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 0xe06aad11b3e5ea2f5b807d515d12a51f688ae4cbbcd72a6941c9d94c8f450d18. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d3f493b1-3dd3-4c30-90ee-15fd27743e95.json and https://artists.proofprofile.net/proofs/artist/d3f493b1-3dd3-4c30-90ee-15fd27743e95.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
'Where'er You Walk': Arias For Handel's Favourite Tenor
Esther, HWV 50a, Scene II: Tune Your Harps to Cheerful Strains
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 0x43610250240e989604dace20197381a5f5e5208ba817d84f94601eaf5ff7da58. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/GBLLH1645701 — a six-check JSON result.
Il pastor fido, HWV 8a: Sol nel mezzo risona del core
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3d7ee81f90be7bc5b546fe585c3ab8464e944276dd36baa1011da1d96fd322f. 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/GBLLH1645702 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2439b388b66212f4aad4d3eaa1977bb08bafdfeb737c1e3fd0566fc78e2a481d. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBLLH1645703 — a six-check JSON result.
Alcina, HWV 34, Act III: Un momento di contento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a54d3aec02a75d8fe214d7cb20b1628e6d1951edcf3b7eeb6a4d7bbdd2eb2b. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/GBLLH1645706 — a six-check JSON result.
Alexander’s Feast, HWV 75: Happy Pair (Aria)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x065a760a15bb45de7e1652769110a0985d5df3d52945493be1f1f7730b9ceea9. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLLH1645707 — a six-check JSON result.
Alexander’s Feast, HWV 75: Happy Pair (Chorus)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59243c48d1cac877e5699235ed498bc256b8bbc03f356c942a5d8aa7bfc4de6f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLLH1645708 — a six-check JSON result.
Berenice, HWV 38, Act I: Vedi l’ape che ingegnosa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc864334a15a6e85ee840ba071caedf3f9d316fa478b294278a8230da0f7cb1e5. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/GBLLH1645709 — a six-check JSON result.
L’Allegro, il Penseroso ed il Moderato, HWV 55: As Steals The Morn
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a30e0defda3962ea245cb9a1b52bfb27c616edfb5a2f09bd3eef8018d2604ac. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/GBLLH1645710 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x264fddc1bffc0369021a4a7065f0818413394db9e547b6945c54b434a52ee45a. 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/GBLLH1645711 — a six-check JSON result.
Solomon: Softly rise, o southern breeze!
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a4c6163bffcae64478bbb88b27644a33e6f3fb51497b79963840d6cfb97a376. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/GBLLH1645713 — a six-check JSON result.
Samson, HWV 57, Act III, Scene I: Thus when the sun from’s wat’ry bed
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250505b9e3f0c537c091b081ba8e32cf01eea41cb3250e083afb67748337e862. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLLH1645716 — a six-check JSON result.
Jephtha, HWV 70, Act III: Waft her, angels
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fceeb2d19ec8a5dd9a83c76c71ca4b28ac0bf4c9afa7bb2d92ebe498c96b5f7. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBLLH1645721 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x238acc5635c60b660337e68e1e3d98e91386dc604df5fb4e4338abe8b0663540. 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/GBLLH1645723 — a six-check JSON result.
Semele, HWV 58, Act II: Where’er you walk
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x337bfefa14ac36d529e02b382799366c2d15c2f79623cb897579ccd23baceecf. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/GBLLH1645725 — a six-check JSON result.
Bastien und Bastienne, K. 50 (Original 1768 Version): Intrada
Mozart: Grabmusik, Bastien Und Bastienne
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x773dbfb67c22ddeb82386d9b3a9303dbb6d5d1a37f8a68fbda889a23083eb529. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLLH1854707 — a six-check JSON result.
Bastien und Bastienne, K. 50: "Diggi, daggi, schurry, murry" (Colas)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f07b45b99f1d9f3c6110353139a1f7913e7c68cd30207dd943ace13e46d6284. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/GBLLH1437303 — a six-check JSON result.
Lucio Silla, K. 135, Act III: "Fra i pensier più funesti" (Giunia)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20714cb7d127e6f01bc01a561392e9533d33ac7640a61f0550ec6d578cb8c2bd. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBLLH1437305 — a six-check JSON result.
Die Zauberflöte, K. 620, Act I: "Hm! hm! hm! hm!" (Drei Damen, Tamino, Papageno)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e8b235d9fe484bcd3e0d27ab7063b2c30c1e0cd446b384349eb9eb962d3f1e. 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/GBLLH1437315 — a six-check JSON result.
Mitridate, re di Ponto, K. 87, Overture: Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf145ef45dd2ce402f0c0dbb78bbe0f626ac234a21408c82be00e62aae0cf9bd8. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLLH1440001 — a six-check JSON result.