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 0xe196220778dbd545fa5c48c8d04137625197cf0272f45be59c710472ad3903fe. Chain 2 (Bitcoin): anchored in block 954346 (2026-06-19T03:51:26Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/965d2f69-e3d3-48e0-8114-0a6a2e02af88.json and https://artists.proofprofile.net/proofs/artist/965d2f69-e3d3-48e0-8114-0a6a2e02af88.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
In Nativitate Domini N[ost]ri Jesu Christi Canticum, H. 421
Charpentier: Messe de Minuit - In Nativitatem Domini Canticum
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 0x9f76d55568bc680d58c236e56dd5f06273b95e53e2a6c8f5c7a9767ec93b7105. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR7JM2293040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb19c9c70d9d6178427b42804d1b43b51d838d711620e9741a4d353ab0752cc7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR7JM2293070.
Noël sur les instruments, H. 531: Laissez paître vos bêtes
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68642b5c2d5725228a922bda2288437d51345bb1b03706c8a72e0de4746a21b3. 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/FR7JM2293100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00e0a35936d33e4dfbb0a98fa524cd8d01e5ec26bd236994b58e525e7d2dc79. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T19:27:41Z), 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/FR7JM2293050.
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 0x1911fea9c801ddd9ed2b1f9291e066763370e0250f9cf99f8823ad96891e7a29. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/FR7JM2293120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafee4892ff39297f79ec807d3e20fcce6b49402278f3dcac4e0a62e1306d3dc4. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2293010.
In Nativitatem Domini Canticum, H. 416: Praeludium. Usquequo avertis faciem tuam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0787838c9b770ac2c1775dfcd06434c58ee205b017a506be276ac47b61e76500. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2293020.
In Nativitatem Domini Canticum, H. 416: Nuit - Réveil des bergers - Cæli aperti sunt
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a08ebe94b1298844b6187d40684e7d4ecb19202c3562152ae66efc3d7e0238. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2293030.
Noël sur les instruments, H. 534: Joseph est bien marié
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae96c9b718a298131d0ebff77a0290ed4a476294c223e4b4110cef4ca6531076. 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/FR7JM2293060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe839f00fce6ad11e31f449da2a474e0aa941de05c07e459036e1cb4d7dcab870. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/FR7JM2293080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f4adae0a7b80b9d8c8b132f076dfc847b30aaa8f96379bfe22d0c4a09f130f. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/FR7JM2293090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1798f47aa68c9b916304c943f9802c295d7cf09690a4ca405e13b07160ef667b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR7JM2293110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b469d35efc82425844a261b6be5503c6bd265a8ef75f647172f01b5c7a7c281. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/FR7JM2293130.