thumb|The Royal Palace of Madrid is the official residence of the Spanish royal family. It is the largest royal palace in Europe, as well as one of the largest in the world. alt=|thumb|The Winter Pala
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 0xcdf8245a848cacf8158f6f7c093105c9af01c9ce2ced27927d4b0cce976acb85. Chain 2 (Bitcoin): anchored in block 954631 (2026-06-21T02:46:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cdddbfc9-c6a3-4e0b-929a-b95bd1362dc1.json and https://artists.proofprofile.net/proofs/artist/cdddbfc9-c6a3-4e0b-929a-b95bd1362dc1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).