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 0xc24bf11bc8dba2723de83681f2ddeec1a5f23cb018b5b8b393bd92482ecc41b0. Chain 2 (Bitcoin): anchored in block 954516 (2026-06-20T07:04:44Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a206b970-810c-41a4-b5c0-7418e6bcdf07.json and https://artists.proofprofile.net/proofs/artist/a206b970-810c-41a4-b5c0-7418e6bcdf07.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Piccolo Trumpet Recital: Schafer, Joachim - Vivaldi, A. / Bach, J.C. / Handel, G.F. / Andre, M. / Campion, F. / Loeillet, J.-B.
Trumpet Recital: Schafer, Joachim - Albinoni, T.G. / Handel, G.F. / Telemann, G.P. / Baldassari, P. / Loeillet, J.-B. / Valentino, R.
Trumpet Music - Albinoni, T.G. / Handel, G.F. / Franceschini, P. / Hertel, J.W. / Telemann, G.P. / Manfredini, F.O.
Trumpet Music - Handel, G.F. / Bach, J.S. / Purcell, H. / Stradella, A. / Vivaldi, A. / Biber, H.I.F. / Torelli, G. / Schmelzer, J.H.
Italienisches um Bach (Bach and his Italian Colleagues)
Musik ist der beste Trost - Trompete & Orgel