crypto_wallet_util

Crypto & Blockchain Toolkit

This package provides multi-chain address generation, transaction assembly, signing, verification, and encoding utilities for wallet applications. SC transaction support uses the bundled WebAssembly asset by default and also offers a caller-supplied native FFI bridge.

Features

Support wallet:

• ALGO

• ALPH

• APTOS

• BCH

• BTC

• BTCB2

  • aliases: btcb2, xbt

• CKB

• COSMOS

• DOGE

• DOT

  • ED25519
  • SR25519

• ETH

• FIL

• HNS

• ICP

• KAS

  • KAS
  • KLS

• LTC

• NEAR

• SC (sia coin)

  • SCP

• SOL

• SUI

• TRX

• XRP

Support transaction :

• ALGO
• ALPH
• APTOS
• BTC
  • PSBT
  • GSPL
• BTCB2
  • UNIFIED
• CKB
• COSMOS
• ETH
  • EIP1559
  • LEGACY
• FIL
• HNS
• ICP
• KAS
• NEAR
• SOL
• SUI
• XRP
• SC
  • V2 transaction assembly
  • V2 semantic signing and cold-side inspection

Support address check

• BASE32
  • ALGO
  • FIL
• ETH
• BTC
  • LTC
  • DOGE
  • BTC
  • BTCB2
  • BCH
  • BELL
• BECH32
  • COSMOS
    • ATOM
    • KAVA
    • SEI
  • CKB
  • HNS
• KAS
  • KAS
  • KLS
• BASE58 (not fully support)
  • ALPH
• regular
  • SOL
  • ALEO
  • TON
  • APTOS
  • DOT
  • NEAR
  • SC
  • SUI
  • TRX
  • XRP

Sign and Verification:

• Ed25519
• Sr25519
• Secp256k1
• Schnorr

Encoding and Decoding:

• Base32 Encoding/Decoding
• SS58 Encoding/Decoding
• Base58Check Encoding/Decoding
• Bech32 Encoding/Decoding
• Hex Encoding/Decoding
• BigInt Encoding/Decoding

SC V2 semantic signing

ScTransactionBuilder can extract the exact Sia V2 transaction semantics that are committed by InputSigHash, without forwarding Merkle proofs, parent outputs, policies, signatures, or other witness data to the cold side.

import 'package:crypto_wallet_util/transaction.dart';

final builder = await ScTransactionBuilder.create();
try {
  final hotSide = await builder.extractV2TransactionSemantics(
    unsignedV2Transaction,
    changeAddresses: knownWalletAddresses,
  );

  // Transfer hotSide.bytes to the cold side. The cold side parses the bytes
  // again and recomputes the digest through the pinned Sia core implementation.
  final coldSide = await builder.inspectV2TransactionSemantics(
    hotSide.bytes,
    changeAddresses: knownWalletAddresses,
  );

  print(coldSide.inputSigHash);
  print(coldSide.externalOutputs);
  print(coldSide.changeOutputs);
  print(coldSide.minerFee);
} finally {
  builder.dispose();
}

The initial sia-v2-siacoin-transfer-v1 profile accepts ordinary siacoin transfers only. Unsupported V2 transaction categories, malformed or non-canonical payloads, missing required fields, zero-value outputs, and out-of-range input/output counts fail closed. Canonical semantic bytes are limited to 32 KiB so every successful extraction fits the SC V2 UR wire contract.

Feature requests and bugs

Please file feature requests and bugs in the issue tracker.