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 0xd81121993e2efc4a3a013590681b76d72272d504a0160b4983899640bcca4c6d. 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/2fd2a5bc-7d1f-41a8-818d-81ebf395e645.json and https://artists.proofprofile.net/proofs/artist/2fd2a5bc-7d1f-41a8-818d-81ebf395e645.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 0x04f09ae2e268b7fffcafbb5e4c895343a9416e8af38122cc1f0532627e487229. 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/BCGNJ2400008.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a68fd7d531e9af067a41a3e37d5c22cc9a97f9a8488ad8b67d77b4010bcbb3d. 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/BCGNJ2400020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653da530839d636ba52f9145218b82ab830a63b50ebe2e5316048cf609ad96a4. 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/BCGNJ2400022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a01fdaab8f38ba86ed25ef1396d241952cc595450a5d8b7697c4ac40855a861. 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/QZ5AB2484249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb590cc5c9c80126c2dec36405e19a7e4a13a8c98525698972b1fb7ad5b00ed91. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/BCGNJ2400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f1677a2e648bb21ab9e4644393780fe3d76fa5d983e87e4f689c0413bce04f. 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/BCGNJ2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83c3717262067d7f57e3095396089c18a8adc210753f0187c64f2e742d8c42af. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/BCGNJ2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89497a244fe70b5bc6abb0c36733758a2cd793936581b1a7468c25c4b2c1c87. 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/BCGNJ2300081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d31d4d4f886540e454070de4ec98644f270d802e9fcab1339e59097446e5c52. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/BCGNJ2300076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fe1d2334d43086f2af2efe13b9ac677c8e28fc34b5b53604c873a11c0a2d7d1. 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/BCGNJ2300077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3150008d3b4d161ed77776bcf37ceeb64034adf181cc3834f45aa4c06517a3c1. 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/BCGNJ2300072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc50543e7f185d144f42cc183160de2d5eba97ff0ab027d737ddbdf7a611a107e. 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/BCGNJ2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926f7b8aa41d563dc455359bb68d879c48aef462a44b1128625888da690d812b. 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/BCGNJ2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x160b75637ed1a99c97d9e60bd8bf583e848ee86d0f2935defbdeaa812f816bf7. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BCGNJ2400114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc864be167bc5fc14527b5373027fc2d6234e9d8f7d6918d7d06649b74ae72ab3. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BCGNJ2400131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d07dd5f2b363460a711fe85072294e13419c238e78a611a8935b61a40d7b32. 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/BCGNJ2400121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4c7762f414e37ef8f9291a4f119d41db9bf5d1ac340dc17037884ac523adecb. 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/BCGNJ2400073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86a0ae92865cefa8e82ff188801c853fd63db856c3f496495a00a25d293e1ede. 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/BCGNJ2400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cfbe6ac3b00ea1c1025373eeb4519de6e265a84d53ae52056e59b10a9432147. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BCGNJ2400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf02cc7e30588a7b79299dae77dc07da2d282d8e4b46f7c728ec8ec76e874d5c. 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/QZTPX2403632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbb6c9be2a6ba05a4adba82b1deaf1d17e81d34410301edee30a4a9a5005ece. 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/BCGNJ2400042.