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 0xe56e53bb5775c0293cb17e27c15e969dd67fcc7ba2fb333712dc63450e280e80. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cc1fc378-d0a3-489f-bccc-03e09b14f36d.json and https://artists.proofprofile.net/proofs/artist/cc1fc378-d0a3-489f-bccc-03e09b14f36d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Vivaldi: Farnace, RV 711, Act 2: "Gelido in ogni vena" (Farnace)
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 0xec577a74d593ed2d2d8fde243ff0578678e5a09985aee79a46a47669359ec896. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002239 — a six-check JSON result.
Conti / Orch Orfeo 55: Doppo tante e tante pene: I. Doppo tante e tante pene (Orch. Orfeo 55)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb4e51563254bda8326a855f2727f097eba4818dc4c150b8c110191b0e021ef3. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1702150 — a six-check JSON result.
Conti / Orch Orfeo 55: Doppo tante e tante pene: XVII. Quella Fiamma (Orch. Orfeo 55)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68afc04aeb841511027b8e0f383f1bd1fa103825148b10d699760cee95c36d3. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1702152 — a six-check JSON result.
Conti / Orch Orfeo 55: Doppo tante e tante pene: IX. Dubbio di vostra fede (Orch. Orfeo 55)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de3e39b01e0530c1ba081bb54740ec3e113c6c25e09cff13ac1600f62955cf7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC1702151 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec577a74d593ed2d2d8fde243ff0578678e5a09985aee79a46a47669359ec896. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002239 — a six-check JSON result.
L'Olimpiade, RV725 / Sinfonia: L'Olimpiade: Sinfonia III - Allegro moderato
"An Era of Classical": Vivaldi - Orchestral Works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34a99842a88662e82bbfcace0aebb0a10bc7935a997dcced69ebf0e11c99e33b. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71100042 — a six-check JSON result.
Orlando furioso RV 728 / Act 3, Scène 8: Ritornello (fragment d’un air pour Ruggiero)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9d020133c6432c3bb0f804042e9391f5af75c8e4cc6ef933a30522325601cc4. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRUM71100028 — a six-check JSON result.
Handel: Tamerlano, HWV 18, Act 1: "Dal crudel che m'ha tradita" (Irene)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d2eafce36cef00923e32395c8099afb1685b40c48ae4851d1baa7a81ee6ccb4. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002234 — a six-check JSON result.
Porpora: Meride e Selinunte, Act II: "Torbido intorno al core" (Ericlea)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9be32c68540406d3bdaf117250d4c9e7bae14ba25db79b7a22e3d1259904610c. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002235 — a six-check JSON result.
Handel: Ariodante, HWV 33: Overture to Act II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bbf8d676d01230c2b9953b6e76d4dd2ac59f33337b9eecc21755396b2a25c50. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002236 — a six-check JSON result.
Handel: Rinaldo, HWV 7b, Act II: "Mio cor, che mi sai dir?" (Goffredo)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa81c47d6bceb094f994c7b0465aeac5aa7051baa254738fd366063e1845e9a7c. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002237 — a six-check JSON result.
Vivaldi: Tito Manlio, RV 738, Act I: "Di verde ulivo" (Vitellia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e39c660284baf88f3fc36df82edbae58849fa2c2ec6f4aba8afa81a0ea2363f. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002238 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec577a74d593ed2d2d8fde243ff0578678e5a09985aee79a46a47669359ec896. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002239 — a six-check JSON result.
Handel: Berenice, HWV 38: Sinfonia to Act III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe825840289628f7d9df08df6369c01ec106b2ae43a3d7b5970ed1509258ca4bc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002240 — a six-check JSON result.
Porpora: Semiramide riconosciuta, Act II: "Tradita, sprezzata" (Semiramide)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb5a47c6095937bad44ea3d9e56246089ae82b1c24a71f7812182642bfe6805a. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002241 — a six-check JSON result.
Bononcini: Griselda, Act II: "Caro addio, dal labbro amato" (Griselda)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca358a2a50c8ea3e8e32cbb8496aab338e6447e9fd6b07e35c2cd67a786c1128. Chain 2 (Bitcoin): anchored in block 960193 (2026-07-30T02:05:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002242 — a six-check JSON result.
Lotti: Alessandro Severo: Sinfonia to Act III
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d59df80b97e2b5a685985accb43ad67a3151ae988b677694aa6e0a471ef34ff. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002243 — a six-check JSON result.
Handel: Arminio, HWV 36, Act I: "Sento il cor per ogni lato" (Ramise)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fff7818b04772b258c74d688a6b6d95bd71c6f78bc4c1f1f0cba810e9e1570e. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAYC2002244 — a six-check JSON result.