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 0x22d052b6fb3ccc9ca05e0a5077447173f956d9a55d9603abc62af4c4afac2515. 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/2ad090e2-dc6d-46a7-b8aa-0f900e209d1a.json and https://artists.proofprofile.net/proofs/artist/2ad090e2-dc6d-46a7-b8aa-0f900e209d1a.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 0xcf7aa2e1ab20ec928beb1d324d29c5a6b51949fa9b557830bd1be193199d4d19. Chain 2 (Bitcoin): anchored in block 958121 (2026-07-15T08:02:12Z), 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/QZFYZ2430190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef212c9bc7d6c0340c891235ee56bf95f4fb0c95aa07854872615166d4a17a0. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/QZDA62444064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1a103df2cd15914a38d5ca2584325480721dcfa4d4e9d1e8a2374296711b51. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/QZNWQ2458402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b0dd3ca1a5fb6663b3d2d139d27685e7758ee3b66167f8d62fd5b0cad093cdf. 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/QM7282466204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87b5d7bb254beb481924cb5f2c4d11e55839b7878fa68df0729fbd72646bb770. Chain 2 (Bitcoin): anchored in block 957801 (2026-07-13T04:17:08Z), 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/QZS7J2465021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2342745fe7b6b8fcf1c88d95c70fe0c2870d1816050906e42465d7339f405520. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZS7J2413384.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde01d5662b97e400c85dbbd723728834b747ca5cecbc7c8e62f606048f40b184. 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/QZS7J2449121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32052aaa87ab892cdca49b4a94b34e83cf47d175f3a83dafb7f7c9db6cc74933. 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/QZS7J2431374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1642731c2396604a4fd24f27714185c8be84a0ee8548f5b55d9621a9b0a5bc5. 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/QZHNA2419875.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297acb4c56b052f4e1f0919239e0e7887f9f0d00973510bfd92421da8f298802. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZS7J2430711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8023979a1d6ad0eb4f5dad76736fb6cc7f0d0029c254069aac95f41f39196948. Chain 2 (Bitcoin): anchored in block 958673 (2026-07-19T05:38:28Z), 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/QZS7J2425570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16e559ce931b0f9ed99c98e3bf2df3a6036bb128c1c672a40fb396c06ffc8025. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/QZS7J2493244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b3c91ced4184d3fe62f5deac5ac495237da9c35008543c1ff48292a368e1a39. 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/QZTLA2416131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1033d7221aa05de8e9066470cefee4b690fd173a8d1af6ca87a0e57f2ee853b. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZS7J2495869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1617aefa4497dc8f0388b188d0888098759a88590137daec6e4de014130499. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZQAY2543231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd84950474d25c2798e5e8e8474414ae8bdd4be96f55a52aa6109a9a53bce8dda. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAZ2264352.