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Changelog

All notable changes to this project will be documented in this file.

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

[0.3.0] - 2025-01-01

Added

Multiple hash functions: Support for SHA3-256 (default), BLAKE3, and Poseidon
- blake3 feature flag for high-performance hashing
- poseidon feature flag for ZK-friendly algebraic hashing
Batch proofs: Efficient multi-leaf proof generation and verification with shared sibling hashes
PartialEq and Eq implementations for MerkleTreeAccumulator
Proof validation on deserialization to catch malformed data
Examples: hello_world.rs and hasher_comparison.rs
CI workflows, contribution guidelines, and issue templates

Changed

Complete rewrite using rs-merkle for core Merkle tree operations
Simplified API: Hash::from_data() for leaf creation, generic hasher via MerkleTreeAccumulator<H>
Consolidated hash module: All hashers now in single hash.rs file
Rust 2024 edition with MSRV 1.85
Improved Poseidon performance: Constants cached with LazyLock
Fixed Poseidon entropy: bytes_to_scalar now preserves all 256 bits instead of truncating to 248

Removed

Blockchain-specific dependencies (Parity RLP, NEAR Borsh)
Witness caching (simplified accumulator semantics)
Redundant height field (now derived from leaf count)
HashData trait (replaced with direct Hash::new(H::hash(data)) pattern)

[0.2.0] - Previous Release

Initial public release with basic Merkle tree accumulator functionality.