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 0x5c734320233e4d25a7632ba13ac8f6daaca8b4498a73248f91b1e9c6383e761c. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a71e9706-514e-423d-93d5-2a5cb02d1b95.json and https://artists.proofprofile.net/proofs/artist/a71e9706-514e-423d-93d5-2a5cb02d1b95.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
La Petite Naples, Vol. 2 (Opération sultan)
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 0xb3eac0442ef1305c4ff5dd9990c6058b4703461fb7a416b54c8912503c0b43c1. 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/FR9W12300012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03749e6a1a033f46f6e8e69937ccff89b1d8f35ce249ae7255b8f4edcd259dbe. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR9W12300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56832ab8628b1e59f739fe60d3b8fd01ea67c301b7630c2b291a2bc630027e66. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CH6541650514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a908295dec0d5dfa6772c58f7a8cb31dac6fe0596d33b8c27bd5b56ce0a3999. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH6541650515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa267914297627c3c9f2edf9a2e5cae4e6cd2bf85efd5539021c3b138415dd5df. 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/CH6541650516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d58c428881bd84e5bc5476d20a013d41c4de48586b83c95019fd6ae802ed6a6. 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/CH6541650520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadf74eb316e36a090222d2b6f21333dc6dffc2d65d6bfbe8516ffae12cc53fb7. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH6541650518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a5a9d4767d443f77e33729f19edd0c1684f4f097fe83cc156b91b9363292e73. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH6541650517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24a7d86cc6a98a3bacbbefeeb7c35e0dc847d57c48e9a050da33c131264a9bd5. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/CH6541650519.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08a6a0df2c5e05a13a25d8efd87204202c7aeacf807c3b42235d024699de5af0. 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/CH6541650521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b235f685836e71338b7bd3b8eabaf087f4229036fc0cb167667c2f9c7cf7d4f. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/CH6541654742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0158225fd0e04d07465e76be2d239f279f89eaf9fb5ed78c2a5ffec495c25613. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/CH6541654745.