thumb|Emil von Sauer in 1919 with signature Emil Georg Conrad von Sauer (8 October 186227 April 1942) was a German composer, pianist, score editor, and music (piano) teacher. He was a student of Franz
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0741a9d3c2d6b0e728642493ba7f85ab031dbb239b51fc82aca2e4eef42043e. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0b85831b-6b9e-468c-8bad-566718470907.json and https://artists.proofprofile.net/proofs/artist/0b85831b-6b9e-468c-8bad-566718470907.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Printemps. Piano Evocations from the Golden Age
Lieder Ohne Worte. Op. 62: No. 1 in G Major - Welte-Mignon 1209
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeff3fbef481ca2ec377cf4f7bbbfa07743e765c56ef65acff77b8b4a176a92cb. 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/DEPI82322149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59ebe48aaf037f9bd22b5d86a66bf7120f449bdf494fa5ae24fe29c4700bae0a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82322142.
Paganini Etudes, S. 161: No. 3, "La Campanella"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d36b74ade77358449d21f9a0d3f57dccd7c72903ef32f9fcaaa464fbe96c7e5. 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/DEPI82322150.
Vestiges. Piano Music from the Golden Age
Wiegenlied. Piano Music of Brahms and Mozart. Visions from the Golden Age.
LISZT: PIANO CONCERTO No.1 "TRIANGLE CONCERTO", No.2, LES PRÉLUDES "SYMPHONIC POEM No.3", MEPHISTO WALTZ No.1 "ERSTER MEPHISTO-WALZER (DER TANZ IN DER DORFSCHENKE)"
Liszt: Concertos pour piano Nos. 1 & 2 (Recording in 1938, Mono Version)
Homage to Godowsky: Piano Works Dedicated to Leopold Godowsky
Willem Mengelberg Conducts Franz Schubert
Oubliée. Heritage Piano of Liszt, Chopin & Rachmaninoff
Miniatures. Hidden Treasures of Heritage Piano
Reinecke & Sauer: Piano Concertos (Hyperion Romantic Piano Concerto 87)
Piano Concerto No. 3 in C Major, Op. 144: II. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2d5d646b14644a0452fdf492e81e020f2e7acadb591efa2d39342e73478737. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/GBAJY2442902.
Sauer: Piano Concerto No. 2 in C Minor: IV. Allegro deciso, assai moderato
Piano Fantasies and Etudes by pupils of Franz Liszt - László Gyimesi
Women of Piano. Great Female Pianists of the Golden Age
Women of Piano. Great Female Artists of the Golden Age
Rendezvous. Piano Revelations from the Golden Age
Chanson Triste, Op. 40, No. 2 - Duo-Art 5957
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x995c68eadeb31b499af4206707e064fee71c25528371d2d82eb583f24ce17479. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82401792.
Le Vent Dans La Plaine. Debussy, Beethoven, Mozart and Legacy.
Marble Halls. Piano Revelations from the Golden Age
Valse Mignonne, Op. 104 in E-Flat Major - Welte-Mignon 803
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d8ae0ea1761b48d4b617a069cf13784720a58a0297c6d2795ad6e7cedc05e6b. 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/DEPI82321602.
Piano Music - Weber, C.M. Von / Liszt, F. / Mozart, W.A. / Chopin, F. (Welte-Mignon Piano at Hotel Waldhaus Sils Maria, Vol. 1)
Les Sylvains. Piano Evocations from the Golden Age
Two Concert Studies, S. 145: No. 2, Gnomenreigen (Dance of the Gnomes) - Duo-Art 081 Br
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21e7e51a74b9377d8e397aca0a050c62b8de7032490470db236edf0a06dfd21d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82439048.
The Seasons. Op. 37A.: No. 11, Troika (November) - Welte-Mignon 1956
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53a5048c7d7b95cb3f61b6371849db1d046583131e3299b051e11098f75b5626. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82439047.
Variations on 'Weinen, Klagen, Sorgen, Zagen' BWV 12 / S. 179 - Welte-Mignon 722
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6b874147323eda822205a321c910d02d201d6b8bce26118086e7f83ca99b3c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82439049.
