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 0x8f78a6cfefee31fce37c8bfb5f0e846d0cd1a807b107cc2bdb6e3fcb4e81a53e. Chain 2 (Bitcoin): anchored in block 953780 (2026-06-15T12:02:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d498964b-6471-4a31-a2ec-24d2eb82c169.json and https://artists.proofprofile.net/proofs/artist/d498964b-6471-4a31-a2ec-24d2eb82c169.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 0x9dc7fc1c69baf9437e10d65cd5b27c5f3a622df61c200e598ee2428216d054de. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/TCJPX2368586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1aab0373a33631a917e07abb70d897fae073d5a49b68283f05a51601f7ed0aa. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/TCJPX2368638.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9e920882b60df17a1bf8075b00a9e48ab0f278aea269c73e22f461c45277615. 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/TCJPX2382944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0b04e05b5fe25620c1e811867a34150bcb48a019b28e7c158c28ac25dceba2a. 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/TCJPX2382949.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56a198592358305a4559f2a0f3edd4628cecce14f782e3e225688533039e0bc1. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/TCJPX2382947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea85e50faa4d49eb46d31b08cfe2ec53591fcafd03e8cc3b2f7136e37c41fbc. 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/TCJPY2477283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x576910bfd882d523bfc6157cff0b6b8bb5385c387fb093e34919bc6613fdf70e. 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/TCJPZ2468883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcae0167c95692f73dfa9dd5cf296a2af25cca7b135a9451b1c0ca260271b016e. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/TCJPZ2468892.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb732a75c4bda08adde3d406fde3dcd71ddbf6e9e4e0f28499b6ebb43e33f535b. Chain 2 (Bitcoin): anchored in block 958774 (2026-07-19T20:03:27Z), 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/TCJPD2421849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fe854f7b66062e3345f5f9b15173b1236573f35aecf2386467ec721fe985a56. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/TCJPE2533573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f8fab4d87c667b590c60bf144fcdc76a56ee6323389c0ec1d0787bad2202e0d. Chain 2 (Bitcoin): anchored in block 958465 (2026-07-18T00:04:42Z), 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/TCJPE2533581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdf07dc5d1ff69bb34801d6024427de147ae879566e5587afa9c0f777753675c. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/TCJPE2533597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f635d039fe578921cc84de0d095e75e824b4aaa65741add0d414325f86e4556. Chain 2 (Bitcoin): anchored in block 958473 (2026-07-18T00:52:36Z), 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/TCJPH2509766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c925a9ac5b1eade05e16ff428bb7806aaf8f8deefd9e4624407d6b88f887fa. 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/TCJPH2517722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c925a9ac5b1eade05e16ff428bb7806aaf8f8deefd9e4624407d6b88f887fa. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/TCJPH2517722.