upright=1.35|thumb|Apostle St. Mark with angels (Venice) __NOTOC__ Year 832 (DCCCXXXII) was a leap year starting on Monday of the Julian calendar, the 832nd year of the Common Era (CE) and Anno Domini
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 0xbf0eb1ad177145fd7306a0c7a85d54a73c3444f7c44995196a1cd5ed03468ddd. Chain 2 (Bitcoin): anchored in block 954008 (2026-06-16T21:31:27Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/330ab6d8-dc03-4ec0-8767-93888557b601.json and https://artists.proofprofile.net/proofs/artist/330ab6d8-dc03-4ec0-8767-93888557b601.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).