David Wallumrød (born 1977) is a Norwegian pianist, known from cooperations with artists such as Knut Reiersrud, Torun Eriksen, Jarle Bernhoft, Marit Larsen, Maria Solheim, Vidar Busk, Bigbang, Maria
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 0x2840629ccd7d4ed7f58c274b7bd319be413c7d5d08532d67bf27373729f93d09. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ed9298a6-6eee-463e-a19b-ba855e3fc2af.json and https://artists.proofprofile.net/proofs/artist/ed9298a6-6eee-463e-a19b-ba855e3fc2af.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).