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 0x5e1c0cc2dbc61db777a7df78232d5227a91b62ccdbe81b8f5cbb260a72faf732. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f1a4c8b6-8fdb-48f8-9e50-90e3eac6cf8c.json and https://artists.proofprofile.net/proofs/artist/f1a4c8b6-8fdb-48f8-9e50-90e3eac6cf8c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Hulda, FWV 49, Act II: Scène. Ah ! Maudite soit la journée
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 0x9549ad3c88edc7a3330d269259803d8e2653635ab67c511333817a2a40ca4695. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2300507 — a six-check JSON result.
Hulda, FWV 49, Act II: Arioso et Scène. Mes enfants
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e3ea450eba5d5359dc36bd274af5f2501caf2a12f2e0fcec27d5582d519b83. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2300509 — a six-check JSON result.
Hulda, FWV 49, Act II: Finale - Chœur funèbre. Grands Dieux ! Ah ! Mon fils !
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec50083c9d0c539b08333e5e6b73f28c94ee250c42d0de83d4cbd4571209ec0. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2300515 — a six-check JSON result.
Hulda, FWV 49, Act IV: Scène. Tout me blesse !
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x364b69b54ab25e1be05bc93745b46c9a101d5fa15ff0e810f563a0b30bc033f7. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITJXZ2300530 — a six-check JSON result.