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 0x61801df6d3be38ce2c61eac4dd6e5c46676e3b4a64880560e47d8877fa3f6d85. Chain 2 (Bitcoin): anchored in block 953695 (2026-06-14T21:42:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6fef21ea-7aa0-4640-acbd-eac26f8a4f01.json and https://artists.proofprofile.net/proofs/artist/6fef21ea-7aa0-4640-acbd-eac26f8a4f01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Il pianto di Maria: No. 6. Aria, "Sventurati miei sospiri" (Soprano)
Dixit Dominus, HWV 232: No. 1, Chorus, "Dixit Dominus, Domino meo" (Chorus, Soprano 1, Soprano 2, Alto, Tenor)
Handel: Dixit Dominus - Ferrandini: Il pianto di Maria
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 0xb734e0b34d10619d5223e7ebbceb73dc17f5abd495806d8bce034fe9f62b5123. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022313001.
Dixit Dominus, HWV 232: No. 6, Chorus, "Dominus a dextris tuis" (Chorus, Soprano 1, Soprano 2, Alto, Tenor, Bass)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b0f0dcf5c2bfcc69e0d282395c4e02e7b8db7ea1fbaae8a5fa2e5cdddb9ae7d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEE022313006.
Il pianto di Maria: No. 2, Cavatina, "Se d’un Dio fui fatta Madre" (Soprano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32ceb423af930fd6d191faca08b4bbf5a39fe9ba7e7f7873b53af5e485cb1c7c. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/BEE022313011.