Maria Kliegel (born 14 November 1952) is a German cellist. Professional career Kliegel was born in Dillenburg, Hesse. She studied under Janos Starker starting at the age of 19. She won first prize a
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 0x3991803458521323edf38dcc321c6ba1018fdc3b3707eb4001555778fae6f48c. 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/5cf59eac-7134-4d07-85ed-2a3f86010e96.json and https://artists.proofprofile.net/proofs/artist/5cf59eac-7134-4d07-85ed-2a3f86010e96.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Overture (Suite) No. 3 in D Major, Bwv 1068: Ii. Air
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 0x0382242ac8182259c2398d357dab3278520f46cf8576c8bc4bda5aefa7c5f8dd. 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/HKI199911316 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35edb3f1b4ae94b5582455b7b14e5f6b5c9dff0dede0065882612849f0bb0ddb. 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/HKI190423201 — a six-check JSON result.
Brandenburg Concerto No. 6 in B-flat Major, Bwv 1051: Ii. Adagio ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46ad32d02c7da769f4c62b1f148a2f183888b03ffd0f208867b11507d3491b5. 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/HKI199911112 — a six-check JSON result.
The Well-tempered Clavier, Book 1, Bwv 846-869: Prelude and Fugue No. 1 in C Major, Bwv 846
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5896afda42888f596b9a9417d7ed80caf86c25d2185946fccf4975bba5754f9. 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/HKI199627001 — a six-check JSON result.
Sonata No. 4 for Violin and Harpsichord in C Minor, Bwv 1017: I. Siciliano: Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24343c3a0cdf9599e777caf0cbaa0904e03358733746fe4bb12ba201397bedaf. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKI199910513 — a six-check JSON result.
Keyboard Concerto in F Minor, Bwv 1056: Ii. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827eb9645ea7c59ae415293e716b67649da6184331012e18a7000619da9fdb31. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/HKI199910811 — a six-check JSON result.
Flute Sonata in A Major, Bwv 1032: Ii. Largo e dolce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4257904cf9e5a580b01eaeb8875d87ec282cf164c928bd49d5a6bd702d6bfeb. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199608613 — a six-check JSON result.
Violin Sonata No. 3 in C Major, Bwv 1005: Iii. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81d21f732470101b03b9cb0e3c033861c3c9a5f7cec42bb8a7571b07a882267e. 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/HKI190782208 — a six-check JSON result.
Brandenburg Concerto No. 1 in F Major, Bwv 1046 (arr. E. Bindman for piano 4 hands): Ii. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5533de783a7b532bf8df2f7f4108d4c7524bc4dcf666b26bc21ee8a0ba9fbc50. 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/HKI191730402 — a six-check JSON result.
Concerto for 2 Violins in D Minor, Bwv 1043: Ii. Largo ma non tanto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5cb6f9704da25241f51e19768e8de39c7cb9b3d6bf2a4a2dc2824ad292befa. 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/HKI199207108 — a six-check JSON result.
Cello Suite No. 1 in G Major, Bwv 1007: I. Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74d69aa25b7dfef36059cb37cba6eed97e66028d717ed6fef111ad2360517bb. 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/HKI190446501 — a six-check JSON result.
Partita No. 2 in C Minor, Bwv 826: Iv. Sarabande
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cabc799c2b6233182bf4481c2a8ed919304d71fef7a4f6268d15356da0ab10. 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/HKI199279110 — a six-check JSON result.
Franck & Demus: Sonatas for Cello and Piano
4 Impromptus, Op. 90, D. 899: Impromptu No. 3 in G-flat Major
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x218f7044d6edd429d439aac1b736be6e9d7b392049648526dd67e47ef589f6fa. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/HKI199300603 — a six-check JSON result.
Wiegenlied, Op. 98, No. 2, D. 498 (arr. for orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7326ef74d582a793ad69b79efad20423c3f803b564f9e50be7d4380f688cad4. 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/HKI199827010 — a six-check JSON result.
