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Changelog

All notable changes to Observer Protocol will be documented in this file.

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

[1.3.1] - 2026-03-30

Documentation

  • Published comprehensive whitepaper v1.3.1 covering DID/VC architecture
  • Documented W3C standards compliance (did:web, VC/VP formats)
  • Added detailed protocol architecture and economic model sections
  • Clarified OP/AT separation of concerns

[1.1.0] - 2026-03-30

Added (DID/VC Rebuild)

  • W3C Decentralized Identifiers (did:web) — All principals (agents, organizations, OP itself) now use did:web DIDs

  • DID Document resolution — /.well-known/did.json, /agents/{id}/did.json, /orgs/{id}/did.json endpoints

  • Key rotation support — Update keys without changing DID, preserving attestation history

  • Historical key verification — Verify VCs signed with rotated keys

  • W3C Verifiable Credentials (VCs) — All attestations issued as VCs with Ed25519Signature2020 proofs

  • W3C Verifiable Presentations (VPs) — Agent-carried portable evidence bundles (VACs)

  • Selective disclosure — Agents present contextually relevant VC subsets

  • Stateless VP verification — POST /vp/verify requires no DB lookup

  • Option C: Agent as Evidence Carrier — DB is cache only, VP is authoritative record

  • Organization hierarchy — OrgMembershipCredential VCs for org→agent relationships

  • KYB provider integration — Verify credentials from any did:web KYB provider

  • Trusted issuers registry — Pre-approved KYB provider DID list

Changed

  • Identity model — Replaced public_key_hash with did:web DIDs
  • Attestation format — Summary-stats VACs replaced with W3C VC/VP
  • API endpoints — New DID resolution and VP verification endpoints
  • Database schema — Migrations 003 (DID columns) and 004 (VP cache)

Migration Notes

  • Agents registered before v1.1 without stored public keys require re-registration to receive DIDs
  • Existing attestations remain valid and will be migrated to VC format

[1.0.0] - 2026-02-22

Added (Initial Release)

  • Observer Protocol mainnet launch — First publicly verifiable agent payment infrastructure
  • Agent registration — Public key-based agent identity
  • Attestation framework — Six-level trust scoping (0-5)
  • Multi-rail support — x402/USDC Level 3, Lightning L402 Level 1-2, Nostr zaps Level 2
  • Organizational attestations — Enterprise identity and KYB integration
  • Webhook delivery — Real-time attestation event notifications
  • First A2A payment — Cryptographically verified agent-to-agent payment (Vicky → Maxi)

Technical

  • FastAPI-based API server
  • PostgreSQL database for attestation storage
  • Ed25519 cryptographic signatures
  • Cloudflare tunnel for public API access

Future Releases

[1.2.0] - Planned

  • Lightning/L402 Level 3 automated preimage validation
  • OpenTimestamps Bitcoin anchoring
  • DelegationCredential for full org→employee→agent hierarchy
  • Multi-stakeholder technical steering committee

[2.0.0] - Future Directions

  • ZK-SNARK selective disclosure
  • Federation protocol for multi-instance OP deployments
  • did:btc support for high-assurance anchoring
  • HD key derivation standard for enterprise agents