Christoph Schaffrath (1709 in Hohnstein, Electorate of Saxony 7 February 1763 in Berlin, Kingdom of Prussia) was a German musician and composer of the late Baroque to Classical transition era. Caree
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 0x336b06d0f06439edca214e25f4897b8e5d3092eaab397ad6b7f8adf7c99d36d0. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/73e997c6-66d3-4cfa-9dd6-af29f0a33934.json and https://artists.proofprofile.net/proofs/artist/73e997c6-66d3-4cfa-9dd6-af29f0a33934.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Schaffrath, C.: Harpsichord Sonatas, Op. 2, Nos. 1-6
Schaffrath: Duetto in A Minor: I. Allegro
From Mannheim to Berlin - Sonatas for Violoncello Piccolo
Boismortier, J.B.: Sonata, Op. 8, No. 3 / Schenck, J.: Sonata No. 8 / Schaffrath, C.: Duetto in D Minor
Chamber Music (German 18Th Century) - Janitsch, J.G. / Schaffrath, C. / Graun, J.G. (Il Gardellino)
Souper Galant, with the Bach Family and Friends on period instruments
Sonderlich auff Violen: Musiques des XVIIe et XVIIIe siècles pour les violes de gambe
The Musical Treasures Of Leufsta Bruk, Vol. 1
Berlin Castles (Music From) - Graun, J.G. / Frederick Ii / Benda, F. / Quantz, J.J. / August Wilhelm / Janitsch, J.G. / Bach, C.P.E.
Sinfonia in D Major, Wq. 183/1, H. 663: II. Largo
Carl Philipp Emanuel Bach Chamber Orchestra
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 0x95e286f3e98ff5a9d30ef74eef6d0ecca6422437c0ce5b6d733c77a2649f8e69. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/USB8U1014333.
Chamber Music (Baroque) - Frederick Iii / Schaffrath, C. / Bach, C.P.E. / Benda, F. / Janitsch, J.G. (Music From Sanssouci)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17a8b31746587690d6697affef0180aa9edeccdf066c0e5f88bcdab5c061fdde. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USB8U1011303.
Flute Sonata in E Minor: II. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91cf7d805cbacfcf7a53a326016586c9236ac2c5d6873dde910731ed39f95c2. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USB8U1011304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca96016fbfc1ef8c08989c46386d9cc622640ac2719005e7be1f2e4012814b0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USB8U1011305.
Duetto in D Minor, Op. 1: I. Poco allegro
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Viola da Gamba Sonata in C Major, Wq. 136, H. 558: II. Allegretto
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Violin Sonata in E-flat Major: III. Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ca58f288b38a918aff60d595496396fcd01edf9b650802ce78503aceb9aacb. 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/USB8U1011317.
Quartet in G Major: II. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x494b52a180b063dd2c5245197d7db012508110b14782b257adc00770daadba08. 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/USB8U1011319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b67b23c1359c5ebab00006ae80cf312c340e91e7309865a4583a46cae28c9cf. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/USB8U1011307.
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 0xfbc3a34749bad172fa5dd30df396ff30b6a7ec30cbacc5dfef8b17b01a047a43. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1011308.
Quartet in D Minor, TWV 43:d1: I. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb801203c24640e207355e8d9be107fdff84dbf06df5e4b14de407770a4b6cd5a. 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/BER181031401.
Sonata in F Minor, TWV 41:f1: II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ebd141b917977de9fdd995f4f3df4cc664bcc153e9e887a7b76082b99773d1. 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/BER181031406.
From Venice to Berlin: Baroque Trio Sonatas for Violin, Oboe and Continuo
Trio Sonata in D Major: II. Allegro - For violin, oboe and continuo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcabc1d3c32acdeed6cb648555b8f56aa618018b1489290e1d2abf60415a40864. 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/ITLF52414877.
Frederick II, Quantz, Graun, Schaffrath & C.P.E. Bach: Prussian Baroque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc086fbd7009e40a548eefc1a20b5a6591a7ca13b215ff4a0c6c752940c50a59c. 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/DEMQ20100101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276c6b88a62cbbda4c3ed62f92b984a2bb586d086bd65584c1601312255fdd5b. 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/DEMQ20100111.
The Art of Harpsichord Duets: 18th-Century Music for Two Harpsichords
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee6e3dd00a7f17b1dd9f07b0b30e4ea3937d504a7c68aea513f2b8b45c20b70. 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/ITLF52415354.
Orchestral Music (18th Century German) - NICHELMANN, C. / KIRNBERGER, J.P. / QUANTZ, J.J. / SCHAFFRATH, C. [Berlin Akademie fur Alte Musik]
Chamber Music (18Th Century) - Bach, C.P.E. / Schaffrath, C. / Zarth, G. / Graun, J.G.
Schreyfogel, Schaffrath & Visconti: Chamber Music
Chamber Music (Baroque) - Frederick Ii / Benda, F. / Bach, C.P.E. / Schaffrath, C. / Quantz, J.J.
Quantz, Schaffrath, Bach, Marais, Hotteterre - 18th Century Chamber Music
Classical Assembly. Valery Popov - Boddecker, Corrette, Boismortier, Merci, Fasch, Schaffrath
Bach - Händel - Veracini - Schaffrath - Purcell: Selected Works