6 Moments Musicaux, Op. 94, D. 780: No. 2 in A-flat Major: Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff154a49a90635fb1a0faef0053c1dd8ab2680afee08e08bc633848c5103ff2a. 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/HKI199300802 — a six-check JSON result.
Symphony No. 6 in C Major, D. 589: Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90160de0c1af8c9598d4af6459910907115618eea0e3a207e79d0c5120452736. 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/HKI199302606 — a six-check JSON result.
5 Stücke im Volkston (5 Pieces in Folk Style), Op. 102 (version for cello and piano): No. 2. Langsam
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda852ec598d2e5a22a418dbb54f82ae2d23c09c6f153af3665899ad4c8c9b9dd. 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/HKI199300405 — a six-check JSON result.
Piano Quintet In A Major, Op. 114, D. 667, "die Forelle" (The Trout): Ii. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd50e854a062fac85baa06dbe468b8e868ad0b231539d9ae8f31dfed5c54038. 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/HKI199300302 — a six-check JSON result.
Symphony No. 8 in B Minor, D. 759, "unfinished": Ii. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e896aa0909915ddeeeb2edb3f7f19a45dfe333e4d70d1a2124d362f3c566879. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI199302702 — a six-check JSON result.
Piano Trio No. 2 in E-flat Major, Op. 100, D. 929: Ii. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4877c53a22b809b9ad48eb4a3f3dcb9779f0c172e1e1625d5fc267a7ca70036d. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKI199301802 — a six-check JSON result.
6 Moments Musicaux, Op. 94, D. 780: No. 6 in A-flat Major: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb75f7880edccf41a29e97ad9ee4ba775cfdb88792028719df49591ac6bd83e01. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HKI199300806 — a six-check JSON result.
Adagio and Allegro, Op. 70 (version for cello and piano): Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05caf1d67c9f7c0648905b4321e65aec73f5fba4f6af0dca3460e4f384425e4f. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/HKI199300409 — a six-check JSON result.
Piano Sonata No. 3 in E Major, D. 459: Piano Sonata No. 3 in E Major, D. 459
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b0edcdaeab5a60a7001da690fcde2ed051435c11d197059f47edcf52322277f. 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/HKI190539207 — a six-check JSON result.
Cello Suite No. 1 in G Major, BWV 1007: I. Prelude
3 Songs, Op. 7, No. 1. Après un rêve: 3 Songs, Op. 7: No. 1, Après un rêve (Arr. For cello and piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99c7eb05a3e8716a78732dcedacd9b8f091fa694a22efcd655354109cc0ebc9d. 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/HKI190812512 — a six-check JSON result.
Cello Concerto in B Minor, Op. 104, B. 191: II. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69bb02f7185034d67e7b57ebc24a156f373a55f985bb92a32870cc7f0e1816dd. 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/HKI199243602 — a six-check JSON result.
Cello Concerto in E Minor, Op. 85: I. Adagio - Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdaae1446e493e6d8bbd609d94850966216f87d3d804694656194fcb33d6af7c. 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/HKI199809001 — a six-check JSON result.
Cello Sonata in G Minor, Op. 65: III. Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97d35b31261e153c71cbc1df9f6227dca5a97d167de7c0e5d8df87a91dffd0c3. 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/HKI199510503 — a six-check JSON result.
Gubaidulina: Seven Words / Silenzio / In Croce
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ae7ebce317ae4b26b0e7690313486928b1d30b355c91c8d2bd944b8c1ef0d8. 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/HKI199510603 — a six-check JSON result.
7 Worte (7 Words): Vater, vergib ihnen, denn sie wissen nicht, was sie tun (Father, forgive them....)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e5a2ad0850d9e42b7c4fd50f40043516d86efbb8b75a0c0aa5352ff8bf8a5dd. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/HKI199510607 — a six-check JSON result.
7 Worte (7 Words): Es ist vollbracht (It is accomplished)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30dfb339970a270cbe4c79738b33b2c6b06f1f6ff487ff70dcdc7feca2c8c40a. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKI199510612 — a six-check JSON result.