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 0xc7c57fbc68150b99e98e5330fb22c18f91ec4bb2bdceea0e343a668fe34fdd6a. 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/1cd139c3-cb6b-4068-a8f4-4fddf8009709.json and https://artists.proofprofile.net/proofs/artist/1cd139c3-cb6b-4068-a8f4-4fddf8009709.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 0x6a509d3e1bee2ce8da2ebc9cd6f6637f0ecb467be7e9425acb131e33d4e68b2b. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/SE6XX2279582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3bd11072755b08e8114d72364a3f655b41a2173dbed0060bd1c1beb9b982688. 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/SE6I32355737.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x268104793f6ef28e32b28c4c573a5be919a5794dbcbd1428800e1edef3672fdd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE6I32355732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x932a22c189a581ea1d9a4ef99b2aa5c0632a1be450ec37cf56434f2e6537400a. 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/QZDQH2391576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f04907ae9720c247e1730f02ce91d208d8c5e55fe62ec8b0dfa4929e71840c7. Chain 2 (Bitcoin): anchored in block 958635 (2026-07-19T00:58:42Z), 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/GXBAV2487398.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40da52478b2c573a21acaf006442e24044deef246ea57eced1c1f08126246a5a. 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/BK4DA2415731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b53531951888bfc0e9af7a9531eb42856cd22433f5a90cbc6faa06ee7cc4996. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/BK4DA2426159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08367ad6a400d9fc7f8c26e7b07d06e81d50a5980cbf2f2a4020c285391670b. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/SE6QE2391917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cfa58e6b78fa1c3300619d4458c8bc683f56a7690fab31b50a41107dbc16068. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/SE6SA2472347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18a6e34f2185e4775bf5b8183f85f8c3fd7b1505b4117ddb2902a672f99ccba. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/SE6SA2472349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x593ec01ca6fec9d1e39ccc7491e6015493c7eadd0158ba3ad25e2b39a400d864. 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/SE6SA2472350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90d90489826d634c4c84b5ef310279d3dcc612c6fa2edcbcf62b59269e3a1975. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/SE6SA2472351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12cf736f213d7fc8d9fda4256d11a008d1fe114e3ef8373381cda6073dd310bb. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/SE6SA2472352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d7d4bd640e34a40e30eb725196a7f7e7eceaa2079bd90d626057125621852f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZQAY2395405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b032844ab3f2c532130ccc0405bc3835c776beea419a2e92869954eac1b24df. 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/QM3DF2271175.