Rendezvous. Piano Revelations from the Golden Age (Extended Edition)
Sauer & Scharwenka: Piano Concertos (Hyperion Romantic Piano Concerto 11)
Piano Concerto No. 4 in F Minor, Op. 82: III. Lento, mesto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7439cfe18d7c5abb6b1140dd17f5e5f449ca53ebb91843e2f0ab8d0ca7be5f68. 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/GBAJY9579003.
Piano Concerto No. 1 in E Minor: I. Allegro patetico
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x860196961f660512d38c7e8c2d3c5dfcd13ac21bcc1a371364373a4da74b7ecd. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJY9579005.
Piano Concerto No. 1 in E Minor: III. Cavatina. Larghetto amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31a88d79e0ac68e308b14c43cc2f83a52d6689301d9d1a6d47fc0117a0736b23. 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/GBAJY9579007.
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
Piano Concerto No. 1 in E Minor: II. Scherzo. Molto vivace – Andante con moto, quasi Allegretto – Tempo I
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0836c34cda3313a149da873d6b7c9a9dad4a0e27617ac1968c2f17f1887d2a5f. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBAJY9579006.
Piano Concerto No. 1 in E Minor: IV. Rondo. Tempo giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91aa5e2d797a68614ddc0e72b580a072a346bdf680c5aae37e4fb4216a64fb05. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBAJY9579008.
Great Piano Transcriptions from the Golden-Age
Samson Et Dalila: My Heart at Thy Sweet Voice - Welte-Mignon 2260
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26cf1ee06c5062668ca53f4ee2773807f08341f369aec54844ec03c6ee762740. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82307663.
Adelaide, Op. 46 (Arr. Solo Piano by Liszt) - Welte-Mignon 443
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe12909aca2420f6a7a8d2017a8fdb3ca98f3b1623b3c4473b18317aaa90c8c72. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEPI82320677.
Piano Concerto, Op. 16: II. Adagio (Arr. Solo Piano by Grainger) - Duo-Art 6479
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22fe0aceb9f2402e2e6d876cb8b1be3653943e60eabc8358870528f38975598b. 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/DEPI82308245.
Piano Concerto No. 26, "Coronation Concerto" in D Major K.537 (Arr. Solo Piano by Grunfeld): II. Larghetto - Duca 519
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d0d526cab090f7830de1d99496ff5bed7d604bf51486ef82e874ac5c143cff. 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/DEPI82324337.
Egmont, Op. 84: Overture (Arr. Solo Piano by Kohlberg) - Welte-Mignon 1801
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd72fed686a6ad032c1f6fba071966d33977d0f8df5afc78a3a9f64a9cae40600. 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/DEPI82314132.
Leonore Overture No. 3, Op. 72a (Arr. Solo Piano by Ritter) - Welte-Mignon 3130
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eb83e264e6da42cf47c65f2acfa37a1bc9039007d0eb18eb5c33539b3985bfc. 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/DEPI82320967.
Violin Sonata No. 2, Bourree in B Minor (Transcription by Saint-Saens) - Upon Piano Roll Duo-Art 67719, Issued 1924
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x538d9cae3c3557ed61076b6bfa829f4bc22f4b4536eaaf9e29088b77d2e30de7. 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/DEPI82440163.
Don Giovanni. Fantasia - Upon Piano Roll Welte-Mignon 876, Issued 1911
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd281054308da7314750ed59ba9cd1e097c75c379efee5a953efec7685f564218. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/DEPI82440161.
Alouettes. Piano Revelations from the Golden Age
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 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/DEPI82321819.
Kleine Suite, Op. 18: No. 3, Scherzo Humoristique - Duo-Art 5788
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d67ca957077dbe6b90cec4947322f0e3415ad8b321ab39b18fae16b58ed3fe. 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/DEPI82321768.
Spianato. Piano Music of Chopin, Schubert & Rachmaninoff
Egeria. Piano Revelations from the Golden Age
La Fontaine. Liszt and Bach from the Golden Age
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569122941ecc3492f91732ad1d09609fd82eb148ec65561a734cf884c20f2881. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/MXF019901703.
Rarities of Piano Music 1998 - Live Recordings from the Husum Festival
The Caswell Collection, Vol. 10 (1905-1926)
Sari Biro Legacy: Historic Performances (1944-1957)