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 0x4b8867fd0d4b0b664f8a34ae7de73ddb38bd27e12381edcdefb29cb9104fc65f. 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/73c3cba7-66ed-4bbe-a829-c9c9ffee70a8.json and https://artists.proofprofile.net/proofs/artist/73c3cba7-66ed-4bbe-a829-c9c9ffee70a8.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 0x9b88bcdd7b82bc6d78a8f7597dfd6025ab2f68f0bfb483670ef76945f663d332. 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/DELK52112032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2fb60da3de1ba8d999bbef2a842a1ec5b829670542366639b81574fca9a7b23. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZAKB2169831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x902c4e6568bf011d0f8db8d0c3735de57f01003b81617eb3389ca16cf4447ee8. Chain 2 (Bitcoin): anchored in block 958714 (2026-07-19T09:51:44Z), 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/QZAKB2325695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc627c7088ec334769a076aa56918d07868b0ae16400bcaeef9b60ea3312eb57. 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/QZAKB2329476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede60ad4d82baa77ba498584d6d72103abdaa31dc17cb900df511bff9da0e47f. Chain 2 (Bitcoin): anchored in block 958561 (2026-07-18T14:22:01Z), 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/QZAKB2334376.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9d05971e405eff236a88d4eecc3e0e87440690119e91d269808539f6664a3ab. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZAKB2340831.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x312079e2cd642296d75029828054898db239fd6a5ffd09dad66d2d5abcc0e233. 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/QZVEM2364711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f71f04470b14d1726b45410f27ba5cbf11ea231d42bc680487652bffd4b1c61. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/QZVEM2390748.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ac84876471fa73847f9563e36b127758349b8c10a9dc287d5b49ec95cf869d. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZPEW2400609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c600895de0449d11d6800a59d973e4d82e892e6ed05ebbfc406837d4f3fbd9. 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/TLVEM2404420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a8b19b4e634e404752b4879d3be1017fc89532bf4ef6f201256c5b83446c7a. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/TLVEM2464870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x769447dd328ded72f2da2e8a972a36f342203e9137d56d22af25a172f915707d. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QT2VB2408874.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66788eebe3393c4489685d16b69698f5d51ca4892bea6a7f1003447fdf65c7a3. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZPEW2517172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd49bce48699c40cc610435139f5df0c02ad6cddb1060edb522ee8f5ef7b2a581. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QT4K42532895.