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 0xe48a41da274aad1fe052701653a7cc629b03ead9d6c747872efcc2126716e313. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e3fc3de5-250b-4d19-af70-378cb466e1d1.json and https://artists.proofprofile.net/proofs/artist/e3fc3de5-250b-4d19-af70-378cb466e1d1.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Francesc Pi de la Serra canta les seves cançons - Els setze jutges
Francesc Pi de la Serra I Les Seves Cançons (Vol. 3)