Martin Sjølie (born 25 April 1979 in Bærum) is a Norwegian songwriter and record producer, most known for his work with artists Sigrid, Maria Mena and Dotan. Although he is based at his own Studio in
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 0xa84fb4012939a6ac28508920e63ecddb81f5c88f610357b15104b283349a2757. 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/6ab01486-9fc2-4e74-a60a-b25875093d66.json and https://artists.proofprofile.net/proofs/artist/6ab01486-9fc2-4e74-a60a-b25875093d66.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Home for Christmas - Vocal or Instrumental Solo
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 0x8a4674a19063540abc68b5a52cbb479d268c5f6825f9a8b686367f53ca48455f. 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/NODGN1502360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46680284c48813ba1b5116526cd761c5c540569834b1406eafa8c7ad27fa5fa7. 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/UKUZW2000575.
Tognum Power - New Music for Concert Band - Demo Tracks 2016-2017
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x053d5a825981dc5b6a5c04380ef5c5039cf8cf7a05c7476fc7a8dfb7e50c6d81. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/NODGN1606330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc00812c6d1dd6c5f5704dc73002a4bd42f0aaf930f733d013e4ae1b2ec7f2308. 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/UKUZW2002321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7259395825f49029382bd7d28c349dca042ddbd783ddd088636b6a451c3cb898. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QMFME2108517.