Error signing transaction for DynamicDerivations EVM wallet

[pgolovkin]

Description

Error when try to sign transaction for Polkadot Vault Dynamic Derivations wallet.

Steps to Reproduce

1. Add EVM wallet via Polkadot Vault, using Dynamic Derivations flow
2. Try to sign any transaction

Expected Behavior

Successfully signed

Actual Behavior

Errors:
Out of range decoding Compact<u32>
from branch - fix/dynamic-derivation-crypto-type
Could not decode MultiSigner variant doesn't exist

Environment

novasamatech/nova-spektr@c1caded

Polkadot Vault - release 6.3.1

Root cause analysis

When the regular (not Dynamic derivation) evm transaction is signed everything works as intended.

When the evm transaction with DD (in our test case it's Moonbase Alpha) is signed it fails.
According to PV rust code and conversion function we should pass 20 byte address that cannot be derived from Root public key that has SR25519 cryptography.

Best option for us is to request PV a feature to support SR25519 Root key as input no matter what crypto type we pass in the payload.

[pgolovkin]

Nova Spektr issue novasamatech/nova-spektr#2857