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 0x8bbfd7a4cce262f97094c520be142ba093b6eeb312377e54551c982bf00c36f5. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da6ab1e1-a13d-4b0d-965c-7479bd0f3099.json and https://artists.proofprofile.net/proofs/artist/da6ab1e1-a13d-4b0d-965c-7479bd0f3099.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Miniatures. Hidden Treasures of Heritage Piano
Schmetterling. Piano Music by Chopin, Schumann and Legacy
Preludes, Op. 28: No. 3 in G Major - Welte-Mignon 3184
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 0x567e84d2a6c4852e82c443d91aced819d72f904401689e345ca6f79d8b9ba3c9. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82307341 — a six-check JSON result.
Ecossaises, Op. 72: Three Ecossaises, Nos. 3, 4 & 5 - Duo-Art 5741
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3fedec31e94c3b0e1628c9fbd5116522344d7f36a24259d512e6f2eabf38eba. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82310316 — a six-check JSON result.
Lyrische Stucke, Op. 43: No. 4, Voeglein Birdling (Little Bird) - Welte-Mignon 1277
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9b21ad19a0f9045300ceb071353c1f4d67e6a339e6b0e880f1fe0c09d0fb189. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82321819 — a six-check JSON result.
Humoresques, Op. 101: No. 7, Poco Lento E Grazioso (G♭ Major) - Welte-Mignon 1324
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9096f333927684020789f1869b89a8ebb9a83879a2a3b701af77d93f9f63d51. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82305943 — a six-check JSON result.
Impromptu No. 1, Op. 29, A-Flat Major - Welte-Mignon 455
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95f94754439d5c0fc934c49eb4a5740588aecbaf3766451f571f44eb6ff6e7eb. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82319203 — a six-check JSON result.
Fantasie Impromptu, Op. 66, C-Sharp Minor - Duo-Art 6058
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48f692202a352625e197f428e2525ab567ac49a3b7e0f31814213a74935cecf7. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82307339 — a six-check JSON result.
Abendlied. Piano Music of Handel and Schumann. Visions from the Golden Age
Harmonies. Chopin, Mozart, Bach & Legacy Piano Music
St. Matthew Passion BWV 244 (Piano Arr. By S. Bagge), Pt 1: 28. Recitativ 'Der Heiland Fällt Vorseinem Vater Nieder'
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd99d7c8e40808558691107263c946f01fc61e6322f247fcb066fbea6ca9b3445. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82410795 — a six-check JSON result.
Notebook for Anna Magdalena: 23. Marche in E-Flat Major, BWV Ahn. 127
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cd305e1541eae8d736b13671f2810b5b4f2f47d563be1277b5359b8532d5562. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82406034 — a six-check JSON result.
Notebook for Anna Magdalena: 24. (Polonaise) in D Minor, BWV Ahn. 128
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474ea3b033c4b8cfb6c552a25ef97c8a09381d899ea9c36d685237267c7f2da7. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82406035 — a six-check JSON result.
Flute Sonata in E Minor, BWV 1034: III. Andante (Arr. For Piano by Irene Cantos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x120e17a89261c52ab156b141ba71012508f52a49e32191263cf1c2e185dac8d8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82308039 — a six-check JSON result.
Capriccio in B-Flat Major, BWV 992: III. Adagissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28c09d6a4a2a5efe5b72b49497955ca1480bb59d7df596b215e3d2cf0b7fe38b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82326725 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4b5484c3ad0697c48d171cea2c0028481bd1fbe20c97e0fadcf9b004f316e96. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82321785 — a six-check JSON result.
Chaconne in D Minor from Violin Partita BWV 1004 (Arr. By Busoni): Part II - Upon Piano Roll
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616b38ade73ae1a46360a438caa2be4c340534de270f8ee968f5334ee9c6cac8. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82312783 — a six-check JSON result.
Suite for Harpsichord, No. 14: Gavotte Varie - Welte-Mignon 540
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9b7c9ac935837e5cd066c6fcd1310dac642ffebdd422058af20d6878ad2e205. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82320111 — a six-check JSON result.
Barber of Seville: Overture (Arr. Solo Piano by Ganz) - Duo-Art 523-4
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51c2959a28064aaf8dca04c4e48067646b0daa6ab24d769d69f06deb77211348. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82313384 — a six-check JSON result.
Decorations. Piano Evocations from the Golden Age
Barcarolle No. 3, Op. 50 in G Minor - Triphonola T-51897
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72293903ba9faefa015083575c3619d617f398e1a33aa1b606ecfd3365a2d857. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82422612 — a six-check JSON result.
Nutcracker Suite, Op. 17a (Arr. Solo Piano by Giorni): Dance of the Reed Flutes (Danse Des Mirlitons) - Duo-Art 6132
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24e28db9463e852d73ffb9b205a553fb9c485377efcc6e0bfa3d7e105730f59. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82422534 — a six-check JSON result.
Bach in Time. Piano Works from the Golden Age
Fantasie. Heritage Piano Works of Bach and Chopin
Fleurettes. Piano Essentials from the Golden Age
Moments Musicaux, Op. 94: No. 3, in F Minor - Welte-Mignon 1211
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa317ca9f4ae3e2c771efee20e4bf0ca7f866ba838ff3ea3fd6e6b160355c7e78. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82322269 — a six-check JSON result.
Brazilian Dances, Op. 13: No. 4, Galhofeira - Duo-Art 66560
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x797eee21708ca24994b08f0ecaaf450e7743456bebc160cfdfaa696dc98866f5. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82322262 — a six-check JSON result.
Mouvement. Bach, Schubert & Ravel from the Golden Age.
Andante. Bach, Liszt & Debussy Piano Works
Well-Tempered Clavier, Book II: Prelude No. 12 in F Minor, BWV 881 - Welte-Mignon 544
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c5f3aa78ef456f2aee4974931dcc757ff58421007ef72f686804c73bfac1f4b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82307702 — a six-check JSON result.
Harmonies. Piano Music from the Golden Age
En Boheme, Op. 82: Bluette - Duo-Art 6178
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23a6bf905555073933ad224c382462bc0aeaaa1ac4286ff36c1c399e8e1ba482. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82409692 — a six-check JSON result.