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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdefa4545a07a162139cd6ee349c7413c5116b3f4c0a0010b07372f3652b6df6d. Chain 2 (Bitcoin): anchored in block 953933 (2026-06-16T11:13:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e46cb2e-e7c7-4773-bdf1-995c404d517f.json and https://artists.proofprofile.net/proofs/artist/1e46cb2e-e7c7-4773-bdf1-995c404d517f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Haydn: The Creation, Hob. XXI:2 (Excerpts Arr. A. Wranitzky for Narrator & String Quintet)