300px|thumb|right|Erland von Koch at his summer residence in Ornö, Sweden, in 1952. Sigurd Christian Jag Erland Vogt von Koch (26 April 1910 – 31 January 2009) was a Swedish composer. He wrote symphon
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 0x888e9ffc3e5c8dcdf1cc973ba463b796cb87311d149914d087634e027997ac45. 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/799c6e0f-5e66-44c7-8ccd-d4f3d817feba.json and https://artists.proofprofile.net/proofs/artist/799c6e0f-5e66-44c7-8ccd-d4f3d817feba.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 0xcca5b378881fa0831107272ca4e54de5cf0dfcb30eda4719ea0dfe5f2bdc41a7. 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/ATMA40501260.
Svenska sommarfavoriter 2 - Sommar, sommar, sommar (GöteborgsMusiken)
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Föreningen Svenska Tonsättare (Recorded 1918-1993)
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Nielsen: String Suite / Sallinen: String Quartet No. 3
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83357402e4e923e3077638ba873a34022eff2cb8091ad08e91da2954fdfb92e0. 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/SEUJB0101002.
Larsson, Wirén, Hedwall & Koch: Works for Orchestra
Trombone Concertino, Op. 45, No. 7*: I. Prelude: Allegro pomposo
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Trombone Concertino, Op. 45, No. 7*: II. Aria: Andante sostenuto
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Trombone Concertino, Op. 45, No. 7*: III. Finale: Allegro giocoso
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79174fb4006db32f305e9a7b64c1e00f0b72633d8f618268744462400a94454. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/HKI192219401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2751525005f994ebda7ac64cd3ef7f309ba31abd2118a762d5897d3b14ea3e7e. 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/HKI192219402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x384010a9a0fbecd4f006be0980dc10a2b879d8fc1b5178080446ade5920b0761. 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/HKI192219404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac02e0b4e03de6387346c2f0ce393c38b3312cd99db4b8d95d9ded59f68100e. 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/HKI192219408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfbafc066c5fe08d326eaf63015a0564994951a66fa6d8363a12171c2c529294. 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/HKI192219413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ae39b99ed3bc89de43ecdff41c172719ba04aa982aaab006b09bec00618447. 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/HKI192219417.
Erland von Koch: Symphony No. 3, Op. 38 & Symphony No. 4, Op. 51 "Sinfonia seria"
Koch: Lapland Metamorphoses & Impulsi Trilogy
Oxberg-trilogin: II. Lapplandmetamorfoser
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Impulsi-trilogin (Impulsi Trilogy): I. Impulsi
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Impulsi-trilogin (Impulsi Trilogy): II. Echi
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Impulsi-trilogin (Impulsi Trilogy): III. Ritmi
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Oxberg-trilogin: II. Lapplandmetamorfoser (Oxberg Trilogy: I. Lapland Metamorphoses)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c3f95f1bf5f793253ef131b93c58ff410da05d1c88f702a0a43e846edc7ede. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1150301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7efb6644354f2fb6dfdfb48d910dad12c9f48fe05e2508744294c1b44dedff. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1150302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe2fefaa887e7119d6602d00c827f5787fe07ca94cff7aede8aa50f999c44c75. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1150303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21d992719c0a65961475fa6bc6de32124b32fd007140da190464cd2027614c83. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1150304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a02d974a1a29e283f671325db6fac0780cdb3a0bb79008bd5544d94079b21a. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVOZ1150305.
Monologue No. 4 for Saxophone: I. Andante espressivo
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Monologue No. 4 for Saxophone: II. Allegro molto vivace
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Monologue No. 17 for Violoncello "On a Swedish Folk tune": I. Andante Semplice
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Monologue No. 17 for Violoncello "On a Swedish Folk tune": II. Allegro vivace
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06ed39ad133fe4d19989a8a54130a5b19645607ac46a70f07584820356cf8889. 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/QM6P41452175.
"Silver Tunes" Music for Flute and Organ
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3 Chansons de Charles d'Orléans, L. 92: III. Yver, vous n'estes qu'un vilain
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55fa0fed5e689867b707f1587608b4608a866bf5997b4a71a5751757950106db. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ea86450436e9b3bc6e5b41fa84ca66c178d0e4a9da3a260f6f15b53774f6e5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8361448c4b51bb6709d62b094510271cb9c156788b25e7dfdd78df22b47f7d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354f0a38059d0d85a616774f074e58235b6cf0a5f324773b446d0c41861bbad5. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67524f4117c9e770a10c8fc07188e22d0ed8799e71e5a9a15b2319f75fab772f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e71d2ec4a40ef31ad4f2bd9ef25eec35339cb1215b5a43bbcdfadf117aa8c41. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26c31df185f4731d1a1474c4b73444de075c79181b189a5676c3d605a8a4f28d. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEVWU1500311.
Drei Psalmen Op. 78. No 2: Denn Er hat seinen Engeln befohlen
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Un soir de neige, FP. 126: I. De grandes cuillèrs de neige
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Un soir de neige, FP. 126: II. La bonne neige
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Castelnuovo-Tedesco: Guitar Sonata / Simai: Impressions