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 0x6d0fdd91291c726574fc1bf2fccec2fe693801b051c83f2fe9783ef545b5d1b7. Chain 2 (Bitcoin): anchored in block 953636 (2026-06-14T13:03:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/373af76a-5d00-4c3d-8cd4-af599f28f6e2.json and https://artists.proofprofile.net/proofs/artist/373af76a-5d00-4c3d-8cd4-af599f28f6e2.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 0x7408cd395b874b41d7e9eef5db31447ca9985708f03e1506ca3db47cb3b9cea4. 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/TCABA1107053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x452738b9437fe4dbaf6654b0f36b09f1be1b97583fab64212e674da3970f80f4. 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/TCADY1825800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf323f183c56501f948a64aa1acb93eb210da702d335411a3fc2b9cf50e603dc. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCAFT2169981.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x017c63fdea9fd26d8dcad870caf94ca7f3c4cae3cacd5e9d8cad255ea0afdb71. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/TCAES2067345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc966c0374d5261bb91699b7d83f6c6ec406c5b47d4af52d84f69a577fab7c4. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/TCAFM2157888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fd6cf175c4a04d77fc6752be6dac45566d5d14aec76efaaab77bbb5365f439e. 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/TCAEM1934369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f7f311bf4933209e7883871f3696948456ea0cbfa31bb4e8339387cb6bc2a22. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/TCAEA1803692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a4d167335b4f26fd568caa18b5d9c137f083d9351708e1fe48a9ac036f39e48. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/TCAEH1949752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf322cd9f6d99da17b9cc496c32d4ea3ea67341f30c94f02f9bfe96ac4001446a. 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/TCAHN2379833.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004bec3a11c9ab218ee1b852297ce37201af3ce468f8152f67005d9088d52ad8. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAHR2353542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fdff12cfdc2063fb3edd5cd7e0a0ce666a72610c2e8ea83cdb6ca8e86f6e813. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/TCAHX2440382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec5dc8df497454c1fa378f0842f865a86d999c47267b83f8caeaed91ad5713d. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAIA2406869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x004bec3a11c9ab218ee1b852297ce37201af3ce468f8152f67005d9088d52ad8. 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/TCAHR2353542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb056d61692f72d0b2b2dce8a7f2ecaf3ae85d7df48dc794cfe63294e7b6c6567. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAIC2493540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb59a18de64448464f57c4e15383b166fc9b9c5c6f19dc85e8de9470fc27b3aa1. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/TCAIC2493563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda8b033712ec9b552ba7096108038b3b375a2b519ea4a0903b8f91d0075baf16. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/TCAIC2493574.