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 0x04cb946d3eb130995a7a307249dd1ba5394d37ea888c5c9b79ef88facdac37d6. Chain 2 (Bitcoin): anchored in block 953746 (2026-06-15T05:25:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a6fb99e5-6192-4c8c-baf6-9c07d32ee700.json and https://artists.proofprofile.net/proofs/artist/a6fb99e5-6192-4c8c-baf6-9c07d32ee700.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Rieding: Violin Concertino, Op. 24 (Piano Accompaniment)
Rieding: Violin Concertino, Op. 25 (Piano Accompaniment)
Elgar: Salut d'Amour, Op. 12 (Piano Accompaniment)
Saint-Saëns: The Elephant (Piano Accompaniment)
Rieding: Violin Concerto, Op 36 (Piano Accompaniment)
Saint-Saëns: The Swan (Piano Accompaniment)
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 0xae7ed1d4393683b4d285ec9e16359549d173736a59b77691aa00c64acb9e06fb. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYX2141918.
Seitz: Student Concerto No. 5, Op. 22 (Piano Accompaniment)
Suzuki Violin Book 1 (Piano Accompaniment)
Twinkle, Twinkle, Little Star (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a5759a1ec7679049df38af4053b19d5eb1c6b40240fd13e8f2ab5f5ffd65a7. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/QZFYX2182990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9e429f1ce695d57d87d8f8e851d584d3179c2c6b02f10f4048cc4c7afca653b. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZFYX2182991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbea3a1b32f5f93131a4cab69f8934ba109d621e1da963c01f2d927a222902c8e. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZFYX2182992.
Go Tell Aunt Rhody (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ba3bb3bee3d13ab3f3e5d3ccc069ea1c4d82d16bc96682d570ada4869cced12. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYX2182993.
O Come, Little Children (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1244fa1e8ed232f63d0ca5a5e6ca9518a533e4a021f09156e6a668f3988c84e8. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZFYX2182994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22db30ed8c29bcc541a40b50c96f72c685a3d3421f919faeaec8c328ac18b975. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2182995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645f98339ac4192b431a459747034f3cf118480142490013e0bb8718c8d08b9b. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2182996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ccd51256734ae541f5dcaf67694611e420f6d54701f4fd11f0e1d1fafcbbfc7. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2182997.
Perpetual Motion in A Major (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5331a806b39daa5646948293faf77913ec3abf0759856fd464c75c49dfa1a932. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFYX2182998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe55ac3ddfefbf7d3d3f940ec612236a7576a8d84ffe717aa0ddccf12f2c94f9. Chain 2 (Bitcoin): anchored in block 958520 (2026-07-18T08:19:09Z), 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/QZFYX2182999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x559d09e557a3870c784a43a99b0d73660fcae57326d695f7e15863b0d0848ac2. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZFYX2183000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7949258eb2ea8beb75c94e3d33ab3d8d1ea6e9247fb8313a311240c5fd79c0. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2183001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff316096e14b4d89eb2748247a769449c77b99c1ee7345b852c8f9d9ee1fbc8. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZFYX2183002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c511214ab0ddfb8888849cb84a5430e97cb8f4d0bd5ecc645e25ae184d4af20. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFYX2183003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa027d7c467940c4d69c75fae9e93b50165470d17819e016bc1f674f7fafad346. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZFYX2183004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe104dfea1f35399b9bfd8ff965b55376ad21a7ad1ac40838bdad3d1f8ba6966. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZFYX2183005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4449beb4a3fa1421c9bb8383a1d1693ecc73c309931e0d9303baefea2f2a60. Chain 2 (Bitcoin): anchored in block 958529 (2026-07-18T09:21:41Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZFYX2183006.
Fauré: Élégie Op. 24 (Piano Accompaniment)
Schubert: Winterreise, D. 911 (Piano Accompaniment for Low Voice)
Rieding: Violin Concerto Op. 35 (Piano Accompaniment)
Telemann: Violin Concerto, TWV 51:g8 (Piano Accompaniment)
Keyper: Romance and Rondo (Piano Accompaniment)
Rieding: Violin Concertino in Hungarian Style, Op.21 (Piano Accompaniment)
Schubert: Ave Maria, D. 839 (Piano Accompaniment)
Suzuki Violin Book 2 (Piano Accompaniment)
Suzuki Violin Book 3 (Piano Accompaniment)
Vaccai: Practical Method of Italian Canto (Piano Accompaniment)
Elgar: Chanson de Nuit and Chanson de Matin, Op.15 (Piano Accompaniment)
Suzuki Cello Book 1 (Piano Accompaniment)
Massenet: Meditation From Thais (Piano Accompaniment)
Elgar: Very Easy Melodious Exercises in the First Position, Op. 22 (Piano Accompaniment)
Suzuki Cello Book 2 (Piano Accompaniment)
Suzuki Cello Vol. 2: II. May Time (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dfc3390d905d875917c10ce74cafa3760dbfaec78344ff6d71cf69f8f297758. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZHNC2147123.
Suzuki Cello Vol. 2: VII. Musette from English Suite No. 3 (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d70d2585eb4d0800f91bee340b487cb30b2276f7911fd1447409dcf7fd17b12. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/QZHNC2147128.
