Carl Gustav Sparre Olsen (April 25, 1903 – November 8, 1984) was a Norwegian violinist and composer. His composition style is lyrical with a strong grounding in Norwegian folk tunes.Sparre Olsen (St
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 0x0f0fc10ad3c02dcfa88967230ba3a1ebcaad48f0d8ee49a4b5c342642c11713c. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a2b195a8-6249-4f01-bbc8-95c3fe916545.json and https://artists.proofprofile.net/proofs/artist/a2b195a8-6249-4f01-bbc8-95c3fe916545.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Carl Gustav Sparre Olsen: Complete Piano Music
6 Gamle bygdevisur fra Lom (6 Old Village Songs from Lom), Op. 2 (version for violin and orchestra): No. 1. Andante
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 0x0e187483fd49807dcd707803235f19a4c3af80f0bbf1c44984b3a609d458abeb. 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/HKI191159101.
6 Gamle bygdevisur fra Lom (6 Old Village Songs from Lom), Op. 2 (version for violin and orchestra): No. 2. Lento
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c54d2a3e32e1dfb1110d044061e92a6cbb36269841315eae822a80746b32bf2. 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/HKI191159102.
6 Gamle bygdevisur fra Lom (6 Old Village Songs from Lom), Op. 2 (version for violin and orchestra): No. 5. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f3a4b5c5ee46d39bd70427b81df2f055689072666f342e53f70c57ced810cc2. 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/HKI191159105.
6 Gamle bygdevisur fra Lom (6 Old Village Songs from Lom), Op. 2 (version for violin and orchestra): No. 6. Moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0db15beada47be11c2aac477cab0b3285107048ecf6f952046c0cf098ddaf9ed. 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/HKI191159106.
Sparre Olsen: 3 Love Songs, Op. 36: No. 1, Canto amoroso
Pulling Out the Stops! Popular Pieces for Trumpet and Organ
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ec0216d6145b570689b4b24a0b83377857c55877f5841fad6d300f83427476a. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/GBAYC9202716.
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
6 Gamle bygdevisur fra Lom (6 Old Village Songs from Lom), Op. 2 (version for violin and orchestra): No. 3. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x655a129bea7b8179afbf26c3c452b008f6254eceb2560f5d35d93adf95ba5564. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/HKI191159103.
6 Gamle bygdevisur fra Lom (6 Old Village Songs from Lom), Op. 2 (version for violin and orchestra): No. 4. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb011a0bb6d460fb626d790cdba6dd4c2ca089c24fefe00963410672e3b390dc6. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKI191159104.