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 0x13138dddfda88f2810894f6aa9b1fb96a8b93e28b22d1b762a3fb9723c9a9eac. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6121c5d3-eb4a-41b3-8e26-e159f3e40405.json and https://artists.proofprofile.net/proofs/artist/6121c5d3-eb4a-41b3-8e26-e159f3e40405.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x0ab2b4d2426574db0bfbe51e54b5e9a689c6b6e1b35e922c710b1413a91ff256. 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/JPZ921314811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc8ae91eabfc17de5e8cde880a818f6b8503b98d6973401b367232bbbc59d7a3. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/JPZ921314819.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96e1080a4bc1dcf2a6941c8b2f7ee0109fafd525fd485dffc3cd917ff55e7ba. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/JPZ921410286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44491fb50c7a2693a4daabf2f06255cf3248276da1c616c09ecc94eb9e21519e. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/JPZ921410287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bb10c88e43c260c8d149a18d3e06fb74512af86acc6037c58d842ad87c0329e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPZ921410288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d5d3f73ff737a2b377cf5372198218b4d42996112c1196c28ed4f47f6bfe139. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/JPZ921410290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x685241a0842f796b59d09c98b7050d9e7a6a3c8f698a418f2dca3b85b2830570. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPZ921410296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f36838b05657262c8059692390095dd2470ca6137377a32951290beb6d6ac5f. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/JPZ921410303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bc7a764c4bc6d84ba89e6654e6add5269d38e42c403a6dd7f0f529ddfbdae6. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/JPZ921410304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15eb84bfb23ddb5c7de33bbefbea9ef43cda6939d4b495ebac2d8aa935cdad3e. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPZ921410309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc5726cdea647bdcd9a7baadfdf2ae130744b49771c55db292f2bcb989e0fc6f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/JPZ921410311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc507619063773356c7c3f7f8c93c953911f36277bc69fb906a7d3f809a075c0. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/JPZ921410314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4791ec2ddd870d9cfa2ab1433eac0abf121521f8ba8e00f24270a312e869fe63. Chain 2 (Bitcoin): anchored in block 960298 (2026-07-30T19:26:00Z), 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/JPZ921410315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71b9315f4e57c6ad6753c5338630ec5981f4c7e2ead967675109998892d9ed8b. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/JPZ921410317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb26f4f6b749fdef2003e9e5e246d2563e6a042416adec396dc996f0bfc8806d0. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/JPZ921410316.