Vertavo String Quartet is a Norwegian group founded in Hamar in 1984. The four women forming the quartet are Øyvor Volle, Annabelle Meare, Berit Cardas, and Bjørg Lewis. They appeared on the album A P
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 0xae3944273729ba8dc920633e3ec9c4ea2a2e0b751d97a1f2deb6b568df889dca. Chain 2 (Bitcoin): anchored in block 954038 (2026-06-17T02:57:22Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/3dfe1b19-1b05-425a-89aa-ca0023a75a85.json and https://artists.proofprofile.net/proofs/artist/3dfe1b19-1b05-425a-89aa-ca0023a75a85.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 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 0xe59a7049cdf68caec3265c76bfebf7285cdc09a307f5d621ff69467817b4814e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFHH1734001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcf974756344e8113be5e9b08516a77f0b0a725153d3205565ed66ac665d219. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/NOFHH1734002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x66befedcaedfaf9d0631a0ba098c95240ef3a6fc80617744e54222d3b599d1f4. 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/NOFHH1734007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f58d2b2192e6231ecba4805c0ca069d87a1948d045fcd9a07d6340c31f975d2. 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/NOFHH1734009.
Fabio Lossani's Quintetto Ritmico Di Milano
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd28c50f6c64e382fd51ed3268e58e1aee349e1c0ce5cf95e8c1d2ac572e9c97b. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NOFHH1734014.
Three Compositions. The Finnskogen Exhibition Norway (Live Recordings)
Horn Quintet in E-Flat Major, K. 407: I. Allegro
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Horn Quintet in E-Flat Major, K. 407: II. Andante
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Horn Quintet in E-Flat Major, K. 407: III. Rondeau. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4040285e3b11c95adae19f27a58065bf69c37956dad79b36f7e610e2abda00b3. 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/DEA140418407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ebf62157345e4fc2b0a027588810a0ab645e1b0d1635c92a11abd3a3bfe2cb9. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOUM70900181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87dd25f74fcd5c86797c39c11e443b3d86c3333feaac35d2f167488a99cbaa3f. 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/NOUM70900196.
Kong Valemon Og Prinsessen (Kjærlighetstema)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f84f4605b9057baec49e7a663251dc82afbf69acbc10869fdc6261af0f54069. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DEB330179401.
Adagio Sostenuto (2nd Mvt From Violin Concerto In E Minor)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f4699bb406b7bb482ee17f64eaf5b2fbd9186b501ad2aef3f949be991207f7. 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/NOFHH9702010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f4842fa1933a076f3d40250bce84293c4cfaed9e990624e30158776be2a1abd. 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/NOFHH9702020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ec4c547027347cda13e5491aa6e2227e2dfc8aef0047c7b550cd341af0f1ebf. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFHH9702030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ef2e5da615b44c2508f39e6ad92035b94178b89a999f475e9fb37f719910a2. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/NOFHH9702040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd817cdd9fed0d4a360e33cc786be4b0fcfb5d6ce725729e24d31620b7b9e20d. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/NOFHH9702060.
Mozart: Clarinet Concerto in A Major, K. 622 & Clarinet Quintet in A Major, K. 581
Clarinet Concerto in A Major, K. 622: I. Allegro
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Clarinet Concerto in A Major, K. 622: II. Adagio
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Clarinet Concerto in A Major, K. 622: III. Rondo. Allegro
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Clarinet Quintet in A Major, K. 581: I. Allegro
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Clarinet Quintet in A Major, K. 581: II. Larghetto
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Clarinet Quintet in A Major, K. 581: III. Menuetto - Trio I - Trio II
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Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
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Great Composers in Words & Music: Claude Debussy
Watch - Music for Strings, piano and electronics by Jostein Stalheim
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9003dd09c7bd506546febacd636da483d14fdec8f6c1ee39e118b6727dbd4cdf. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/NOEHX2526150.
String Quartet No. 2, Op. 36: I. Allegro calmo, senza rigore
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String Quartet No. 2, Op. 36: II. Vivace
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String Quartet No. 2, Op. 36 : III. Chacony sostenuto
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Beethoven: String Quartet No. 13 in B Flat Major, Op. 130
String Quartet No. 13 In B Flat Major, Op. 130: V. Cavatina: Adagio Molto Espressivo
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1485561927d35d622dfdc502220d5e292386ec48efbd3c25142cf9dbca9f0191. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOFZS0478100.
Alf Hurum: String Quartet a Minor/ Bendik Og Aarolilja/ Symphony D Minor
Vertavo (Live at Oslo Jazz Festival, 1995)
Carl Nielsen: String Quartets Op. 5 & 13
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b15bd03fc17983a915b06515db34a53c27caa43b0c3d1a1cffd7baa0d2f11f. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKI190054001.
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6 Pieces for Harp Solo: No. 2, Scherzetto
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2 Arabesques: No. 1, Andantino con moto (Arr. for Harp)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf906f92caa84ea0fdd7f6d56f21edd6a81edcec145b8858a267109919e30be34. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/HKI190054008.
Suite bergamasque: Suite Bergamasque: Clair de lune
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Children's Corner (arr. A. Caplet for orchestra): Serenade for the Doll
Rheinland-Pfalz State Philharmonic Orchestra
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Children's Corner (arr. A. Caplet for orchestra): The Snow is Dancing
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Children's Corner (arr. A. Caplet for orchestra): The Little Shepherd
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String Quartet No. 1 in G Minor, Op. 10: III. Andantino doucement expressif
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2 Danses, "Danses sacree et profane" (version for harp and solo strings): Danse profane
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35ee6dd4ccc64aadbd66ed288ade0ad9bef4778fb9855e55be510d3f744c5800. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/HKI190054011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda799dac640527a943e47d9d90ffd7c5ee87dabfdd1c19ce02bd35a01acc3678. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/HKI190054007.
Preludes, Book 1: No. 6: Des pas sur la neige
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5660403ffe5c9cf576a3cd0b78f37fdd5853407e5673def9d357c62bdaae9e12. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/HKI199616206.
Preludes, Book 1: No. 8: La fille aux cheveux de lin
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9905b8c4ff14cbe9f1645f3798a40898bc2a0aa16717dfa547e0f3430a60f589. 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/HKI199616208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772b7c9ac367c2072427b9117a7eb43cca1743ced52e9084b2fc676048b58e28. 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/HKI199524708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb545808f026cdf9e43e43d105c8c548ac874f4c87c5dffd4d5aab5a8108de02d. 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/NOFHH1224130.