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 0xd64800f188abd0b0a29a7546a653c88624983a1eabd0aeab87ea2b84f8dcc26b. 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/435f7fbd-fc01-4acc-a9b0-c14f4b5bec8b.json and https://artists.proofprofile.net/proofs/artist/435f7fbd-fc01-4acc-a9b0-c14f4b5bec8b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Mascagni: Cavalleria rusticana (Arr. for Solo Piano)
Joachim Raff: Suites for Piano No. 1, Op. 69 & No. 2, Op. 71
Moszkowski: Caprice, Op. 4 / 6 Morceaux, Op. 31
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 0xef9876bf05d8ea58539d9f5b3f71f348129c0bae12225292e93473989e933bbe. 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/CH6542439516.
Moszkowski: Esquisses techniques, Op. 97 & 8 Morceaux caractéristiques, Op. 36
Moszkowski: 15 Études de Virtuosité, Op. 72 / Albumblatt, Op. 2
15 Études de Virtuosité, Op. 72: I. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd89b7c2dd4c0f10f0cb29f270b7c1120d7c85c7bd85d17c3318c61377c200fb. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/CH6542259410.
15 Études de Virtuosité, Op. 72: II. Allegro brillante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c49f9bb8be1d323bdc825709771330463b0cf79ab5eadf4364386dc4fd4b830. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/CH6542259409.
15 Études de Virtuosité, Op. 72: III. Vivo e con fuoco
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c75ae2a0106fc381b45c653c10bf68e120055c66b7b1ad73480ef8f0099642d. 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/CH6542259408.
15 Études de Virtuosité, Op. 72: IV. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca1bdb72c1c6d063462db461fafdd90f0c5f2a2e7f102ce202e89848e046069. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH6542259407.
15 Études de Virtuosité, Op. 72: V. Veloce e leggiero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3c500cd85017e64f11f23f1d0ce28e2816fc94fb48a0a69bd565ba27e4b22a9. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/CH6542259406.
15 Études de Virtuosité, Op. 72: VI. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa5cb1a39f4f12f17a4250c293abd4137727ce9cb197015553b223d39b07f8f3. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/CH6542259405.
15 Études de Virtuosité, Op. 72: VII. Allegro energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1b5aa994a0873193987bf5c4512f5a4114e4f0f8dcaa13bad1df90b1fedf6c6. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/CH6542259404.
15 Études de Virtuosité, Op. 72: VIII. Allegro energico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1709500db1702a78b964205f3337109305b2973815196809b8ebf25486f566d5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH6542257442.
15 Études de Virtuosité, Op. 72: IX. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78bd433eaddcfccf5dae47d78c0c7daa790d79853128bc64cd83c0d4241ee021. 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/CH6542257441.
15 Études de Virtuosité, Op. 72: X. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe92d74f484e705fe3ed8b0b5faadf641b64c4f23678dea3980db6612afbec4be. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH6542257440.
15 Études de Virtuosité, Op. 72: XI. Presto e con leggierezza
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c776d7ba04811dd19b4def1972f2f9355754663b2690c6fef19921ab71104d. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/CH6542257439.
15 Études de Virtuosité, Op. 72: XII. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd6f1b6686a85a5139a3a8e34ceac7622840d607a3ba5a1769860744dae929c. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CH6542257438.
15 Études de Virtuosité, Op. 72: XIII. Molto animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53340598ce824c4304d86cb741b928327fd692f81217ff7983ada6fe299eb150. 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/CH6542257437.
Francesco Durante: Piano Music, 6 Sonate & 10 Toccate
Sonate per cembalo divise in studii e divertimenti: Sonata No. 6 in B-Flat Major: Studio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae5e4080bf5988cb06e27e2c78c6314e1f7509a86d348c932673f01b22a87dd. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH6542357852.
Czerny: 50 Übungsstücke für Anfänger, Op. 481
6 Piano Sonatinas, Op. 19/20: Sonatina in F Major, C. 90: Allegro quasi Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0255c47724cbc95c99fe8c6ed5a8db9a9d80317e3ddff957162fe2b6ec82df. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/CH6542238885.
Stephen Heller: Promenades d'un Solitaire
Henri Bertini: 25 Études, Op. 100, 25 Études, Op. 29 & Deux Nocturnes, Op. 102
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d5fe3c4525237f5e03837e628b2664b757c413f912f59b0a43e78c40fef4759. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/CH6542005397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6ea37539759053f8936fd754e76ed914fbe11181a406ad1549f519b69bc14a3. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/CH6542005393.
25 Etudes, Op. 29: No. 11 in F-Sharp Minor
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b91a92ee453d34a5b0e37c4271846d2fe02a5a3f7d8907bf81ce7327fa95f75. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CH6542005639.