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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae3944273729ba8dc920633e3ec9c4ea2a2e0b751d97a1f2deb6b568df889dca. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). 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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcf974756344e8113be5e9b08516a77f0b0a725153d3205565ed66ac665d219. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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 956891 (2026-07-06T07:16:32Z), 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/NOFHH1734007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f58d2b2192e6231ecba4805c0ca069d87a1948d045fcd9a07d6340c31f975d2. 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/NOFHH1734009.
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)
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18f4699bb406b7bb482ee17f64eaf5b2fbd9186b501ad2aef3f949be991207f7. 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/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.
Mozart: Clarinet Concerto in A Major, K. 622 & Clarinet Quintet in A Major, K. 581
Clarinet Concerto in A Major, K. 622: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x830678af405ca4cf236ee3748186d45e64772ec53b65fcbcc0747752e70cc97d. 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/SEAEM0263010.
Clarinet Concerto in A Major, K. 622: II. Adagio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c1d0908ffb9d8915b09ae22f8b3c8e6ece4825ccf08a934090a5e823e6ab075. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SEAEM0263020.
Clarinet Concerto in A Major, K. 622: III. Rondo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188103d4c849799ae0818402d4d23235521b63e7f23cd14602767d543e387214. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEM0263030.
Clarinet Quintet in A Major, K. 581: I. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4731b83f5e7eb4dc7c7e87d072cb5437a3ddb6d193e3c24dbd24126e5244efc. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEM0263040.
Clarinet Quintet in A Major, K. 581: IV. Allegretto con variazioni
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c3be0081b78bcf9bbf2253fa0b108654954ecceed9a164357f23be9cbb13b6. 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/SEAEM0263070.
Clarinet Quintet in A Major, K. 581: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1e40e3360e1e5da2b04d32fde2a78c78898486ffff7acb576ebf6ffbcc1b56a. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:06:03Z), 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/SEAEM0263050.
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
Clarinet Quintet in A Major, K. 581: III. Menuetto - Trio I - Trio II
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2bbc05e3c3d74f7a139f0d2cdf46f727c17312a517765a4b582846bbdb581c2. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/SEAEM0263060.
Great Composers in Words & Music: Claude Debussy
Watch - Music for Strings, piano and electronics by Jostein Stalheim
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d9eb72b208c42cbeaebb6e2ab956a1a60444ead0cb875a9dd7b473f34e8cbe0. 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/NOEHX2526010.
Beethoven: String Quartet No. 13 in B Flat Major, Op. 130
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee87b4ab9276d06118bcdfec47b03b0e25010a642c0e0a607f208ed884c1f94. 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/NOFHH0596100.
String Quartet No. 2, Op. 36: II. Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9613c6ee52ab2544e8bf9f52f2d600ff392dc6f94f30a7c773d346eb0d90f7f8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/HKI190054002.
6 Pieces for Harp Solo: No. 2, Scherzetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb62c253f40c2840e73d94a60682f19e88349273ac07e0d1780c99e0bf1033bd9. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI190054004.
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.
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.
Suite bergamasque: Suite Bergamasque: Clair de lune
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb5186642e5396db62f4a7c42a0a62573f39295a0650da347d5f74e1fd8f78f. 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/HKI199241709.
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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Preludes, Book 1: No. 8: La fille aux cheveux de lin
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x772b7c9ac367c2072427b9117a7eb43cca1743ced52e9084b2fc676048b58e28. 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/HKI199524708.
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 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.