Fauré: Berceuse Op. 16 for Flute and Piano (Piano Accompaniment)
Saint-Saëns: Oboe Sonata, Op. 166 (Piano Accompaniment)
Küchler: Violin Concertino, Op.12 (Piano Accompaniment)
Poulenc: Clarinet Sonata (Piano Accompaniment)
Ravel: Vocalise-étude en forme de Habanera (Piano Accompaniment)
Accolay: Violin Concerto No.1 in A minor (Piano Accompaniment) [Fast Ending - Virtuoso Version]
Küchler: Violin Concertino, Op.11 (Piano Accompaniment)
Saint-Saëns: The Swan, C Major (Piano Accompaniment)
Goltermann: La Foi (Piano Accompaniment)
Caro laccio, dolce nodo (Piano Accompaniment)
Arie Antiche, Vol. 1 (Piano Accompaniment)
Saint-Saëns: Romance, Op. 36 (Piano Accompaniment)
Saint-Saëns: Allegro Appassionato, Op. 43 (Piano Accompaniment)
Rachmaninoff: Vocalise Op. 34, No. 14 (Piano Accompaniment) [E minor]
Monti: Csárdás (Piano Accompaniment) [Czardas]
Suzuki Cello Book 3 (Piano Accompaniment)
Fauré: Sicilienne Op. 78 (Piano Accompaniment)
Squire: Tarantella, Op. 23 (Piano Accompaniment)
Gounod: Ave Maria (Piano Accompaniment) [F Major]
Puccini: O mio babbino caro (Piano Accompaniment)
Fiocco: Allegro Op. 1 No. 10 (Piano Accompaniment)
Squire: Danse Rustique Op. 20 No. 5 (Piano Accompaniment)
Schumann: 5 Stücke im Volkston, Op.102 (Piano Accompaniment)
Bach: Air on the G String (Suite No. 3, BWV 1068) [Piano Accompaniment]
Glazunov: Elegy, Op. 44 (Piano Accompaniment)
Verdi: Ave Maria (Otello) [Piano Accompaniment]
Kreisler: Praeludium and Allegro in the Style of Pugnani (Piano Accompaniment)
Bruch: Kol Nidrei, Op.47 (Piano Accompaniment)
Fauré: Pie Jesu (Requiem, Op. 48) [Piano Accompaniment]
Küchler: Violin Concertino, Op.15 (Piano Accompaniment)
Piazzolla: Ave Maria (Piano Accompaniment)
Gluck: Minuet and Dance of the Blessed Spirits (Piano Accompaniment)
Suzuki Recorder School, Vol. 5 (Piano Accompaniment)
Accolay: Violin Concerto No. 1 in A minor (Piano Accompaniment) [Steady Ending - Student Version]
Brahms: Cello Sonata No. 1, Op. 38 (Piano Accompaniment)
Bruch: Ave Maria, Op. 61 (Piano Accompaniment)
Von Paradis: Sicilienne (Piano Accompaniment)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e32c1315a739df4fcc39b72e88753e7bf5cbb19c0138122b774b319a0cfe54c. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/QZK6K2317231.
Kreisler: Sicilienne and Rigaudon in the Style of Francoeur (Piano Accompaniment)
Fauré: 2 Songs, Op. 1 (Piano Accompaniment)
Hindemith: Trauermusik (Piano Accompaniment)
Schubert: Arpeggione Sonata, D. 821 (Piano Accompaniment)
Rachmaninoff: 2 Pieces, Op. 2 (Piano Accompaniment)
Glazunov: Rêverie, Op. 24 (Piano Accompaniment)
Brun: Romance, Op. 41 (Piano Accompaniment)
Glière: Four Pieces for Horn and Piano, Op. 35 (Piano Accompaniment)
Franz Strauss: Nocturno, Op. 7 (Piano Accompaniment)
Dvořák: Romance, Op. 11 (Piano Accompaniment)
Seitz: Student Concerto No. 2, Op. 13 (Piano Accompaniment)
Fauré: 2 Songs, Op. 2 (Piano Accompaniment)
Vivaldi: Violin Concerto in A minor, RV 356 (Piano Accompaniment)
Suzuki Violin Book 4 (Piano Accompaniment)
Fauré: 2 Songs, Op. 3 (Piano Accompaniment)
Kreisler: 3 Old viennese Dances (Piano Accompaniment)
Bréval: Concertino No. 1 in F Major (Piano Accompaniment)
Fauré: Fantaisie, Op. 79 (Piano Accompaniment)
Fauré: 2 Songs, Op. 4 (Piano Accompaniment)
Bréval: Cello Concerto No. 2, Op. 17 (Piano Accompaniment)
Elgar: Salut d'amour, Op. 12 (Piano Accompaniment)
Fauré: 3 Songs, Op. 5 (Piano Accompaniment)
Dvořák: Sonatina, Op. 100 (Piano Accompaniment)
Fauré: 3 Songs, Op. 6 (Piano Accompaniment)
Saint-Saëns: Extase (Piano Accompaniment)
Saint-Saëns: Aimons-Nous (Piano Accompaniment)
Fauré: 3 Songs, Op. 7 (Piano Accompaniment)
Elgar: Very Easy Melodious Exercises for Viola/Cello, Op. 22 (Piano Accompaniment)
Saint-Saëns: Désir d'amour (Piano Accompaniment)
Seitz: Album of Classical Sonatinas (Piano Accompaniment)