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 0x1e7835179b4a5be67483e79d8ec3b58f9515a1e5033dd7afb176fa8c66a40e90. Chain 2 (Bitcoin): anchored in block 954014 (2026-06-16T22:46:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/31dadfb2-3318-49ad-8024-5b45320150c2.json and https://artists.proofprofile.net/proofs/artist/31dadfb2-3318-49ad-8024-5b45320150c2.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Beethoven: Triple Concerto, Op. 56 - Trio in B-flat Major, Op. 11
Beethoven: Complete Trios for Strings and Piano
Schubert: Piano Trio D 898 - Adagio D 897
Piano Trio No. 1 in B Flat, Op. 99 D.898: 1. Allegro moderato
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 0xbd86f355cc50b128626c6e654dffbef6a510a2107120fba95e389654254c7cec. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/ITUM71800702.
Piano Trio No. 1 in B Flat, Op. 99 D.898: 2. Andante un poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c7b3eb664688b9f58932e041955606474769975a25fb8689e8d06f8ade510fb. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ITUM71800703.
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
Adagio in E flat, Op. posth. 148 D.897 "Notturno"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x114426f2daca2b0230514f7dba892643198bdbb03ff354fa603219c8210ae6fc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITUM71800706.
Schubert: Piano Trio D929 - Sonatensatz D28
Piano Trio No. 2 in E flat, Op. 100 D.929: 1. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd60503263e4912f939f4316a02bdad61195cdab6437dfcfe6f07061433a42f02. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/ITUM71700107.
Piano Trio No. 2 in E flat, Op. 100 D.929: 2. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15fdf547572ce50e77846a7b4df325d284fbf186743ef8be8c21b7c0bd4fd865. 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/ITUM71700108.
Franz Liszt: Carneval de Pest - La Vallèe d'Obermann - Die Zelle in Nonnenwerth - Romance oublièe - Orphèe - Epithalam
Ildebrando Pizzetti: Trio in La, Tre Canti (Vol. 1)
Shostakovich: Complete Works for Piano Trio
Beethoven: Piano Trios and Variations Vol. 1
Ildebrando Pizzetti: Sonata in La per pianoforte e violino, Sonata in Fa per pianoforte e violoncello (Vol. 2)