AFD or AfD may refer to: Government Alexandria Fire Department, in Virginia Anaheim Fire & Rescue, in California Austin Fire Department, in Texas French Development Agency (, ) Online media Adu
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe684561ee6d31a8ce32031c06d6e37d251a61a781f5a261bbc16cc470a707e52. Chain 2 (Bitcoin): anchored in block 953714 (2026-06-15T00:43:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/809e6222-2622-45d0-989a-0e5fa63ffea2.json and https://artists.proofprofile.net/proofs/artist/809e6222-2622-45d0-989a-0e5fa63ffea2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).