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 0xa8d2538a06bf237baa0b2c8824c0f744e652f34f71649aa1b4b0af12c876170e. Chain 2 (Bitcoin): anchored in block 954728 (2026-06-21T18:08:38Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f8aec142-5af8-4617-aab3-58733ffbcc18.json and https://artists.proofprofile.net/proofs/artist/f8aec142-5af8-4617-aab3-58733ffbcc18.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Le nozze di Figaro, K. 492, Act I: No. 7, Trio. Cosa sento! tosto andate - Live
Mozart: Le Nozze di Figaro, K. 492 (Live at House Of Mozart, Salzburg Festival, 2006)
1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp 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 0xac4a65cbdcd5fe70ec89e74619e94175aeeb4462d393cbfce3ff5ab0626691af. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631214.
Le nozze di Figaro, K. 492, Act I: Recit. Ah, son perduto! - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2bce16ea091d14cf717f87b7eacb6c590437a53812dd5b0889ef8edba1873dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631213.
Le nozze di Figaro, K. 492, Act I: Recit. Basilio, in traccia tosto - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7f9ab358017bac5965795bdc89715c336310e2c97346a2fd0ec83495a331ca. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631215.
Le nozze di Figaro, K. 492, Act I: Recit. Evviva! - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21865f71f4dfad5fe8d63ed753323e86784099d375ab23b4e84e31d39e30b83d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631219.
Le nozze di Figaro, K. 492, Act II: No. 16, Finale: h-i. Voi signor, che giusto siete - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70a7005978b8bcda6d74065a4acaf32b81832bddb14851cc3fef8a7d4b71a33f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEN960631237.
"Gente, gente, all'armi" (Figaro / Act 4) - Live
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a928ce078b10c22967b075a1c8975480c51bfebad0d4356c529e1874dc4cb1c. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEUM70704355.
Dixit Dominus, HWV 232: VI. Dominus a dextris tuis
Handel: Dixit Dominus; Salve Regina; Laudate Pueri; Saeviat Tellus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fd3ba83183cdd34c413b4fb23034656037713d3d7eba03cf9aff706454a172. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059804046.
Te Deum for Soloists, Chorus and Orchestra, H. 146: Te aeternum Patrem (Chorus, Soprano I/II, Mezzo-Soprano, Tenor)
Charpentier: Te Deum; Messe de Minuit; Nuit
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04c33346ebdb65c8269c02bd3738269f01e32db49ee3611e37f5f877af8f7a5. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059730203.
Te Deum for Soloists, Chorus and Orchestra, H. 146: Te per orbem terrarum (Mezzo-Soprano, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa65f811177322638afebdfe3b3e3966361d11b0065ca3a84d6a20d3274247df7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059730204.
Te Deum for Soloists, Chorus and Orchestra, H. 146: Aeterna fac cum Sanctis tuis (Chorus, Mezzo-Soprano, Tenor, Bass, Soprano II)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a61eb4e0662e20b2c69d2ca19fb31bd7ec4240528ba6860b3866f62d62c51c8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059730207.
Te Deum for Soloists, Chorus and Orchestra, H. 146: In te, Domine, speravi (Chorus, Mezzo-Soprano, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601bcb09031e9a3ee755227445ee5864cb7ae52ec48ee8b9b61ead67e40df683. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059730210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe850a0db84bb1542efbdbade5005f57d394ec9283e17691650de168a5ffe546d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059730302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45c3cf6ca684471c87a1f227a8264117a560401ea05efe724e7f845860848011. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059730303.