Mayumi Seiler (born November 14, 1963) is a Canadian-Austrian violinist of Japanese/German parentage, born in Osaka, Japan. Education and career Starting the violin from the age of three, Seiler re
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 0x522dcb5b8e3555620f62635e2a014b7984e1407e24261d7c64ebaf5b893fe302. Chain 2 (Bitcoin): anchored in block 953678 (2026-06-14T19:23:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6299e356-6ae7-4fe7-acda-968839b149d3.json and https://artists.proofprofile.net/proofs/artist/6299e356-6ae7-4fe7-acda-968839b149d3.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Thaïs: Méditation (Arr. for String Ensemble by Kuan-Yu Huang and Mayumi Seiler)
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 0xd3821946f97e7deb639327ae32422f2aa1f69a9e40ad37ef59c15386c5806439. 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/CA4Q32400168 — a six-check JSON result.
Boccherini, L.: Chamber Music - G. 62, 223, 324, 336
String Quintet in C Major, Op. 30, No. 6, G. 324, "La musica notturna delle strade di Madrid": I. Ave Maria delle Parrochie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08bc6d4c40aabfc6d7a0dd2da609d38a65022712da58f0febb75a50e30a5b985. 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/US2TL0907101 — a six-check JSON result.
String Quintet in C Major, Op. 30, No. 6, G. 324, "La musica notturna delle strade di Madrid": II. Menuetto dei ciechi
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eb80b016fd3d0cfb1b8bf5b53f2839bf5a9c7a6562f9fcf3b068411607de082. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0907102 — a six-check JSON result.
String Quintet in C Major, Op. 30, No. 6, G. 324, "La musica notturna delle strade di Madrid": III. Largo assai Rosario
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49633874dc75c311522098089399917bc0a465245024ea6390b352bb7b2f9a45. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/US2TL0907103 — a six-check JSON result.
String Quintet in C Major, Op. 30, No. 6, G. 324, "La musica notturna delle strade di Madrid": IV. Allegro vivo, "Los Manolos"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf80ec28ecb92a74164b79ac93a0b1b0478190f97229023e640a9e775bc57549c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/US2TL0907104 — a six-check JSON result.
String Quintet in C Major, Op. 30, No. 6, G. 324, "La musica notturna delle strade di Madrid": V. Ritirata con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3402cf9888ffe530452eb03cc28ab62083f207294e43092b6d3e1a56429281b5. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/US2TL0907105 — a six-check JSON result.
String Quartet in G Major, Op. 44, No. 4, G. 223, "La Tiranna": I. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b88d195a89bd104adc0551904d2805ebbb8e4d2608c6b2e70643733c6d608b. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US2TL0907106 — a six-check JSON result.
String Quartet in G Major, Op. 44, No. 4, G. 223, "La Tiranna": II. Tempo di minuetto - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da7722547ceb0483d06abf6b4358407a5933f0c851333334af4afac4048e78c. Chain 2 (Bitcoin): anchored in block 960250 (2026-07-30T11:13:28Z), 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/US2TL0907107 — a six-check JSON result.
Duet for 2 Violins, G. 62, "La bonna notte": I. Amoroso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab9dda744055d5bd3c93e4ba7b654b3ea5b5cf62d34b33fbf7cccc0e9712d62a. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/US2TL0907108 — a six-check JSON result.
Duet for 2 Violins, G. 62, "La bonna notte": II. Rondo: Allegretto - Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe676c7d7d710862e36411a5d79e1c13151c965e6d866fbed057e2dcc671ff7b4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US2TL0907109 — a six-check JSON result.
Duet for 2 Violins, G. 62, "La bonna notte": III. Minuetto sostenuto - Trio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0324e525c4f4ece307ae109a51ac09d83c3f9ca31988f7c0d38df311e6bad5ea. 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/US2TL0907110 — a six-check JSON result.
String Quintet in F Major, Op. 36, No. 6, G. 336, "Dello scacciapensiero": I. Lento e amoroso - Allegro giusto dello scacciapensiero
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ab26561c7a1fac2543580d6f29dfd65e43cc03612b72c2a817ca83bd8341ba0. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/US2TL0907112 — a six-check JSON result.
String Quintet in F Major, Op. 36, No. 6, G. 336, "Dello scacciapensiero": II. Minuetto - Trio: Allegro assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601c17d9b2e0c39cfce8176adee39d5313a88808bb4378f34dd496ec18b0f365. 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/US2TL0907113 — a six-check JSON result.
Boccherini, L.: Sextets - Op. 23, Nos. 1, 3, 4, 6