opendlt_accumulate 2.1.0

Production-ready Dart SDK for Accumulate blockchain. Multi-signature support (Ed25519, BTC, ETH, RSA, ECDSA), SmartSigner API, complete V2/V3 protocol.

Changelog

All notable changes to the opendlt-accumulate Dart SDK will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

2.1.0 - 2026-02-27

Added

• Binary encoding for BurnTokens, BurnCredits, WriteDataTo, LockAccount, UpdateKey, UpdateAccountAuth, and TransferCredits transaction types
• fromJson factory on AccountAuthOperation and KeyPageOperation for deserialization
• Testnet faucet example

Changed

• Moved ad-hoc test/debug examples from example/v3/ to example/flows/

2.0.2 - 2026-02-07

Fixed

• Fixed and verified all v3 examples against Kermit public testnet
• Modernized Multi-Signature Types example with SmartSigner and UnifiedKeyPair
• Updated QuickStart and AccumulateHelper examples for Kermit endpoints
• Removed duplicate custom tokens example

2.0.0 - 2025-12-30

Added

Multi-Signature Support

• RCD1 (Factom-style) signature support with proper public key hash computation
• BTC (Bitcoin secp256k1) signature support with compressed public keys
• BTCLegacy signature support for legacy Bitcoin compatibility
• ETH (Ethereum secp256k1) signature support with Keccak-256 hashing
• RSA-SHA256 signature support (2048-4096 bit keys)
• ECDSA-SHA256 (P-256/secp256r1) signature support
• TypedData (EIP-712) signature support for Ethereum typed data

Cryptographic Key Pairs

• Secp256k1KeyPair for BTC/ETH operations with compressed/uncompressed support
• RsaKeyPair with PKCS#1 DER encoding/decoding
• EcdsaKeyPair for P-256 curve operations
• RCD1KeyPair for Factom-compatible signing
• UnifiedKeyPair wrapper for polymorphic key handling

Smart Signing API

• SmartSigner class for automatic signer version tracking
• signSubmitAndWait() method for complete transaction lifecycle
• addKey() helper for key page operations
• Automatic retry logic for transient network errors

Key Management

• KeyManager class for key page state queries
• KeyPageState model with keys, thresholds, and credit balance
• Support for UpdateKeyPage operations (add/remove/update keys)

Transaction Builders (TxBody)

• createToken() for custom token issuer creation
• createKeyPage() for key page creation
• createKeyBook() for key book creation
• issueTokens() / issueTokensSingle() for token issuance
• sendTokensSingle() convenience method for single-recipient transfers
• addCredits() for credit purchase operations

Protocol Types

• Complete signature type hierarchy matching Go core
• Vote, Memo, and Data fields on all signature types
• TransactionHeader with Metadata, Expire, HoldUntil, and Authorities fields
• Proper enum values for all 16 signature types

Changed

• Signature type enum values now match Go protocol exactly
• Binary encoding for signatures uses correct field ordering
• Transaction hash computation matches Go core implementation
• Public key hash computation varies by signature type (as per protocol)

Fixed

• ETH signature public key hash uses Keccak-256 (not SHA-256)
• RSA signatures include full public key in hash (not truncated)
• RCD1 signatures use double-SHA256 for public key hash
• Transaction ID extraction from multi-response arrays
• Status parsing handles both string and map formats

Security

• No hardcoded keys or secrets in library code
• Test vectors use well-known public test data only
• Removed debug files that printed sensitive data

1.0.0 - 2025-09-01

Added

• Initial release of production-ready Dart/Flutter SDK
• Ed25519 cryptography with bit-for-bit compatible signing
• LID/LTA derivation matching Go/TypeScript implementations
• Transaction builders for common Accumulate v3 operations
• Unified v2+v3 JSON-RPC client
• Comprehensive test suite with cross-language validation
• Golden file test harness for encoding compatibility
• Working examples for all common workflows
• Pure Dart crypto implementation (Flutter/web friendly)
• Enhanced transport with retries, exponential backoff
• CLI tool for keygen, query, and submit operations