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 0x648f4203623695048afec6099f3fb83bd859fb55ad11ede5e1886e04be51692e. 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/b89314d6-bddc-4581-a138-406acaf559dc.json and https://artists.proofprofile.net/proofs/artist/b89314d6-bddc-4581-a138-406acaf559dc.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Andrew Kennedy Sings Arias by Mozart, Gluck & Berlioz
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 0x1e60f9ade0d65d629577846f7f06f26fe0c54e335426b3240f4f90d758eec91d. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/GBLLH1018907 — a six-check JSON result.
Britten: Saint Nicolas, Hymn to St Cecilia & Rejoice in the Lamb
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a11e10dd0313c2268f5050c5cb03571dbbfb16bb97383909df9361c2e58af7d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBMY51300301 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa68d641b87868c809e49bd35dec988cb7439e479ff251081fb1e86a14db87f1d. 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/GBMY51300302 — a six-check JSON result.
Saint Nicolas: III. Nicolas devotes himself to God
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51bd3d94a111dc032a06d23bd555d953a8b335b7666acc881556e31f8293973e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBMY51300303 — a six-check JSON result.
Saint Nicolas: IV. He journeys to Palestine
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5076f37d1a492e10ef8513db3ebcfef80afa4bc6ce2142b244d7a936dd3381d6. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/GBMY51300304 — a six-check JSON result.
Saint Nicolas: V. Nicolas comes to Myra and is chosen Bishop
Cambridge University Musical Society Chorus
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c12dc7ed874c674fb79e5f778606efc3ba2ce78802022ccaad0e3aa132b1171. 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/GBMY51300305 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8b2d58ef4a436d7140f7a4af1cb8171c52b8f8e24538de5a9b85c698869ce2b. 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/GBMY51300306 — a six-check JSON result.
Saint Nicolas: VII. Nicolas and the Pickled Boys
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e33f0ea628405f7c507a48f53f1be8a5fe889ae0ad82c6fdd574679f695768f. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBMY51300307 — a six-check JSON result.
Saint Nicolas: VIII. His piety and marvellous works
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17432a7af0876d8a3bdf7801c301c8efcf52c58d20bb1586fbe5a2d1889a9d10. 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/GBMY51300308 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe6b260d00ae9e397195bd3162a45e83f1a72c64fbba9bbcf113285e891457c. 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/GBMY51300309 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b376f1047726757faaf82b3db6eb8446d88ffa057dd663967cee6e61c0849c7. 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/GBMY51300310 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f79095be29384c13d431e36075f627430c10e8b3f1e1f8e883fdcd222029af. 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/GBMY51300311 — a six-check JSON result.
Britten: Billy Budd, Op. 50, Act 1, Scene 1: "Pull, My Bantams!" (First Mate, Sailors, Second Mate, Flint, Bosun, Midshipmen, Donald, Novice, Maintop, Squeak)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5deb38f6f609de20afdeef90e5e8ac0879899cab49ad165f7b8616afbedd7d35. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBAYC0801583 — a six-check JSON result.
Britten: Billy Budd, Op. 50, Act 1, Scene 1: "Come Along Kid! Come Along!" (Novice's Friend, Novice, Sailors)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cb9aafe3b14589ad390240123c4a1d185ead232291020e9794210875fe71687. 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/GBAYC0801589 — a six-check JSON result.