Fredrik Karl Kristian Högberg, born 5 February 1971 in Vellinge, Sweden, is a Swedish composer and producer. He resides in the old courthouse in Nyland, Ångermanland (mid-Sweden). Fredrik Högberg gre
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 0x58b28435d28de8df79ae516e36cefaad5eb0174d6531aa26e5bfddc51ba52a43. Chain 2 (Bitcoin): anchored in block 954342 (2026-06-19T03:22:39Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/814cc28b-3774-4b0f-9d22-30455268d78b.json and https://artists.proofprofile.net/proofs/artist/814cc28b-3774-4b0f-9d22-30455268d78b.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Clarinet Concerto: I. Slowly and expressively - Cadenza
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 0xb13c35d1115df5bcfc4e881fa3d4506a3e8a01f2da991b3d76e6fe61e453900c. 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/SEAES1163010.
Clarinet Concerto: II. Rather fast - Coda (Final Version)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cc5d788b6e1e9afe9b62188f184ea49aad43b49b49758057e361257fe00b4ef. 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/SEAES1163020.
21 Hungarian Dances, WoO 1: No. 12, Presto (Arr. G. Frost for clarinet and orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd073311ad2de5e827bbae2a67e0441fff930432d6c9b05dabf0e808d052a476b. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/SEAES1163030.
21 Hungarian Dances, WoO 1: No. 21, Vivace - Più presto (Arr. G. Frost for clarinet and orchestra)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cd3a522bc471bce3205e9a4df44ff3cede1d121156391408b5df448b34ff5d. 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/SEAES1163060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d142432dc50c3148fdef3848d5c06bd3f8b6765427481753f8ea4efd4809a7. 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/SEAES1163070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23f3b77ba57e212a6a6b9d94ac08654c41ec7e755d7c038b1f4ca8ec20353b6d. 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/SEAES1163130.
Dancing with Silent Purpose: II. Expressive Rage
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d0ef23692623175282f96d68d474231e6b0dd61a71a6e5c5b49525adcb4594d. 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/SEAES1163160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a0c3ab5db890cd2afaf24809f6228f267d891bad864cae67c24b1e524fb6a9c. 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/SEAES1163190.
Dancing with Silent Purpose: I. I'm afraid of the dark …
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf4add7b4ca35a8aa093a2087e4a2e113e44a56b2806b63f1e50c0a710ed38b5. Chain 2 (Bitcoin): anchored in block 960384 (2026-07-31T09:54:03Z), 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/SEAES1163150.
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
Baadsvik, Oystein: Prelude, Fnugg and Riffs
Mozart: The Magic Flute Suite, K. 620 (Arr for Brass Ensemble)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fb2d17ef6016dd66ce4e26b884238e19b3f4b511993c2a7218e95ca7ad08a48. 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/SE5XG2361848.
Communion antiphon in the Latin Requiem Mass (ca. 400–600 AD)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e132c93113fe65741054fc055d2e3e77e29719d0ca42602caed818e35eef5e0. 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/SEBAA2200705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00399785e2d85af2348fc1f7d871725fcf5ddc09b658a8518db671aae8f55f5f. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/SEAEC2344210.
Close Ups: Music for Clarinet & Percussion
Tuba Concertos (21St Century) - Hogberg, F. / Sandstrom, J. / Aho, K.
Telemann / Sandstrom / Lindberg: Christian Lindberg Unaccompanied
Lindberg: Mandrake in the Corner / Arabenne
Shilkret: Trombone Concerto / Hogberg: Trombone Concerto / Lindberg: Helikon Wasp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e103935ccf63e7ba55a22d7ea42f18bdb38e7bbf1fce30f1764631da2af45f9. 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/SEAEM0213010.
NORRBOTTEN RHAPSODY-Norrbottens Kammarorkester
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1c56f5166d0dcc7f1ad0fca1849f200c584908f30af1b5d4cd5db38f9d13b7d. 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/USB8U1030426.
Paulsson: Date With A Soprano Saxophone (A)
Perspectives (69°42', North | 19°00' East)