Year 237 (CCXXXVII) was a common year starting on Sunday of the Julian calendar. At the time, it was known as the Year of the Consulship of Perpetuus and Felix (or, less frequently, year 990 Ab urbe c
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 0xd0ba73f58c91448dc80314c0348b5d5e173a46071225ffca6d10ea3e217033d9. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5d067841-ddd9-46ea-8158-cbc4d9f886a9.json and https://artists.proofprofile.net/proofs/artist/5d067841-ddd9-46ea-8158-cbc4d9f886a9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).