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 0x6a40ed48455c4c7628af0110b8a67013ec2cde66568eb1f614569f48aa43f705. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/61430a03-e0a3-43c1-8e9f-d7777fb599df.json and https://artists.proofprofile.net/proofs/artist/61430a03-e0a3-43c1-8e9f-d7777fb599df.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Le quattro stagioni (The Four Seasons), Concertos No. 1-4, Op. 8
Vivaldi: De Vier Jaargetijden (The Four Seasons / Le quattro stagioni)
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 0x0a784069dede26e7d0fe4de9e8481ceeedd2b549db04a8b71f9e5af066711611. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLHR51383326.
Concerto in G Minor, for Oboe, Strings & Harpsichord, RV 460
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6a06054d21e11940d2744758863f705a0d725e74b7e64d8ec7e39982dfdba1. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/NLHR51383327.
Concerto in A Minor for Violin, Oboe, Strings & Harpsichord, RV 522
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf85230e2a33f78fb1393fab48b974ccca02600bdbdcaab1723a6909fd789a795. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLHR51383328.
Herz und Mund und Tat und Leben, BWV 147: X. Jesu bleibet meine Freude (Jesu, Joy of Man's Desiring)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac1ab7682db81ea048688d762edf2d7455b7080513746f0ca82900dfd08ac77. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/USZDG0700025.