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 0xb2aba8cde8df1b3c7f31e314f6a61fe89b81c9bcff5643c9247fc83527c043c7. 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/34f76a0b-a2c2-4a8c-8c60-7531feabecb7.json and https://artists.proofprofile.net/proofs/artist/34f76a0b-a2c2-4a8c-8c60-7531feabecb7.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 0x3eeb8565acd1455925823660b2e1ca60f107672bdca37b0b5256c8bd881f1973. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:41:02Z), 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/ES71G1613547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ade65cc9749c076715dfff81f6d9f3b8b8e69ce1b69857251a775ac151fa5b4. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ES71G1613548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90c5193514b99bb1963231b153daf3b9ea1a3bd11982982a6e3b305a795b5a75. 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/ES71G1613550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb156b4363bc1cf4e67cd47ce5e5c1f439d1b5fcd4b6b4ef65941ec07e52456f2. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T18:53:55Z), 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/ES71G1613551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66e067a55068eee6b90d23ef32c91a940533388893e29e8dbc34ec7070950890. 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/ES71G1309386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be6cf25d0763a273a69df51b57980d87cb5b1d636e91ed3ce3a42d5c61f8090. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ES71G1309387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf8d1b60eccbeab8495765a9a17274c14e8c84ccccd30023d0fe8f3da8a383d0. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:21:55Z), 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/ES71G1309389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe80b8ede2f25e6cab2a1904b2ef90136419ffa5b665ab4d4f094d6f742cc8d5f. 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/ES71G1309391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62b3c762e491913d6a5584d43c8468d68df9db4f257bbef5b02c4583dbb8a2f. 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/ES71G1309398.