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 0xd41eed0f53965524d12459c4edd700a61653fdc8bf82760d0705e43bba246280. Chain 2 (Bitcoin): anchored in block 953598 (2026-06-14T06:40:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0c438534-8aef-4b97-8bc0-281aa130b793.json and https://artists.proofprofile.net/proofs/artist/0c438534-8aef-4b97-8bc0-281aa130b793.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Tartini: 6 Sonate a tre e Il Trillo del Diavolo
Vivaldi: Concerti per oboe, archi e continuo, Vol. 3
Vivaldi: Concerti per fagotto, archi e continuo, Vol. 2
Vivaldi: Concerti per oboe, 2 oboi, archi e continuo
Margola: Musica per archi e Concerti per oboe
Boccherini: Concerti per Violoncello e Sinfonie
Bitti & Haym: Sonate per violino e basso
The 5 Violin Concertos & Sinfonia Concertante
Violin Concerto No. 5 in A Major, K. 219: I. 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 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 0x53e0880b81a1bea4ef8b0fe192cf70239788b92b9b4bd4f47534c83d6e25bfd7. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITBZ71400051 — a six-check JSON result.
Violin Concerto No. 5 in A Major, K. 219: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39069678f86bfb30722b3133de57eadf75ff1419ea25b3198cff354d6ce96edf. 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/ITBZ71400052 — a six-check JSON result.
Violin Concerto No. 3 in G Major, K. 216: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa608052244fe7044f8c944e289f8677b80d6518e432b6d91890c015c64716399. 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/ITBZ71400045 — a six-check JSON result.
Vivaldi: Concerti per fagotto, archi & continuo
Vivaldi: Le 4 Stagioni - Guarnieri: Stagioni
The Four Seasons, Violin Concerto in E Major, Op. 8 No. 1, RV 269 "Spring": I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc87b54358e48b5cd3771565ca2612636b7b9754634e8a62eafd342d3e26997c. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/DEU241102887 — a six-check JSON result.
Vivaldi: Concerti per oboe, archi & continuo