right|thumb|350px|Pieter Wispelwey accompanied by Dejan Lazic, picture: Fai Ho Pieter Wispelwey (born 25 September 1962) is a Dutch cellist. In 1992, he was the first cellist to receive the Netherla
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 0x4c577fd1f0588bab01993987b9fc50bccbbfe5ea4fca4140e3f2cc31049f8e3b. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/10ef69cb-bcef-4929-902c-ef2cb87c439f.json and https://artists.proofprofile.net/proofs/artist/10ef69cb-bcef-4929-902c-ef2cb87c439f.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Kodály, Escher, Crumb, Cello Solo Sonatas
Dvořák: Concerto for Cello and Orchestra in B Minor
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 0xf2749b75ee2adba7963639165defa3d7b15558013074042e604d0e05b1bd5d5f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/NLA460711091.
Requiem for Cello Alone: VI. Lux aeterna
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6446ebd05283ac8500fe9c3e26b3afed9c9b9c06dc2877b6aa4d60abee3231d1. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T18:56:28Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NLA460711093.
Dvořák: Concerto for Cello & Orchestra, etc
Poulenc / Fauré / Chopin: Pieter Wispelwey and Paolo Giacometti
Benjamin Britten, The Three Suites for Cello Solo
Shostakovich / Kodaly: Concerto No.1 for Cello and Orchestra / Sonata for Cello Solo Op.8
Shostakovich, Prokofiev & Britten: Sonatas for Cello and Piano
Shostakovich / Prokofiev / Britten: Sonatas For Cello And Piano
Chopin, Fauré & Poulenc: Works for Cello and Piano
Tchaikovsky: Variations on a Rococo Theme, Andante Cantabile - Saint-Saëns: Cello Concerto No. 1 - Bruch: Kol Nidrei
String Quartet No. 1 in D Major, Op. 11, TH 111: II. Andante cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a626911bb78c233957803807990a2cfec1b5f9dd6783138491906359fd0e37. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/NLA460610571.
Kol Nidrei, Op. 47: Adagio ma non troppo - Un poo più animato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7292ceb0b5d72760ed9a5066ce8d90308ca15f580d0285405afac0c379543acd. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/NLA460610580.
Shostakovich: Cello Concerto No. 1 - Kodály: Sonata for Cello Solo, Op. 8
Shostakovich: Concerto No. 2 in G Major for Cello and Orchestra, Op. 126 - Britten: Third Suite for Cello Solo, Op. 87
Shostakovich: Cello Concerto No. 2 in G Major, Op. 126 - Britten: Cello Suite No. 3, Op. 87
Prokofiev: Sinfonia Concertante, Tcherepnin: Suite for Cello, Crumb: Sonata for Cello
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6949820fd858b2d5aa2eed83c2208ce0978892f01bd1f5d7ad245dc2078df48e. 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/GBPCP1100237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63d575faf18708737fc4edee7ccba4c7ead5b701e9e6a2a1c8a0b01aca32153. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/GBPCP1100239.
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
F. Schubert, J. Brahms: The Complete Duos - Phantasie
Fantasy in C for Cello and Piano, D. 934: Andante molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675b920326cb529068b2584df1f0d3a08493c5612454e10ff224f465f1776924. 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/BEY681500020.
Second Suite for Cello Solo Op. 131C: No. 2, Largo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab5938a2542a7932d677be5c7aafd65881dd0387e06b6df34b68b42e5e1a6cb. 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/BEY681500028.
Sonatina in G minor for Cello and Piano, D. 408: Allegro giusto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f12dd9fd38de6a7a1ccb7ac04af559a17c8889ef9454bc1bf08dd1360a751cb. 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/BEY681500029.
Sonatina in G minor for Cello and Piano, D. 408: Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x175172c9171605d7a49b509e7e95a8776122098862ee6db915dd83f42743fe1f. 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/BEY681500030.
Fantasy in C for Cello and Piano, D. 934: Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0e0934e79a7a282cd77ade3c12c4f46be694d8f4b5964a3db1b3cf76204c0b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEY681500021.
Fantasy in C for Cello and Piano, D. 934: Andantino
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x481a2252c236571e26b0bde115a55d937654124b65f7dde1cde379b0d735fed1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEY681500022.
Fantasy in C for Cello and Piano, D. 934: Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b1b5e6e3e3d3e783f48decdd3cb8b15c42b2039b5159464bd6072fcd4be4c1e. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/BEY681500023.
First Suite for Cello Solo Op. 131C: No. 1, Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf89273d5ac904ac1ecbb6cae6f37c2ccd120d613c5d70c344ba6131abc027750. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEY681500024.
Sonata in E-flat Major for Cello and Piano Op. 120: No. 2, Allegro amabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2c5edd5454bf41aea691f57d22ae936a017d2b2ead5734a12a65cd782e96261. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/BEY681500025.
Sonata in E-flat Major for Cello and Piano Op. 120: No. 2, Allegro appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36e461d5b11332ef4bc45d558b0f3dd3aa4797b30b755da5cdeef937e7ee5dbb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEY681500026.
Sonata in E-flat Major for Cello and Piano Op. 120: No. 2, Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2c50154f451dcdb9d421f6436de1bd39ca96ffc7360350be2acba17492f211. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/BEY681500027.
Sonatina in G minor for Cello and Piano, D. 408: Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66a9a90df0b8c6c341d41897c7693d00481f64fb4c0d4a38a3c54f8bc6e9605a. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/BEY681500032.
F. Schubert, J. Brahms: The Complete Duos - Opus 100
F. Schubert & J. Brahms: The Complete Duos - Coda