tx_pool: code improvement for EIP-55 check with strict canonical SC address format#400
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… format The bridge SC address in tx_extra is derived deterministically from the sender's spend secret key via secp256k1 -> keccak -> pod_to_hex, which always emits lowercase hex. The previous EIP-55 mixed-case validation could never legitimately fire and contained three defects (8-of-40 char truncated checksum, mixed-case-only gate that skipped lowercase entirely, and a broken digit comparison branch). Replace it with a single regex that requires the canonical "0x" + 40 lowercase hex form the wallet produces; reject anything else outright.
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