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 0x38117c7affb256e0adbd809ef3d0f1fdabfd3367dfcc90604e47582b08c97822. 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/4f5f0833-21d5-4407-aeac-2320226336e0.json and https://artists.proofprofile.net/proofs/artist/4f5f0833-21d5-4407-aeac-2320226336e0.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 0xffb39d6576c80a62fecd67485c966a8fde75e6d694b6dcdb3d7aec30d71f5617. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZMEN2437727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d62afacab35baa7c2d99c83ffad6a8200ada5652c50931fd8ebf2043062591. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZMEN2437728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97f3c4e954a5346dad717bd49fcef547adf039db7afbc6681622ed5f0adfd549. 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/QZK6J2473092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69028d96d8499987630cdc7ae8836acac8e470339b9ef7486b07d0f6bf761793. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZMEN2437729.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed4f1b8f45ec2d669e0e3fd0a11c5ed4e15e8b34adb5d446eb754c37c940204f. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZMEN2437732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ce498cb561bec15ad95fa99b1cc4b2831fabf6c3e2a42f6da97e2f3550edb91. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZFZ72567459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7daf7e89bd491c5ac2178d8a7b207ac99fc46af0609e98ccd1cd2c5b1206c55d. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZFZ72567460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0087394e43fb2a3a13a67acf4b822b53f193ff2e3afbefe74da58710909bf1a. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZES52599141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0087394e43fb2a3a13a67acf4b822b53f193ff2e3afbefe74da58710909bf1a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZES52599141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5bb42a1480c0ca1341c751be8be32fe940c3aff7c56eca2be74078f25c62c35. 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/QZHN52507897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dcf2d67ab36cd926cb3ce1d3548ee6e54d352fbe3acdff7604a0b0e2bc0519e. 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/QZDA72538332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9decf8f1386b21729e1a8987165d8cfb3724ad78fcf8f766f107cb5d5ef97f05. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/QZK6J2587117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe0f4ded31e134d6080531141bc3d21ed372cd7d1f74793790cf6f3ed1919c045. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZNWV2537915.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403c592c80b4a200579907cf87afe913dc9d22763517edd28a0c537bf1e61a0e. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/QZWFX2544000.