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 0x8eb51aabb4cb0007d0970ce1ef13c83310010f9949ab3a828fece1b15803c396. 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/2840832d-7e0a-4e75-9261-1bad5c700da7.json and https://artists.proofprofile.net/proofs/artist/2840832d-7e0a-4e75-9261-1bad5c700da7.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 0xef6c32fa1e52b67175083cd71e803cc67a8443a68737e925e046625fbfc84ffc. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/ES71G1630775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff823c213096b87beae8903f0c72a45a52ca05a11149f34a7643d15008df45ef. Chain 2 (Bitcoin): anchored in block 959063 (2026-07-21T21:45:32Z), 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/ES71G1630777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf6b08309f946e75b535b6112b983c4750a3e6318c459b46b6dc8bcaa45572a. Chain 2 (Bitcoin): anchored in block 958484 (2026-07-18T03:34:53Z), 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/ES71G1630534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5d63074f05e225ddf337a2f520dee41ac49a831100b5d8a034a202d0ce27de2. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/ES71G1630536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57dd492d86b488c9abb09fabda814b01c4e7de74675898df4095772f322b7d2c. 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/ES71G1630538.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c835e1570424fbed7ad69b95c06d08ffd78f890bce7607289d7c929617d506a. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/ES71G1630543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cae1f308faceb1c0f8862a6e08dff5e69d4525596caf90ebad7df5be2340721. 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/ES71G1633719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85a8c9763653e8f5556c12a9840d6678c8fefd2bdd121de2acd1e42e689bcecf. Chain 2 (Bitcoin): anchored in block 958987 (2026-07-21T09:04:56Z), 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/ES71G1633722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba46a1e16cacdfbba36fc65cae08129e4255af455ba0d419362a02a0b9cf1e79. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/ES71G1633723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0eefb24e25e580695036b9c9cd9caa6ab61abb9566bf54805b809bec819290. 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/ES71G1633728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc01290aa1e96be2c8119268c88bf8946bb5a81e5baecde51d39b2ad13aee8652. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/ES71G1729419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67312d5c3037e1024d6cf62179a0e76640fd9c1478c83ca7235f3f090ceb0863. 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/ES71G1729420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01c9ed2a2602f61979a375c70c53663c7d480dd6008bc9e1f733ef472b69abd7. 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/ES71G1729422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcced857d49ed5e840bfac6fc9df188f77aa62a736befa11cbd4eb89070df2816. Chain 2 (Bitcoin): anchored in block 958552 (2026-07-18T13:15:29Z), 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/ES71G1729423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fe77165480c3c2358a30a472d00efc5541a6397e6da6e79089c46be215892a. 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/ES71G1760144.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28f11a3fdae905ac04e16cb703cb485495508b147dda8ee2dabaaa66e91b3cf8. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QM7282343469.