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 0x8eeac20a82fca239e4f00246c80849a3c0015b90705538f827030aa303e60d53. 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/6bd90a1f-006d-489c-aae8-58ad17b8cc0f.json and https://artists.proofprofile.net/proofs/artist/6bd90a1f-006d-489c-aae8-58ad17b8cc0f.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 0x33eb3aa30658a77bf6142cda2c42d6960cae95659b838b4d34cf693af49e720b. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZA163367345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f2e0840c6811a698a0bbb898e4d3c96d8ca28dba230f9fc09607a75b8af467b. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/CZA163367351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03645d81fa0017e86cc44eb36d18668845ec22b7640ed57fdf02c5326d27a37. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CZA163365137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x711221fc30bd58ba66f63fe3380c75069806bde0cf2f8c95973eda21fa8dd08f. 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/CZA163365139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x947e08728ff4832ea69d8aaca06ea02fc0d7f625e09a693b23e9e6078b5dc5f6. Chain 2 (Bitcoin): anchored in block 957737 (2026-07-12T18:02:09Z), 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/CZA163365147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c00d0c9c8f0a91d0e1f96448ca786778f87647e3e62f717a7dbce99445f841f. 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/CZA163375332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7474ed44d3f0f9261218cefb47eb5379249ae563554f29edf927a0a8ba19ce4d. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/CZA163375334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1205c2632dfe8b32f9a2f8351f98d4a764beb096942d031b918a7057e422e65d. 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/CZA163364947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a0544933d31d909085069283931ad31751f8f2e96498192f432e344d6f88d14. Chain 2 (Bitcoin): anchored in block 958943 (2026-07-21T00:27:37Z), 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/CZA163364948.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf10ebd5ca7b46375c9c8fcbb2c16e80af0696efe63b7f388ace70a403c02fc0e. Chain 2 (Bitcoin): anchored in block 958686 (2026-07-19T06:43:29Z), 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/CZA163375344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75dccd96d5012523651c821df84a92aa0c43eaf19ab378744811313e3e9f5630. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZA163375353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f004a3bbd2154fab1378bf1dacbdee187d7d47229377b425e43c8b4af04dafe. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CZA163371640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0898b2fd087a57f6a36906e4a6e4652167e77718b9c2d76a4c752d51da877286. 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/CZA163371641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d38c145b9a55dab1f8353c2559c70678ab2d9c80ec7afd6025f274a53b93612. 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/CZA163371644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2845631408bfac27a5e62c3697f11ec69bb6a4183ed7097809a7d5d566489af. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/CZA163371646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8008a490cac83998024f381d209020e2d25f96cac776d36274b1f59718032c9d. Chain 2 (Bitcoin): anchored in block 956402 (2026-07-02T22:05:07Z), 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/CZA162253017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661f30fdb3273aa9f849afb85a4caebe4b310ea80c0bdceb0dea71a6c9d3ef9a. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/CZA163365152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72f1fc98536331cc884abeb212abb0abe30758e3b7fe0eae7cdfae03ca040623. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), 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/CZA162350015.