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 0x5f60c06a328111e27837db943ce8f482cd79404132a9baf9f6355e4e0e082f8b. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a0d5b63-6d5b-456a-9e94-f9cbf45dfacc.json and https://artists.proofprofile.net/proofs/artist/9a0d5b63-6d5b-456a-9e94-f9cbf45dfacc.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 0x751b87135a0505ef8b3e42b49f96ad8d8bf0d8b61e39547c1ba2464350fe00e7. 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/QZAKB2366141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2359cd3c6b3f86daec584d790d6bafa88c9da8f9e77caf6aa663b8df67915a0c. 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/QZAKB2366142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4ac21d39cf2af851fa0e3e28bd2d490437718e62e1dff9304ef37f4f9f35f5. 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/QZAKB2366143.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23bac47e18816836f709de6e44e8679399924b41b230556a243700527029863b. 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/QZAKB2366144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x667fd8d3d11aedde7b7e3b26eb7e3c4ebc3c902094c914e67fa4d36dd298d36c. 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/QZAKB2366145.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x025e0f242a6e1cba6e0c81082a472d00b3e41fc4cf97aad0d47dcff2647310fe. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), 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/QZAKB2366146.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7418d4059fa4ca7ef5211b3457df50b6cf4543c3f517126bdccde223b4f1b98. 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/QZAKB2366147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30eb757d796e792b184623856912ed65b0cf8418285966c8a9778e96a70f956f. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZAKB2366148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25eca8c579a8d3aa9acfd8d8491e314d6953e762b4f79a1b13675755a2fd45a1. Chain 2 (Bitcoin): anchored in block 958355 (2026-07-17T03:11:50Z), 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/QZAKB2366149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a61acc0a9e6d9dac658780cef3316a6a82d0a45ff8dd4118a4eb9799330af43. Chain 2 (Bitcoin): anchored in block 958410 (2026-07-17T12:18:07Z), 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/QZAKB2366150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x048a75bcae76cb1ff3ad8e3153201c6e9be61dbfdd2b1f2bf47007f2d4043012. Chain 2 (Bitcoin): anchored in block 958263 (2026-07-16T08:19:47Z), 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/QZAKB2366151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fdb7ad2cfd9ba20c42bccc94b7c21739672eb611a00a2873c8b2ebf9f9da34f. 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/QZAKB2366152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde521d70993c0a77ccf542943de15057681ebd6e11aafa32ba745f456a83f312. 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/QZAKB2366153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce93349a5af8d1dd07366b3ce398c3b81932884465a2ec266e9cd1560a11ee80. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZAKB2366154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37dd53dc441c16788bdbebb85704841a702fe159c66d9027ece7d6b6ae4d7803. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZAKB2366155.