'qtum'` or `'QTUM'`
+- [ ] Ripple/XRP, `'ripple'` or `'XRP'`
+- [ ] Snowgem/SNG, `'snowgem'` or `'SNG'`
+- [ ] Vertcoin/VTC, `'vertcoin'` or `'VTC'`
+- [ ] Votecoin/VTC, `'votecoin'` or `'VOT'`
+- [ ] Zcash/ZEC, `'zcash'` or `'ZEC'`
+- [ ] Zclassic/ZCL, `'zclassic'` or `'ZCL'`
+- [ ] ZenCash/ZEN, `'zencash'` or `'ZEN'`
+
+## License
+
+[MIT](LICENSE)
diff --git a/crptv.go b/crptv.go
new file mode 100644
index 0000000..9cf9d5b
--- /dev/null
+++ b/crptv.go
@@ -0,0 +1,18 @@
+package crptwav
+
+import "strings"
+
+// IsValid validates the given currency address.
+// address - Wallet address to validate.
+// currency - Currency name or symbol, e.g. "bitcoin", "litecoin" or "ETH".
+// network - Use "prod" to enforce standard address, "testnet" to enforce
+// testnet address and "both" to enforce nothing.
+func IsValid(address, currency, network string) bool {
+	nameOrSymbol := strings.ToLower(currency)
+	for _, c := range currencies {
+		if c.name == nameOrSymbol || c.symbol == nameOrSymbol {
+			return c.validator(address, network)
+		}
+	}
+	return false
+}
diff --git a/crypto/crypto.go b/crypto/crypto.go
new file mode 100644
index 0000000..db71227
--- /dev/null
+++ b/crypto/crypto.go
@@ -0,0 +1,10 @@
+package crypto
+
+import "golang.org/x/crypto/sha3"
+
+// Keccak256 calculates and returns the Keccak256 hash of the input data.
+func Keccak256(b []byte) []byte {
+	h := sha3.NewLegacyKeccak256()
+	h.Write(b)
+	return h.Sum(nil)
+}
diff --git a/crypto/crypto_test.go b/crypto/crypto_test.go
new file mode 100644
index 0000000..0e097a8
--- /dev/null
+++ b/crypto/crypto_test.go
@@ -0,0 +1,63 @@
+package crypto
+
+import (
+	"encoding/hex"
+	"strings"
+	"testing"
+)
+
+func TestKeccak256(t *testing.T) {
+	tt := []struct {
+		desc   string
+		input  []byte
+		repeat int // input will be concatenated the input this many times.
+		want   string
+	}{
+		// Inputs of 8, 248, and 264 bits from http://keccak.noekeon.org/ are included below.
+		{
+			desc:   "short-8b",
+			input:  decodeHex("CC"),
+			repeat: 1,
+			want:   "EEAD6DBFC7340A56CAEDC044696A168870549A6A7F6F56961E84A54BD9970B8A",
+		},
+		{
+			desc:   "short-248b",
+			input:  decodeHex("84FB51B517DF6C5ACCB5D022F8F28DA09B10232D42320FFC32DBECC3835B29"),
+			repeat: 1,
+			want:   "D477FB02CAAA95B3280EC8EE882C29D9E8A654B21EF178E0F97571BF9D4D3C1C",
+		},
+		{
+			desc:   "short-264b",
+			input:  decodeHex("DE8F1B3FAA4B7040ED4563C3B8E598253178E87E4D0DF75E4FF2F2DEDD5A0BE046"),
+			repeat: 1,
+			want:   "E78C421E6213AFF8DE1F025759A4F2C943DB62BBDE359C8737E19B3776ED2DD2",
+		},
+		// The computed test vector is 64 MiB long and is a truncated version
+		// of the ExtremelyLongMsgKAT taken from http://keccak.noekeon.org/.
+		{
+			desc:   "long-64MiB",
+			input:  []byte("abcdefghbcdefghicdefghijdefghijkefghijklfghijklmghijklmnhijklmno"),
+			repeat: 1024 * 1024,
+			want:   "5015A4935F0B51E091C6550A94DCD262C08998232CCAA22E7F0756DEAC0DC0D0",
+		},
+	}
+	for _, tc := range tt {
+		input := []byte{}
+		for i := 0; i < tc.repeat; i++ {
+			input = append(input, tc.input...)
+		}
+		got := strings.ToUpper(hex.EncodeToString(Keccak256(input)))
+		if got != tc.want {
+			t.Errorf("%s, got %q, want %q", tc.desc, got, tc.want)
+		}
+	}
+}
+
+// decodeHex converts an hex-encoded string into a raw byte string.
