Cité may refer to: Places Cité (Paris Métro), the metro station on the Île de la Cité Cité (Quebec), type of municipality in Quebec Citadel, the historical centre of an old city, originally fortifi
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 0xb5032ce123ca19a86c1064933bedf61505739e7823963a53a2309f4b2e0c7685. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/edc6c980-980c-4c0a-b5a1-b90fa12694d8.json and https://artists.proofprofile.net/proofs/artist/edc6c980-980c-4c0a-b5a1-b90fa12694d8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).