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 0x9cec655a43d8091dc4f0cf3184c8311115f9000b1c334d211a8f2195b927bbdc. 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/19a72d3d-cf71-4d7a-9b36-f8431cad42ef.json and https://artists.proofprofile.net/proofs/artist/19a72d3d-cf71-4d7a-9b36-f8431cad42ef.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 0x589dde79654bccca5ea81cbd40ec708197485e56ac4ab34403a8081c6e5673ef. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/FR96X1793402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e1a0d285709ae232a4ade5e900ddea40d9e15d1d1b144b72289127610e2fe3c. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/FR96X1793403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bc5a0c6f88e66da64285dd3195ae470322222ccb544b3175be901fdc209cdd1. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/FR96X1793404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9debfcfcefab4e909f9f1a72560692b23e9515d2de4d8db5adb133e092d430. 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/FR96X1793405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2433a7fb25d31a52bafd906aec6294549a315ad17bc68422f37eaac3acda7742. Chain 2 (Bitcoin): anchored in block 958163 (2026-07-15T14:38:07Z), 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/GBNRN1791371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd80ad7d4faef8f02f03ddc30617c492df13a9568c54851992e56bf5967b7420. 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/GBNRN1791374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41140142ec79deeefc123a10a2b51271880b140de5f6f30c5b04c40ea578eec1. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/FR6V82460903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6898bad9301175f0293824bc2756cd2ba0cad00a25a523b3ef49a6cf8ff558. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/FR6V82226936.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8deae468f4c7e1617114b5df41b36dab3149828542d7d503592a068f6ce1724d. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/FR6V82226937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49e62cbb8276c118a5e81d4938a38a917fd91ace363a0903924161a193de3d88. 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/FR6V82226938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62239a26dbd8cbb53d65b03a3938e04f40880ec0c496bf15267b83f91750b8e3. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/FR6V82226940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe9e1dfc67e8b595171ca7f677beae5b8d72698d8fbc20f30a92b2c9133ecfe. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/FR6V82226941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2460c389b3ae5c0aa9339ded69b627a3a40a31a298892264a905e72a604c7b03. 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/FR0Z50039020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe097a7ad5a6893ea43656dbd3e024e06e6fca48ebb0d55687c7785494269fff9. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/FR0Z50039226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14a9949fe0f3b35d97b665cbe81e88dc02acb55346f164badbd94c72b7535264. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/FR0Z50039394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417510536d4149d9c48681914f1830a6f5c8fba906233ea0685c9c9b658c143f. 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/FR0Z50053440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x235d9e8a30cfb54344ea5a8d07c6bf03e5a8546e41bb2a0a0f00e5480567ebe1. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/FR0Z50054332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfa0985fbe1abf0caab0a74c50abe137ad8d4abe46fef4f741b146393aa05dc8. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/FR0Z50054688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc97d2aa5fedfd132fdee1c5c30ecf2d3c2dbf941819515af68d186edd8a3688. 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/FR0Z50070827.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32841426dedc3cda99d9cc27fe8cfd4a09ab49c6e75d208d796f870d82874b36. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/FR0Z50072371.