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 0x8cebb00a9660d1804dfa2f0f4fe5654242938d1741ee24df92ffe0231a63dae4. 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/77f0ef2e-0dae-4561-a124-91a85148e27a.json and https://artists.proofprofile.net/proofs/artist/77f0ef2e-0dae-4561-a124-91a85148e27a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x9d42a95dc518ea87e686a8c2ac260aeff60e08e16916ed364e0bc6a7137ab2c7. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/IT1071600205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x375be4c5d3177e65c936b446640e40dfa188bc1b93200b1d7641a467be415516. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/ITZI71800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cadcca55aa978efeaa792857e2b82097a4604097cf0f8a71e5927a2e6094429. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ITZI71700037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5bdb688b814d4b1c66fe1e29664199175ceb7f510b0eb827397e7beaa29f712. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/ITZI71800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dd296e4a7a035fb217a495f66fc30d27d66213f7b13ae7f793eb68b99deea70. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/ITZI71800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x051aaa1cf60da2d7e1a579dda2f4c9d48e073bf5b9413220f7f7feceb6b82ebd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITZI71800031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafb5ad00613cc956bc0d7a3b78983f1dd34656eabcb637cf3327f291a00dd73e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITZI71800035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbf2aa923bf5b2c4df5dd7fe6b290672cf0c4871f0f35900526a9eeb99463130. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/ITZI71800054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bb90872184404cbc31da41165eebae58949102092a7fc87e23e041ca7c75776. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/IT6KZ2000055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbd9567b3dd70c22d32742c62a2fff81f900089fdab628a516af0144b8ac6db5. Chain 2 (Bitcoin): anchored in block 958703 (2026-07-19T08:36:12Z), 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/IT6KZ2000093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5370aeccebd19a1326b678c0c6d1a944e34454b5b46e98899e0a8ab65dd95927. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/ITTL52130464.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb0791a66e2bc83f968210cb28b233274f1b74b0dcf472210f656d72fcc8d9d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/ITK192300018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57d70330de77200b5a2699d866e43efb82a391b556e2cb1448543a68c851ef9. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ITK192000091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5244a1bc7e29d76190a46e0121746fe4748c4b5594bba9cc4ab220faa7b113. 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/ITK192100173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc5e517e1ca8d769cf59533a40af8e365eb65b0ea22c4c2d611c1fad21ff6f6. 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/ITK192100177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb789bcf22a0724a9186defb80f6d31518f214c59f5e769d5c51f3eff2bde14a2. 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/ITK192100181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb6f778c12ca2e3b027aed036a758e3f9c15c7557b2c7797fb2506c8c1619229. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/ITK192200180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2802f121ce38a1e413ff7a02cadf26df50e410b46ce5daf67b29bdbd2476207. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/TCAFG2065137.