thumb|HAROLD SACRAMENTVM FECIT VVILLELMO DVCI ("Harold made an oath to Duke William"). (Bayeux Tapestry) This scene is stated in the previous scene on the Tapestry to have taken place at Bagia (Bayeux
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 0x2a3ac9bbebaba215a430dbc554c25d9df966fc291cac7858fbf7d32fe46a711c. 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/e4346f67-f7f8-450f-ad07-eaf999c0232c.json and https://artists.proofprofile.net/proofs/artist/e4346f67-f7f8-450f-ad07-eaf999c0232c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).