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 0xf7304a9d25d72d2910bb2fd130fae7ea21cf76aacf89b393c943a47b960cae17. 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/e008db9d-731d-4062-9757-4b51f1dccc62.json and https://artists.proofprofile.net/proofs/artist/e008db9d-731d-4062-9757-4b51f1dccc62.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 0x1c5b3b5114c7b3693fda23f27526bd4f7c502898343e89a871797aa78ef79a6f. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/BXTQW2400010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x321155dbf6747fe2b759cb9c0045ab61b13a5e06d0a8a0cdc93a240682383cf3. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/BXTQW2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa12b80e04faa0127902a7f4ef2513a3d0bf37353be3297c085ae836c35a418e2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BXTQW2500068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c05b865463a2df8895248ee5f4d56b03f64a89fb5f46e10a4596078f46f820. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BXTQW2500122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa5e8cce8a111d9fb093e4a566f6cc4b0e93e21b38834d08de70067cc8a9d205. 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/QZZEB2321124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f75b24cf90fa2ed9c111b59dcac152d17b699c33220d2b7f71879aee4f61c52. 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/QZZEB2321562.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77fbdd921ce3224f1bb46ccf58e22ab01b77f0dfe8a2f756c429b96c2f605871. 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/QZHZ32216637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0b2df5067a661bc52417a08f46c406980be7b50f4cd319d714469d361564309. 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/BX43S2000044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0da7de7f8ec5452ff503968c42526be832080fff0507043f1f3f5d8e98ec7d2b. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/BX43S2000046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfacb0934941d1c99800c8dd2842d3ead6bdd5c75fd5272fb77daef8de9d404. 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/BX43S2000047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02b8e16e1962c40dcae9267c81f73a594390310240ebc7a202f229c400df14a9. 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/BX43S2000048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ecaeb1de81fe27203fee40cfd921887d6f4a9ee7c784081529f8cbbc2fff868. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/BX43S2000049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacef71e55c73a0a0e5fcd418b608c74d1a7267162ab65e875b417ebd72d34b52. 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/BX43S2000050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c8f23e10ff045296b5052541773d4bac7625badeb9e89120abbf1ba48381ed. 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/BCUUZ2200036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56fca63970454f92443fe4703eec60650e11e1f053f0ad7c9bb63d867467853e. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZNJV2036073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b7108c0421cb9349a80e8404c8e2635d0fb39dbf248da2eb93708d5bd3f28e8. 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/BX43S2000028.