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 0xe31d8f8920e615acd709f444c5171f6f611a84a7dcfdc18293f968a60928c992. 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/facaa4cd-e5d5-42a6-b0af-954b7ee6d0ea.json and https://artists.proofprofile.net/proofs/artist/facaa4cd-e5d5-42a6-b0af-954b7ee6d0ea.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0xfdde884a7e9c4461f7746aac3069978f69ef6f8b3abf475d9815fb0327c13750. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551734932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41710a4acf70ad03198a0fc468e69255996a12069eac933a656ea70eb2cb8a73. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/DEA551734933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x248636b298cfd7d2be82fbc4139d29b0eac0a8295da857977f966cef3e70f42b. 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/DEA551734934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa63e7c412b64f852f4703ec9245372ab59303c720c4e0d72c031853b84a94e8a. 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/DEA551734935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22df913850d21a197e867bc069c3e2ee49ec5208b1e8e635b98ec6b93de47708. 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/DEA551734937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005ec178c07f5479701c94aa1290d19f720708016d0fdf3c7a5f0f8a947a67ba. 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/DEA551734938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd13303fd2bc7235a9b56d4c6650acfae588048366e86db3fea459c9cc3fd5f1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551734939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38482df043c5d7eb9457cebebdb0e4bf60cd693f36b7906570df4d0295a654ec. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DEA551734940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3265a11bd71d0275d9c3a9785e7f8bc471e66103b08eba88e6b831f46d7aa3. 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/DEA551734942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe6de988d9d2b3b9cc1fefa2d7507b49429c8a72da45e6a6601016f1d4bed98. 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/DEA551734943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7012e7235ac451e31d77690a28fb0fde91ab3cfe10867ebb40b5a5f219f9772b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551634775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f2a2584cf694e61c5604c015d9cc3050e6c1b30095544eb04afd4572edd74cd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551634776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39619b9d0eb5f9b887f2885e4fa69d6abd1355aba0be9925bad48667521f193f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA551634777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6479589c8db141df31af1851dda5dd8deeca9de6f27b9c0c12bf2935ef9d2f7. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEA551634778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb983bf053c5c328a11422ce2eb3fb74f6a0c8cdca318b7ffce46db0b5790043d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551634779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc95d92c6c0f55adbf74dc36a54fe3affdfa8029856b571d023cbae9a1c50adac. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA551634780.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af4fcee0a360f0775d62cbcd1a2917933c4b0594ae0fdd92a59b141fdbfe2a8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEA551634781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94cc9143e5fc6b85689be837cea251e27696d3ac1ec6bdd7aecf34e31c90a98. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551634782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38df0958016962ddbbfdacb6f90196ae469d8981292ab519437814a8599c4356. 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/DEA551634783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd30e4b228cde59dd44bfd00e5a0eed1e50b8236a4af273a19272ad8fcf6ef700. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/DEA551600057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fc915919e16165cb356f01b3e25aaab1dc701447e067437c7f1b6cee7718669. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEA551600058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9e6364cd1180243be990eef8fcbd76ffaa8c86b55eb38da2493fe0a37243412. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEA551600059.