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 0x376be9101864f61191ca6e36c8af639030f801882d074ebc257dbcc50906ca82. 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/fd331cdc-28fd-4ffc-8922-b631044407ef.json and https://artists.proofprofile.net/proofs/artist/fd331cdc-28fd-4ffc-8922-b631044407ef.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schubert: Complete Piano Sonatas, Vol. 5
Massimiliano Damerini plays Schubert; Piano Sonatas D. 537, 566, 571, 575, 769a & 840
Massimiliano Damerini collection, volume 3; studio recordings, Genova 2018