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 0xfd44879ca83b559aedf343e1f5c75294ceb236742f2b8c73a145fc6667b82ae0. 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/5804ea03-af27-4e7c-aabc-a0230b60afd4.json and https://artists.proofprofile.net/proofs/artist/5804ea03-af27-4e7c-aabc-a0230b60afd4.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 0x892a875cb554f768b67955dbec36a718962f32e67419fb750679a40fb58a991f. 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/USCGH1598462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f41b6e183c0fe8ac079e449896c7e6aade05944bfb31994d24308ea33b539f. 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/USCGH1598465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf308f41cc1c6347b81669b029d8ed99db1a9098a19e6e04ff40f09699b5d4536. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/USCGH1598466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc85aaefa3028d9c5c763d72420c576af4cb2599df80609ee8cd08669dc1df12d. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/USCGH1598467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59abc0c2a6c82d57ad7f65bfdf141663ffa5f2cefa47592c44153b2d8684dce3. 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/USCGH1598468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e53c436931ebcede090d8db23f3fde665540daf590f6c174989f269bf7befa. 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/USCGH1598470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f2edaba21ba5888b344ef5dcdad1bbb1ecea3d23081a97f015c0df8d585dbb2. 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/USCGH1598471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x137bcee8abc413a050d4de356fa2e78c52212eacdaec08bd004efe9f19f430c7. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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/USCGH1598472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79545c349d83a425325a1fca7cf4e3eb444a9c19e7ce78a236517f22ba5005cd. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/USCGH1598473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28d0834280095d809b99bfc1cedef5adcd8e9aba4179e1a888b44b64ff13d02a. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/USCGH1598474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe94e9f9ff417c4ad1a6a243f8b742ce91ffa13129b25dccad5f6511c3b1afbf3. 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/USCGH1598475.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed636809ef97c527a4738664d6f960e6c1ef5adda1caf8f4c2391a00a1d71ed3. Chain 2 (Bitcoin): anchored in block 958324 (2026-07-16T21:05:52Z), 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/USCGH1598476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bf7cfc143e7cc2fb937b68f133b0cf27d9f419354561b790d293cc16419d361. Chain 2 (Bitcoin): anchored in block 958325 (2026-07-16T21:10:13Z), 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/USCGH1598477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b30feaf48099150dc0b76dab2c9c1910b506a3cc0481ac9b43b19fd66a309cb. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/USCGH1598478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3176109494da2627ddca6cab8a8649c757a891c2266aa707600106d11415b26d. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/USHM92115766.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd77ac27f3ee994cdbe8eead677905e1bcc2034463b9f8a17205ab5acf78a708a. 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/USHM92115767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88977a8b28549b187c9ac6e7cf3df663655d15445044e961b9b726e0eb4f1f6f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/USHM92115768.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32cf426ac09664248c7566c4323646c7e9f61a3ea3f2fd14cbeafc6286774234. Chain 2 (Bitcoin): anchored in block 958878 (2026-07-20T12:32:15Z), 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/USHM92115770.