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 0xc0b1d652927df61ae56e8fd82439f18cf93ba55843db77128f9d0810ed2f9495. 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/e6928d06-0f84-4478-98a1-2e644a5ce82b.json and https://artists.proofprofile.net/proofs/artist/e6928d06-0f84-4478-98a1-2e644a5ce82b.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 0x33b86af96c539d684bbd381296ecf324b3cf18e8aad8befdf6d0b9d97a6572b6. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/ATBK71202197.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31b28fb04e2cade3422cd7ea47f2e5094d8304801c66db7c67279b1fd815ae17. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ATBK71202650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1720e49d7563950622eda69b5d8a95db81e232b0094bf6760d4f356961ac147. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/ATBK71202659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759b0568cb51d2420fbfd799b14153ff8b18d389c7e5990e60ea8653089bf9ac. Chain 2 (Bitcoin): anchored in block 958106 (2026-07-15T05:35:13Z), 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/AT1962500212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb876c7b777d07eb687f217eb070e3d46ab6137b496274e9437dfeea8fa6c7cd. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/AT1962500214.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f89a78e93605c9fa3e51dac940d394d58d8a1ee55d4fbeed54b65c881e25f0. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/AT1962500215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c0e7195d1524d699f3284ecf2b1c29253c65a234da2dbbabff5ef97f33e6e0. 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/AT1962500216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e79a87e0912d05d663221a745eb08f3af116a1d72b25ba7c86627263afc72bd. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/AT1962500217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe24924b3bc3f2c99830d69f243fd6b70182ef3c7463e11e211a77dc3e5d41e41. 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/AT1962500219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81f627f8bdc3adca45987a4cbf9e5ad5b47b5a9db148e56f65b3b2a28fafefcf. 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/AT1962500430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2cb0073d3bda63f0215e18f744c5476aa98bcf71e75cf10844fac68ae2a3423. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/AT1962500438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad57249efea77f0b1a61c8e4eed500afd064981fe4460dd408b7543a48b27018. 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/AT1962500439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f1ca5089d9f5ab52a54c34bef6b1296082e93655aabd42df1d0f06b2237bcd. 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/AT1962500913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad558cc2adb0711aa04bfc43af5777aa6b421fcd556d4bd580cca0e312702e3. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/AT1962500914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432427cc83006c1dff77e9842506e27d6ad675160979abb3db6efbf01e5c9962. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/AT1962500917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e3da408887f9a8860b28d363251bbe32eecc42d49ded4c5a98f711c02a75251. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/AT1962500918.