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 0xf8fcda735922e55e241b86a0fa2ba591608981a3c7c05545f295e144df4b5798. 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/3a3efc75-72dd-42e0-a7f6-423640ac6780.json and https://artists.proofprofile.net/proofs/artist/3a3efc75-72dd-42e0-a7f6-423640ac6780.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 0xce43a48f0a8b7fc2cb52a2d0a761ed4cdfd9bae031b66997745b721c686c47fe. 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/GRSTY2100719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf00ae708f90fd59e3e3a33a25fd66b36b725d8b7ba916d2c89837b5bb5b2d0a2. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/GRSTY2100720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15702509061d1ec3625ce81b1844e56b506d78c03836a4e4ed5e6f8dc9ef9ecc. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/GRSTY2100721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7647ba590caf9dd65bbf0d762f768b1b8d668cfc5751f91950bd1b2c376b015. 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/GRSTY2100723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c23759bf2714d8b50aaa7b064f4dd611d3f406bebd99a2244897aa36b7a220c. 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/GRSTY2100724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c887291cff4bbecceafe1f1ef3ba9b427b52274b08e2bf7d87606ec133593a2. Chain 2 (Bitcoin): anchored in block 957741 (2026-07-12T18:30:59Z), 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/GRSTY2100727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48f5643806dc4fa6a3ea4a3b7294ceb069908ad0169e77216b50d436ff9c6ca. 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/GRSTY2100729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6847df3895b7c8c2fc1075923dcb2f0d2093326e8d499f53aeda2d53e3888f38. 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/GRSTY2100730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b3c23768dfabde12f9e7d2593c77149f3316747efb6a7c544eed9fd2cc6e310. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/GRSTY2100731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fa80725efd63ae673b1947897892d105f5b77aa660f444cea2cad115d456311. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/GRSTY2100733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fdf62837d376972c4f65cb7c2c8fe924f0fda6640c3af7e9b3209a13894080b. 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/GRSTY2100734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12ba0d47de2ada73815cea5df7781f6d7b76c0c6d614e04bc22f296460feb554. 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/GRSTY2100736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41a8863bbf3f63c2a01830b2c2470515e034407cf27d9d9bc02d05ad40aad92b. 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/GRSTY2100742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97809bbbcf1020ed8fd777450856d5b504f24b76a0f4df2d53d5a5d54e1ee383. 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/GRSTY2100744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x904494c6867f579a0f76d21f77c47197b4c392ab59da723a87cba1fcf250fa2d. 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/GRSTY2100747.