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 0x82f1ef85e68f768915186c1cfbfa7b7408ece40d97044e33bffa486bc0e0ef23. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/953d1f07-9efc-4198-b3aa-a356508fc4fa.json and https://artists.proofprofile.net/proofs/artist/953d1f07-9efc-4198-b3aa-a356508fc4fa.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Berio / Xenakis / Turnage: Trombone Concertos Dedicated To Christian Lindberg
Violin Concerto in E Minor, Op. 64, MWV O14: I. Allegro molto appassionato
Mendelssohn & Shostakovich: Violin Concertos
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 0x4006b9b28404a8ee585816d5277c94ff3ef0d0bf73fba9d7dc8af2e2536fac90. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USSM10210752.
Violin Concerto in E Minor, Op. 64, MWV O14: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7319f8907dc00372cc8433e601fa529a06ece210493e323f0d232fa0525fa919. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USSM10210753.
Violin Concerto in E Minor, Op. 64, MWV O14: III. Allegretto non troppo - Allegro molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x298cfe227cd6d0ace9b388fde1eeff5ff71fd38e3433f43dcc6bfaaa6ce085c7. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/USSM10210754.
Violin Concerto No. 1 in A Minor, Op. 77: I. Nocturne. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72c6e63d84fa85e82168732ccba6512dce6b165eaf0247f518dc2fa719bd6eda. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USSM10211324.
Violin Concerto No. 1 in A Minor, Op. 77: II. Scherzo. Allegro non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b8179d3f77db0ec4f496adb36a4bd63c83cbf0d5ea26bf499ce5218a190a97e. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USSM10211325.
Violin Concerto No. 1 in A Minor, Op. 77: IIIa. Passacaglia. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f891bc32d76ebd59c532098af4d89cde4e656fd82f56d43398ca5ea9dd4451f. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/USSM10211326.
Violin Concerto No. 1 in A Minor, Op. 77: IIIb. Cadenza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa8b93a11154fabce00b7758596623e4eb4006fd8923a32024ebfd4f586792ca. 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/USSM10211327.
Violin Concerto No. 1 in A Minor, Op. 77: IV. Burlesque. Allegro con brio - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe72c4c9ffae166119f4b8a5a4f5a10b64a9f705e096d186fbea6152fde9c2e6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USSM10211328.