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 0xb931a0dab797300cb9b77b43c246899be3ff4af52ce7d2eea99163921f27b5d0. 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/e47a5639-c629-420a-9270-e30cc99889bc.json and https://artists.proofprofile.net/proofs/artist/e47a5639-c629-420a-9270-e30cc99889bc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
J.S. Bach, Bartók & Boulez: Works for Solo Violin
Britten & Elgar: Sea Interludes, Violin Concerto
Violin Sonata in G Minor, L. 140: I. Allegro vivo
Debussy: Fantaisie, Violin Sonata, Cello Sonata, La mer
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 0xae8a55a628d5a8042db8ac43043a491919094344a260a29dfdcd4071ec1ba1e0. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/DEN961803741.
Violin Sonata in G Minor, L. 140: II. Intermède. Fantasque et léger
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba15a2b419dcc1711defc16f6f7be51a798019777e2520919208d912371a61c7. 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/DEN961803742.
Violin Sonata in G Minor, L. 140: III. Finale. Très animé
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfd06b37eb2513953c0d8e9445582be781bbf77be4bf8883d65c175ac6165959. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/DEN961803743.
Piano Trio No. 1 in E Flat Major, Op. 1 No. 1: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2340704bdb3c61a74d7ea50a247814b4c328af0e563328513fdb2757f1e1ba4. 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/DEN961904121.
Piano Trio No. 1 in E Flat Major, Op. 1 No. 1: II. Adagio cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b192910fe0101c7c3005a2e031dd843a5ded2142b97d8684919a2edaf1a6fd. 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/DEN961904122.
Piano Trio No. 1 in E Flat Major, Op. 1 No. 1: III. Scherzo. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x422f1eec78e7f4cdd211c2aa788bb87dba826351b122b44b65d8156b27ef7ee1. 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/DEN961904123.
Piano Trio No. 1 in E Flat Major, Op. 1 No. 1: IV. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe453484290dadaf3e51beb281aa917189621723692415d7d41e2edcc72b9bbdd. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEN961904124.
Piano Trio No. 2 in G Major, Op. 1 No. 2: I. Adagio - Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15dca7cafdb9b01ae9cbead5a811e8fd073f9ae218407c2db10600d2128c64d3. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEN961904131.
Piano Trio No. 2 in G Major, Op. 1 No. 2: II. Largo con espressione
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8538af698a228f15187e4155840b60a497d323e25d711ba94e319add54bfb31c. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/DEN961904132.
Piano Trio No. 2 in G Major, Op. 1 No. 2: III. Scherzo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ced08970eff006780f1ebd67333e8b962ea920188d50fd890df9fbae50d6020. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DEN961904133.
Piano Trio No. 2 in G Major, Op. 1 No. 2: IV. Finale. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd43a00bcce3d1a9d6f5ae01d73331a3dc07266c403796d7dfdf6708bab75228. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEN961904134.
Piano Trio No. 3 in C Minor, Op. 1 No. 3: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ce07a2b0eaae744ef3bed036c8120f511601b9464a62bc28ee3adcc9849f94. 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/DEN961904141.
Piano Trio No. 3 in C Minor, Op. 1 No. 3: II. Andante cantabile con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc4a0d01a4fb75d371cf652661a88926c316022a9d2c7b598261ae32dd1c4acf. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/DEN961904142.
Piano Trio No. 3 in C Minor, Op. 1 No. 3: III. Menuetto. Quasi allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9ff75b7465f9b4b450af1643029c3f7f427da333c202ab2159c1ab1d2cac69e. Chain 2 (Bitcoin): anchored in block 960167 (2026-07-29T23:42:34Z), 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/DEN961904143.
Piano Trio No. 3 in C Minor, Op. 1 No. 3: IV. Finale. Prestissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c93f7992c3a39e7ee71698ee67d4941c30fccd3a45d6a318654314a87d5da96. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/DEN961904144.
Piano Trio No. 7 in B Flat Major, Op. 97 "Archduke": I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c23c4eecfa11d4e61d2aa5107f23624b5fd4b94ffb17d560f855f93ebe6880f. 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/DEN961904151.
Piano Trio No. 7 in B Flat Major, Op. 97 "Archduke": II. Scherzo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02ceaee647665e783af43fecb7156af2c8ed6e2f5b216a8acce5c46c7dacfb78. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/DEN961904152.
Piano Trio No. 7 in B Flat Major, Op. 97 "Archduke": III. Andante cantabile, ma però con moto - Poco più adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c2312e26ba87d18883d71f5d3d2cbb3c180d404a52347120fe668c86d429458. 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/DEN961904153.
Piano Trio No. 7 in B Flat Major, Op. 97 "Archduke": IV. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47a209d244185bf5ea84bdfb1096f534518f39212736b96f95a188d31e328c6f. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/DEN961904154.
Piano Trio No. 5 in D Major, Op. 70 No. 1 "Geistertrio": I. Allegro vivace e con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65e2b727cf9bf7a80b7a23647b586c2cdad1e865354476f632e3e20d4800efe4. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/DEN961904161.