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 0x791b3545683a346b9643e19d0c075969e82d104dfa207b75b843ed076c9db333. 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/750bfd69-1b8b-4836-9322-1e54475b94bc.json and https://artists.proofprofile.net/proofs/artist/750bfd69-1b8b-4836-9322-1e54475b94bc.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 0x0e0a240aaa93e3fcfcd32cad7ef482a3297b615d5becd90d3e5d2ca80fe875d0. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/COAA51900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf52e739583afdbcfeb0c2e914b83b91a1e61e3340c71d80cb1ca143fac609cd6. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/COF010900677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4b4e40555e1c12c49a816cc6e122ccf83fe554809aa81c5b2324f68599ccdc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/FR2X41416522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4b4e40555e1c12c49a816cc6e122ccf83fe554809aa81c5b2324f68599ccdc. 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/FR2X41416522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba4b4e40555e1c12c49a816cc6e122ccf83fe554809aa81c5b2324f68599ccdc. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/FR2X41416522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52907d3647ef340463f5806f8bdad01fd14100065c2bbfe0163a1d79db8e2db6. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/FR2X41416524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc013a969011b9859154c37748a4ace839e3ffcf21da82a52799cbc52d65e9764. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T19:55:52Z), 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/COF010700636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1adb9ad146ddb13061120b951fb8b0282f223bbc443cf755732095641eacd2a. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWDW2350240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13178feee748b8a3c2d1441d92428f738d26f5a15ad9c0cbd12fd3ef98bb374. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZYFZ2392278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe13178feee748b8a3c2d1441d92428f738d26f5a15ad9c0cbd12fd3ef98bb374. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZYFZ2392278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e515a462d7b6baaa3f3e8b474b26a1e20e520601b21677b6189c996a5de18b1. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T10:48:47Z), 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/QZWDW2473502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x886f8d4f37919b59b38748cbf7373072b07b8dd7837d8ac4dc4035ab939eba94. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZWDW2561261.