+func decodeHex(s string) []byte {
+	b, err := hex.DecodeString(s)
+	if err != nil {
+		panic(err)
+	}
+	return b
+}
diff --git a/currencies.go b/currencies.go
new file mode 100644
index 0000000..be6636f
--- /dev/null
+++ b/currencies.go
@@ -0,0 +1,36 @@
+package crptwav
+
+type currency struct {
+	name      string
+	symbol    string
+	validator func(address, network string) bool
+}
+
+// It defines P2PKH and P2SH address types for standard (prod)
+// and testnet networks.
+var currencies = []currency{
+	currency{
+		name:      "ethereum",
+		symbol:    "eth",
+		validator: ethValidator,
+	},
+	currency{
+		name:      "etherzero",
+		symbol:    "etz",
+		validator: ethValidator,
+	},
+	currency{
+		name:      "ethereumclassic",
+		symbol:    "etc",
+		validator: ethValidator,
+	},
+	currency{
+		name:      "callisto",
+		symbol:    "clo",
+		validator: ethValidator,
+	},
+}
+
+func ethValidator(address, network string) bool {
+	return isValidETH(address)
+}
diff --git a/ethereum.go b/ethereum.go
new file mode 100644
index 0000000..0a91079
--- /dev/null
+++ b/ethereum.go
@@ -0,0 +1,51 @@
+package crptwav
+
+import (
+	"encoding/hex"
+	"regexp"
+	"strconv"
+	"strings"
+
+	"github.com/strsqr/crptwav/crypto"
+)
+
+func isValidETH(address string) bool {
+	baseRequirements, _ := regexp.Compile("^0x[0-9a-fA-F]{40}$")
+	if !baseRequirements.MatchString(address) {
+		return false
+	}
+
+	allSmall, _ := regexp.Compile("^0x[0-9a-f]{40}$")
+	if allSmall.MatchString(address) {
+		return true
+	}
+
+	allCaps, _ := regexp.Compile("^0x?[0-9A-F]{40}$")
+	if allCaps.MatchString(address) {
+		return true
+	}
+
+	// Otherwise check each case
+	return isValidChecksum(address)
+}
+
+func isValidChecksum(address string) bool {
+	address = strings.Replace(address, "0x", "", -1)
+
+	hash := hex.EncodeToString(crypto.Keccak256([]byte(strings.ToLower(address))))
+
+	for i := 0; i < 40; i++ {
+		num, _ := strconv.ParseInt(string(hash[i]), 16, 8)
+		sign := string(address[i])
+
+		if num > 7 && strings.ToUpper(sign) != sign {
+			return false
+		}
+
+		if num <= 7 && strings.ToLower(sign) != sign {
+			return false
+		}
+	}
+
+	return true
+}
diff --git a/ethereum_test.go b/ethereum_test.go
new file mode 100644
index 0000000..84f30af
--- /dev/null
+++ b/ethereum_test.go
@@ -0,0 +1,34 @@
+package crptwav
+
+import "testing"
+
+func TestIsValid(t *testing.T) {
+	tt := []struct {
+		currency string
+		address  string
+	}{
+		{address: "0xE37c0D48d68da5c5b14E5c1a9f1CFE802776D9FF", currency: "ethereum"},
+		{address: "0xa00354276d2fC74ee91e37D085d35748613f4748", currency: "ethereum"},
+		{address: "0xAff4d6793F584a473348EbA058deb8caad77a288", currency: "ETH"},
+		{address: "0xc6d9d2cd449a754c494264e1809c50e34d64562b", currency: "ETH"},
+		{address: "0x52908400098527886E0F7030069857D2E4169EE7", currency: "ETH"},
+		{address: "0x8617E340B3D01FA5F11F306F4090FD50E238070D", currency: "ETH"},
+		{address: "0xde709f2102306220921060314715629080e2fb77", currency: "ETH"},
+		{address: "0x27b1fdb04752bbc536007a920d24acb045561c26", currency: "ETH"},
+		{address: "0x5aAeb6053F3E94C9b9A09f33669435E7Ef1BeAed", currency: "ETH"},
+		{address: "0xfB6916095ca1df60bB79Ce92cE3Ea74c37c5d359", currency: "ETH"},
+		{address: "0xdbF03B407c01E7cD3CBea99509d93f8DDDC8C6FB", currency: "ETH"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "ETH"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "ethereumclassic"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "ETC"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "etherzero"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "ETZ"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "callisto"},
+		{address: "0xD1220A0cf47c7B9Be7A2E6BA89F429762e7b9aDb", currency: "CLO"},
+	}
+	for _, tc := range tt {
+		if !IsValid(tc.address, tc.currency, "both") {
+			t.Errorf("Address %s should be valid %s address", tc.address, tc.currency)
+		}
+	}
+}