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 0x87b8506e53934d835d930e5bc0a3b86f77a32921091fb814f3ce8629f828ee23. 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/93d463ab-f07c-4b28-80c2-a48e5850bfc0.json and https://artists.proofprofile.net/proofs/artist/93d463ab-f07c-4b28-80c2-a48e5850bfc0.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 0xa22d50db3ae8586549a7ad7592678ef3d6de746137639301391a173408ec8ca0. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/BC4G12100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bcc298eaa9387be903da3e2011843b35eff105e710f1aad99a57b0b8c9794f5. Chain 2 (Bitcoin): anchored in block 958627 (2026-07-18T23:33:54Z), 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/BC4G12200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9dab35db62477c4a390297c0ea9eabe1df844f1792e687a1934ac4329a40f8c. 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/BC4G12200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90158de7e791b1aef3b073dcef6b35084ae6d89e09690ce7b4c0fd51941a4d6. 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/BRRGE2300645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a96513150abbc6c1c110b52d8dade4979137fc76bf7d0a0d3d171aac8df47e. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/BRRGE2400411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735515c2468c0239d9b7d34f5d97a5cf2b82a2efbef5420af310ff22f561425b. 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/BRRGE2400532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84040ff87fc358457e5be2d0e6f0ac13df10a4a2bf2ecdeb6341d9afc03a458. 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/BRRGE2400530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735515c2468c0239d9b7d34f5d97a5cf2b82a2efbef5420af310ff22f561425b. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BRRGE2400532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21a96513150abbc6c1c110b52d8dade4979137fc76bf7d0a0d3d171aac8df47e. 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/BRRGE2400411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ab35c948112c612b3ec672f8503fc678a174d944fa61c1f7d49282e97cc73c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BRRGE2400536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65b7c71a7928b12a9dc4b22d6b51e520d9f64dab451efdbe9db349684f78a65e. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:02:42Z), 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/BRRGE2400540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbbfa5adf2f2f2e261ea5650d71ea177cc1fe94a8c85190fb42778f95fcdbb6a. 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/BRRGE2401299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x125228a42eb095f49cbcc6ba0d1e2135d4398179017f483c9f2ecb4e6fce36ea. 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/BC85B2100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb90158de7e791b1aef3b073dcef6b35084ae6d89e09690ce7b4c0fd51941a4d6. 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/BRRGE2300645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13f4334f796070b14f2cef7c54919a09e53b81390a37ec10e21414c0cb2d44e8. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BC8MK2500001.