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Ledger Changelog

All notable changes to QCOS Ledger are documented here.

[3.2.0] - 2026-02-06​

Added​

  • Batch append: Append multiple records in one transaction
  • Search API: Query records by metadata
  • Retention policies: Configure data retention (Enterprise)
  • Export formats: JSON, CSV, CBOR exports

Changed​

  • Improved Merkle tree performance (3x faster proofs)
  • Better timestamp precision (microseconds)
  • Enhanced audit interface

Fixed​

  • Merkle proof generation for large sequences
  • Timestamp synchronization edge cases

[3.1.0] - 2026-01-15​

Added​

  • Immutable ledger: Core append-only storage
  • Hash chains: SHA3-256 chained records
  • PQC signatures: ML-DSA-65 signing
  • Merkle proofs: Efficient verification proofs
  • Cryptographic timestamps: RFC 3161 compatible

Changed​

  • Integrated with Evidence and ACOS
  • Improved API response format

[3.0.0] - 2025-12-01​

Added​

  • Ledger module: Initial immutable record system
  • Basic append: Record creation
  • Simple verification: Hash verification

Roadmap​

[3.3.0] - Planned Q2 2026​

  • Distributed ledger replication
  • Cross-organization verification
  • Blockchain anchoring
  • Advanced search capabilities

[4.0.0] - Planned Q4 2026​

  • Zero-knowledge proofs for privacy
  • Selective disclosure
  • Multi-party governance
  • Decentralized timestamping

Version Support​

VersionStatusSupport Until
3.2.xCurrentActive
3.1.xSupported2026-07
3.0.xDeprecated2026-03

Data Retention​

PlanDefaultConfigurable
Pro7 yearsNo
EnterprisePermanentYes

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