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 0x26709356c38409eabd19a0265b028118cf26f9d838a20d22fe89fbe663cc7b0e. 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/f9eb7704-302f-441b-8ef0-2fd2886db326.json and https://artists.proofprofile.net/proofs/artist/f9eb7704-302f-441b-8ef0-2fd2886db326.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 0x04cd38a9b1aee84e9fe3c465c375565de62a4c175ea27665c4a6d487cae0a951. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/DEAS82000371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16758ee6f18d99015dbc5fa276935e10efa0c252c9b6ea76ce8d04a5219cc3ca. 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/DEAS82000403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad5547739d3b2eb846528fcf2c04571e7adf76997078fba4fb746effda85a4. 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/DEAS82000486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13081118c3ec7cf565409f87ae4335d61d12f99d498ca72f283f02a7ce493a17. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/DEAS82000528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a309c3523000a080667a21e4c815dbab4bf457ae069f8f3e986fb9e90341427. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:31:04Z), 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/DEAS82000600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee51f857960c45100f42235b45ce72e40d07495564aae3e7076f4280effa3b1a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T15:28:24Z), 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/DEAS82000619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6d12ebc86e6bae1acf3b266f23970d1d5cab4e416b7a67de3890f2e2f7438f. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/DEAS82000620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f12e1a3fec8115894f58a11b833772e5ca74673eeeac79c60151446656cd5dc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAS82000175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ad5547739d3b2eb846528fcf2c04571e7adf76997078fba4fb746effda85a4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/DEAS82000486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41b7eafe637959501152900460ccb050d69f29656cc83a6e3c09a2e73da1dd42. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAS82000302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6e8d95aa44ce72ad03457a7329d9e6caecec018f582e1f3d8558a979777110. Chain 2 (Bitcoin): anchored in block 959138 (2026-07-22T14:10:55Z), 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/DEAS82000073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7efbc40364dd0a0d7aed2d3f939166309291728696ebea7abbd5193595ca57f. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DEAS82000074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9522dfa12d643c54e1d6e6ce0f4db665e16762a9b040713d19891df70a2f5ff2. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/DEAS82000075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff38e6df9221372f40a8c8ad3af766b1f514c2da72a650b1ef9a4a80d8d6296d. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEAS82000076.