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 0xdf16bf7863773523ded28267e2f8d4065d3fd6fc106658f2365dbb76b0f18f4f. 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/b1d2dae4-96ef-4c12-9ec1-fc036551bb01.json and https://artists.proofprofile.net/proofs/artist/b1d2dae4-96ef-4c12-9ec1-fc036551bb01.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 0x7e534306ce83c80880bc2b7c95d8ffc07abd6904d4b8b010c345eb24662b5e67. 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/QZTB22202341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdea1e849642046cc00efb0874e76385e0dd90e8de4b51899ef24aa1174168145. 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/QZES82314255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56df70214334f53a96f188be4a357f069f8fb5edec80d31c8d7d268b8ccc5791. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6G2310757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c933c8d94a34c2f170780e2503fa56142f6c9d42d54d7c90b605d9407d55dbc. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), 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/QZPLS2308901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefffd7d405a3e3f2e1e51e55f5c86a41dfdd8c1c337d172e7d74d7bf4468475d. 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/QZTBB2355793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f15002eaf9d895bd29927f8b74176479442bf191ae7e1f4bde449755f0562ba. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZWFQ2366870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddd90e0ccf7fc15577e6a079ee25215abc866b72d4ea459fcd49011cf9e02bd. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T03:49:04Z), 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/QZRP52491862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7651a1d5c26c450d6e6c4c60230a97bfe6c955e2eeb837febb50bd08fcb1ba. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T10:41:34Z), 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/QZTB42480553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d970810e10ff3cd67f6fe20ed63ed84437679022cb8c03ff5ac3057fbfb9ecf. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZWFF2492355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x324222872a361a76d2e7c4780f0e4d30264b06706853d3fae476b3097b1c6c26. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFF2492356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3cb5fa1768fbaf92e99fd8ffbde62cf2b7b2201b98b3f5e6f3ab669333ac76e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFF2492357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7078c16955db2796aeea0139ea9db649c70276ff727b0927fc4a5d853a1ef994. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFF2492358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d584b59457a0817bed13bf94eca610cda0e4d2aa9a613a3d5f733ff59616911. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZWFF2492360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8be609a5f3c9dc8a50c3d0822070192c4c16f3c63e505d3dc35082565ad33c4. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZWFF2492361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4afebd4140f1894c1c129b06be51cc4c436293253e107c71e12a1aed0ea80d7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZWFF2492362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd824081113a3c45c6b43b1092fcce974f70ec923c08c19c1512a3f97e65a3494. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZWFF2492363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901c235181af30650bccedc57c61a57b1cd840d4779393dc0c70d1ec970ada73. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QM4TX2459158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1587d372f0c5c6de4be14eb71f0938cc8ec2a02356e5eecad2c88b278df74842. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/TCAJA2444022.