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 0xde730892a908a06cb100532f80404f11c9bf0504a576257384e0027bd61733f4. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b815e3ae-26a0-419d-b0d1-72f9cb6e204e.json and https://artists.proofprofile.net/proofs/artist/b815e3ae-26a0-419d-b0d1-72f9cb6e204e.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
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 0xe0dad392a65150c250f613c6a814f92e8a44b2a3ba1b264ff96398fbf50e8471. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEFG22464801 — a six-check JSON result.
3 Mélodies, Op. 4: No. 2, Allegretto, H-U 420
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e1d82618c3a0de3d96e28e60cd180a1a80b35e7c256a87aefcf3e69f5d7ed88. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG22464802 — a six-check JSON result.
3 Mélodies, Op. 4: No. 3, Allegro molto quasi presto, H-U 364
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c9cb77c502df1c92531dace68d1e153acdd4599c3fde28d77e3f7b2a7617b48. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/DEFG22464803 — a six-check JSON result.
3 Mélodies, Op. 5: No. 4, Lento appassionato, H-U 438
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86c9963a37589204996e0b087abdefd7160b771e8cae63a6730d6408defef3da. 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/DEFG22464804 — a six-check JSON result.
3 Mélodies, Op. 5: No. 6, Andante soave, H-U 366
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x417a416178c7767a7976dcd648ba1e21bedf78a790cd2146ea3d5a93cf5bc2b7. 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/DEFG22464806 — a six-check JSON result.
4 Lieder, Op. 8: No. 4, Wanderlied, H-U 458
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe269fe2faa394a86c9ae9b99a8df36c2408cf46549887833bfa5cf1c7bd105a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEFG22464807 — a six-check JSON result.
Das jahr, H-U 385: No. 1, Januar - No. 2, Februar
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf22b114a4cd2334bbfe57d83ea813155380375b3b9e7fc84c0f2c833d741ebe3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG22464808 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3e97ca89f8813e487b7704184d46521690a79990140c0ce4c2c723159d18061. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG22464810 — a six-check JSON result.
4 Lieder, Op. 6: No. 1, Andante espressivo, H-U 454
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc30baf881ab29598ef02fccea0a8d4a3cc4581d2d7c7d65fd0bb09f35102191c. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/DEFG22464812 — a six-check JSON result.
4 Lieder, Op. 6: No. 3, Andante cantabile, H-U 424
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5f9091ab12ee0bb4a1d03f0e49a27fa2fd08ba811f3669f188de6e209a8a870. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG22464814 — a six-check JSON result.
4 Lieder, Op. 6: No. 4, Allegro molto, H-U 372
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53f476e9b91591fd62b6b06be77db7a3fd47d9b143f7bd916a299c057a953e1. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/DEFG22464815 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c638472fbac6c15b846011b19c13485da015493d7d6b6498bba52a9c3fffe76. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/DEFG22261501 — a six-check JSON result.
Klavierstück in E Major, H-U 330 "Andante con moto"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5db07f88f3291670140cd195e38e516ab260135533d3865d05c25b68be53887e. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/DEFG22261503 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ed45c3faf0fcb79dc00ad18d3ef5e809dec8f0780ddbacc19775edfa3c32588. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEFG22261507 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x928605b74777848e79b5859711dbb7d5c4bfc4e24c441825dc4d916ae54414b6. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEFG22261509 — a six-check JSON result.
In Der Stillen Mitternacht, H-U 280 "Allegro ma non troppo"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe29df619ee2a4300a8fbfe599ab6d1e1471d171e66fdf0d8a4f4c537c689939a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG22261513 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa553a52792a7a142ef11f80a49d0876245a8a669d03bdd8981952f7b7af55f2d. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/DEFG22261515 — a six-check JSON result.
Fanny Mendelssohn: Sonatensatz - Das Jahr - 6 Melodies - 4 Lieder
Trois mélodies pour le piano, Op. 5: No. 1 in B Major, Lento apassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5efa8a2ec2d63259845d35f6d94b031e5876a53207d9a94e043c5c87c9d24116. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR96X1700715 — a six-check JSON result.
Vier Lieder für das Pianoforte, Op. 6: No. 1 in A-Flat Major, Andante espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ad104ae65d0886b4638db5c79d039e3a339719aa65a9db46861365d93b62217. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/FR96X1700723 — a six-check JSON result.
Eugen d'Albert: Piano Suite in D Minor, Op. 1
Rarities Of Piano Music 1991 - Live Recording From The Husum Festival
Felix Mendelssohn Bartholdy: Orchestral Works arr. by the Composer for Piano for 4 Hands
Konzertouvertüre Nr. 2 „Die Hebriden“ op. 26: Konzertouvertüre Nr. 2 „Die Hebriden“ op. 26
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d612d6a102381f21ae9b682c5b4857b4151add64af0f9c3161037bdc9bc6dc1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEFG22466511 — a six-check JSON result.
Romantik aus den Fugen (Klavierwerke von Chopin, Rubinstein, Fauré, Glasunow und Saint-Saëns)
Reutter: Chamber Music, Lieder & Piano Works
Dvorák: Symphony No. 9 - Slavonic Dances, Op. 46
Klavierwerke von Komponistinnen aus drei Jahrhunderten
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb24377cea57941de2f2459178087c65e8bae26a13199b111a55ecee982e2def. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DERK81500201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc59e085f9c7571007c414fa23ffd0a8732cb540615342824b46518ee471d7393. 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/DERK81500206 — a six-check JSON result.
Bungert: Variations & Fugue, Op. 13 & Albumblätter, Op. 9
Mendelssohn: Piano Sonatas, Opp. 105 & 106
Johann Sebastian Bach: The Six Partitas, BWV 825 - 830 (Complete Recording)
Kirchner & Reinecke: Romantic Piano Music
10 Piano Pieces, Op. 2: No. 3 in D Minor, Nicht schnell, mit innigem Ausdruck
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c255c1a1637da985a45d878cc94ae82ecb9b684db8906484b483b553b06ceca. 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/FR96X1511565 — a six-check JSON result.
Baussnern: Suite No. 1 for Violin & Piano in G Major
Glazunov: Piano Sonata No. 2 in E Minor, Op. 75
Khachaturian: Piano Sonata in E-Flat Major
Rondo-Fantasie in E Major, Op. 19 - Single
Weber: Piano Sonata No. 1 in C Major, Op. 24, J. 138
Bruckner: Symphony No. 3 (Arranged for Piano 4 Hands by Gustav Mahler)
Schubert: Rosamunde (Arranged for Piano 4 Hands)