Finn Ludt (16 November 1918 – 3 August 1992) was a Norwegian pianist, composer and music critic. He was born in Fana. He made his concert debut in Bergen in 1945. He composed several songs, including
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 0x84f3bdfcfa71e27f2d57f742841b51092cb7f3760f2e95cb7a2d28046e569564. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23c60e2b-98cb-4ff2-98f2-89a64291685d.json and https://artists.proofprofile.net/proofs/artist/23c60e2b-98cb-4ff2-98f2-89a64291685d.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Walkabout - New Music for Concert Band - Demo Tracks 2015-2016
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 0xb021de5f554909e9d1046688e779fdff7a904ecd8ac64852a68dd1b20b048df0. Chain 2 (Bitcoin): anchored in block 960383 (2026-07-31T09:50:37Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NODGN1502030 — a six-check JSON result.
Fra Norske Musikkspill (Norwegian Musical Medley)
Tognum Power - New Music for Concert Band - Demo Tracks 2016-2017
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f4ad73c70a3526e0998d8290cf32f1e753f9c9818216b6f680a6f55fd1ef645. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NODGN1606120 — a six-check JSON result.
Og Teksten Var Av Prøysen - Norwegian Evergreens (Cb4)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d9cacc1d7140ebde6a42997dfa79351ba74f58c81606bfb4f57f3b6082acff3. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/NOX9X3351808 — a six-check JSON result.