Steven John Isserlis (born 19 December 1958) is a British cellist. An acclaimed soloist, chamber musician, educator, writer and broadcaster, he is widely regarded as one of the leading musicians of h
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 0xce9adbcac3477e6ef1043c0b7518095bbc330bbea5a30282ba039c7be3af6cc8. 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/67fea0a8-0dec-4e23-b4be-10da907ca5ee.json and https://artists.proofprofile.net/proofs/artist/67fea0a8-0dec-4e23-b4be-10da907ca5ee.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x285192fed3ed708348dc4283ba1fa3a4e6d96bb54f4a50888f8c2f6e6fcd450e. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00f9e6ee3378304414f0cc8542d02ba4096260d3825d59a0d812305888f7b51f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022020.
Élégie in C Minor, Op. 24 (Version for Cello & Piano)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe584d13d26ecf6f94db1ddf457abf74b7d69d7635a4b9dd16e53020315c7d168. 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/SEAEB2022030.
Cello Sonata No. 1 in C Minor, Op. 32: III. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7edf00a679fad181d07c710f4f074109485598475fe9f70fd9a6d38ee31559. 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/SEAEB2022060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x675ef3026a5b0cc848322a6cf432ab7d339d5ea0a08f33e8c86637af7af80536. 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/SEAEB2022080.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): II. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba874a253b2444482dd94bbc56b20990c13ab501a53f7187ca77f338837febac. 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/SEAEB2022110.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): III. Recitativo-Fantasia
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aaa08e663d30fc017dd113f2335a3e672dae70ffbbd0741daf7623632ab7ce5. 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/SEAEB2022120.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): IV. Allegretto poco mosso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9de3cbd7f667770a58a7dd2d783cf4fc8e2928813758f1c1a5178def3f369ad. 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/SEAEB2022130.
Cello Sonata No. 1 in C Minor, Op. 32: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f6e2130a15774bcaae3974b0768818f8a96f186976190189030de7397c6fdc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022040.
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
Cello Sonata No. 1 in C Minor, Op. 32: II. Andante tranquillo e sostenuto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f802d9965a6be0c13efbf59cacc9795595d5de86c6078430517cc11b87253cb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022050.
Cello Sonata No. 1 in C Minor, Op. 32: III. Allegro quasi presto (Original Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5bc59ca96c743345be4bd044b90ab83644d26e7dd926b55a4fe4d66eea6843f1. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022070.
Récitatif et chant (After Holmès's "La vision de la reine")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7fa9fab4b15c10b3f1957607e1b05f147b8b286a3b9189db94b876e9d0990e. 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/SEAEB2022090.
Violin Sonata in A Major, FWV 8 (Arr. J. Delsart for Cello & Piano): I. Allegretto ben moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d34e179de7331f2861639fca9e3e28d8219865f1af8a01c890ca7daf4bf7b77. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEB2022100.
Schumann: Violin Sonata No. 2 in D Minor, Op. 121 (Arr. Isserlis for Cello & Piano): III. Leise, einfach
The Carnival of the Animals, R. 125: XIII. Le cygne (Arr. for Cello & 2 Pianos)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dff58717c7e8c8e627e16fbf77cebd9d75f8b6e5a2b23f26fc1e79121493280. 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/USBC19801420.
Tavener: The Protecting Veil: VIII. The Protecting Veil
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134842c7e4305815261343f09aa58866245a092e946f628078629fcd3e3c6763. 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/GBAYC9101350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dff58717c7e8c8e627e16fbf77cebd9d75f8b6e5a2b23f26fc1e79121493280. 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/USBC19801420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c2392954a27324a9f9d173d376d4af937c632a90205c3518b12071f4ecf93e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USBC19400532.
Adagio for Cello and Orchestra in G Major, Op. 38
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9a99e2c2f25238f5f7ba6016feffeea2d26d36400fac79a39deca72202c1220. 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/USBC19607742.