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 0xa6c7e38c70c2614c9926b720542ea80b2e692d017afe68c63c6065f7f7a5e753. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/decd3148-f35e-40c3-9b5a-e65d9172e21b.json and https://artists.proofprofile.net/proofs/artist/decd3148-f35e-40c3-9b5a-e65d9172e21b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J.S. Bach, Krebs, Pachelbel, & Walther: Organ Works
La scuola organistica del XVII secolo, Vol. 1
La Scuola Organistica del XVII Secolo, Vol. 2
La Scuola Organistica del XVII Secolo, Vol. 3