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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x418521a5c411ef76ff88a681d9a5f63874d388932e4f0fe2b691436d554fc538. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/334320d1-6334-497e-9b59-ba6b602b1382.json and https://artists.proofprofile.net/proofs/artist/334320d1-6334-497e-9b59-ba6b602b1382.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Torelli: Violin Concertos, Op. 8 Nos. 2, 3, 6, 9 & 12
12 Concertos, Op. 3 - "L'estro armonico" / Concerto No. 4 in E minor for 4 Violins, RV 550: 4. Allegro
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec71f3ffd3ab086084191f735a7ca5d2eebaab1ea0a58c46e5a12ae6d04790a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLA508309714.
Concerto grosso in G Minor, Op. 6 No. 8 "Fatto per la Notte di Natale": I. Vivace - Grave
Corelli, Manfredini, Torelli & Locatelli: Christmas Concertos
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98345f7ece90a75797142b8cbaed577bc27ba1202f35e075c6bd7a85e5087621. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/ITX921003099.
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
Concerto grosso in G Minor, Op. 6 No. 8 "Fatto per la Notte di Natale": II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f899b5c4d27943ea2cc55d01f54901a1f65d06f55fe75357a7b734b80aa4412. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ITX921003100.
Concerto grosso in G Minor, Op. 6 No. 8 "Fatto per la Notte di Natale": III. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe362e6ba4e9693231960e61c0900393e6b2f6456372c41f56972ca9b938faa66. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/ITX921003101.