Kolbu KK is a Norwegian multi-sports club from Kolbu in Østre Toten Municipality. The club has sections for association football, team handball and Nordic skiing. The club was founded in 2020 as a me
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 0x7be5db4fc4d40570deca1c9ac0df464681091fac6c1709424f585059b4fd4a5d. Chain 2 (Bitcoin): anchored in block 954573 (2026-06-20T15:45:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b48d4081-3d8b-4fb8-822a-43ce0018b86e.json and https://artists.proofprofile.net/proofs/artist/b48d4081-3d8b-4fb8-822a-43ce0018b86e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).