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 0x6a88f256ec5e8baabcd4b793e69ba5de250c566639d601d5274f5ed39d7bb0ed. 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/1834fa1e-9abf-4160-91b4-3a86fa57fe9b.json and https://artists.proofprofile.net/proofs/artist/1834fa1e-9abf-4160-91b4-3a86fa57fe9b.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 0x03bcad96edd04d20ad31b53426b381ea888d2ed0ac9df3ccebd85e83e10d52e0. 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/ITO900600062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6e6b00b8ac190d4f0ae7da543541fb2751144422d45031b69bd7bafc69763a. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/FR6V80935328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc4015b51e2654c2b590462ee3650086695ef6d01bc41be0d81fa7a032561167. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/FR6V80935329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc460a45ee83ff56bfa527343ec981f18deaa0c03ace65b6a61dd07beb190d58. 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/FR6V80935330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x728bfff27c3858b51e1ca3ff816e1e502e1065b84406d8cf4c0a64197d356a13. 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/FR6V80935331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3a4de7a1403e65970330d5c9899f73661d49eac591272319a37c2ad5074244c. Chain 2 (Bitcoin): anchored in block 957647 (2026-07-12T03:57:41Z), 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/FR6V80935332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb25a5b8b7c9ab6133ea79400470aa2fa9f4a0f1fd5b0f0100f2324fdaeeca2. Chain 2 (Bitcoin): anchored in block 958695 (2026-07-19T07:37:00Z), 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/FR6V80935338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b076e50e132845fdc2893c80431de95806888ffcd2d969d4ecf97d81f68588. 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/ITP981300023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc1260a433c1c1829c51a09796ed2a1cb599a3dee8684f7777e75a72f8ea261b. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/ITP981400066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b7aaa34154ea8a9e2149de3ebb0d24648e370f363b8293686dd2368aeb46e5d. 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/ITP981400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96ab3d08cd780078c2aa2a6f0d5a42e284b9ba611efba04deabbd3741cd4255c. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/ITP981400073.