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 0x021ce2cbbbd1290f48523db05a2820b83e5d7819277f2d5391b305d3f2c262d8. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ebf8169-4bb9-47d0-b498-0cd1c58cfae8.json and https://artists.proofprofile.net/proofs/artist/2ebf8169-4bb9-47d0-b498-0cd1c58cfae8.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Trio for Piano, Flute and Violoncello in G minor, op.63 (J259): 1. Allegro moderato
Weber: Piano Trio Op. 63; Piano Quartet Op. 8
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a1b1e80cfb0f1d3d609b9abeb1e0933041604fccd9bbd020c12a8351b87770b. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/DEF059504091.
Trio for Piano, Flute and Violoncello in G minor, op.63 (J259): 4. Finale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566f1db4e04e53b9f04f5ada4f7ce4660e41193f085c4fe53e7c63f399d2cac4. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059504094.
Piazzolla / Orch. Gupta: Concierto del Ángel: III. La muerte del Ángel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb325b494575447ac6b1321a971a6f085693a9521fb11f381cf21a1f75f72b08e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809813603.
Trio for Piano, Flute and Violoncello in G minor, op.63 (J259): 2. Scherzo. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0df2ebe774f8f331a83c4494ae71051bfb4cfbece3857c6de54f3820d8122f16. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059504092.
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
Trio for Piano, Flute and Violoncello in G minor, op.63 (J259): 3. Schäfers Klage. Andante espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d91ff29b7061b8e9b67170aea42da3f3708e50dbe7118f14ad2de9f87ab7a18. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEF059504093.
Quartet for Piano, Violin, Viola and Violoncello in B flat major, op.8 (J76): 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab36b3f46f388bf2a4a52ac255eb3d0ad4aac02cdc64ba85d202468b1233340. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEF059504101.
Piazzolla / Transcr. Gupta: Concierto del Ángel: I. Introducción al Ángel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f570ed60264d77f73daaefdb3d8a594ac41fbcf24a3a36eb80bc4a198debcff. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DEA809813601.
Piazzolla / Orch. Gupta: Concierto del Ángel: II. Milonga del Ángel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f871b62ff923b6710d41af84d751a0093f4870f18dccc22888b1768cf50090. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809813602.
Piazzolla / Transcr. Gupta: Concierto del Ángel: IV. Resurrección del Angel
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x522b566b6a825e4280788e05a2ffa7869c92336175176b0283332ed981169330. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA809813604.
Quartet for Piano, Violin, Viola and Violoncello in B flat major, op.8 (J76): 2. Adagio ma non troppo - Più moto e con fuoco - Tempo I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x094f222af4c804627ecf920629d967bea42c508212284750b937ef4d2e8e51f7. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/DEF059504102.