Friedrich Seitz (12 June 1848, Günthersleben-Wechmar, Saxe-Coburg and Gotha – 22 May 1918) was a German Romantic Era composer. He was a violinist who served as a concertmaster, who wrote chamber music
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 0xf540a8285f3880a1dd1dd33d15139723e133594a427e4810a7966d3bc69bf47b. 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/2f11df0c-29cd-4405-bf82-eee49be3f723.json and https://artists.proofprofile.net/proofs/artist/2f11df0c-29cd-4405-bf82-eee49be3f723.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Play it - Study-Album for Violin: Friedrich Seitz, Student Concerto / Schüler-Konzert No. 2, Op. 13 in G Major / G-Dur (Piano accompaniment / Klavierbegleitung)
Play it - Study-Album for Violin: Friedrich Seitz, Student Concerto / Schüler-Konzert No. 5, D Major / D-Dur, Op. 22 (Piano accompaniment / Klavierbegleitung)
Play it - Study-Album for Violin: Friedrich Seitz, Student Concerto / Schüler-Konzert No. 3, G Minor / G-Moll, Op. 12 (Piano accompaniment / Klavierbegleitung)
ザイツ：ヴァイオリンとピアノのための学生協奏曲全集
Seitz: Pupil's Concertos Complete for Violin and Piano
Violin Concerto No. 2 in G Major, Op. 13: I. Allegro non troppo
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 0xecaa8047cdbd4c4419b53bc7c3ce7131571523f51737669ed6f0c30a813e0402. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/HKI191708604.
Violin Concerto No. 2 in G Major, Op. 13: II. Adagio
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Violin Concerto No. 2 in G Major, Op. 13: III. Allegretto moderato
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Violin Concerto No. 3 in G Minor, Op. 12: I. Allegro risoluto
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Violin Concerto No. 5 in D Major, Op. 22: I. Allegro moderato
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Violin Concerto No. 5 in D Major, Op. 22: III. Rondo. Allegretto
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa6fe451677ffca5b78998ad831586e3cc39f4c4d17a8b8a891bb0819e732a37e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI191708606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x623746cd60c3a5d71f78d41b98a6bee741d136a0f3ccfefbc3fc0c059f0ba599. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/HKI191708607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x055ea95a849748aa96f5b6db72187a409ff38e31a0bcc53057c9e1f1dc8d70d9. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/HKI191708613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32058cceb81830b2a6cc097ff731b753222d295c2d27ae1513fab43e233c3e38. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/HKI191708615.
Violin Concerto No. 9 in D Major, Op. 50: II. Adagio molto cantabile
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Friedrich Seitz: Student Concerto No.5, Op.22
Violin Concerto No. 2 in G Major, Op. 13: III. Allegro moderato
Takako Nishizaki Plays Suzuki Evergreens, Vol. 3
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Violin Concerto No. 5, Op. 22 (arr. for violin and piano): I. Allegro moderato
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Violin Concerto No. 5, Op. 22 (arr. for violin and piano): III. Rondo
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Violin Concerto No. 5, Op. 22 (arr. for violin and piano): II. Andante cantabile
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Seitz: Student concerto No. 5, Op. 22 in D Major: I. Allegro moderato
Student Violin Concertos: Conciertos para Violín y Piano
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Seitz: Student Concerto No. 2 in G Major, Op. 13: I. Allegro non troppo -
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Seitz: Student Concerto No. 2 in G Major, Op. 13: III. Allegretto moderato
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Seitz: Student concerto No. 5, Op. 22 in D Major: II. Andante cantabile
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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
Seitz: Student concerto No. 5, Op. 22 in D Major: III. Rondo: Allegreto
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Seitz: Student Concerto No. 2 in G Major, Op. 13: II. Adagio -
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