Kolja or Colja is a short form of the given name Nikolai. It may refer to: Kolja (film), Czech 1996 drama film Kolja Afriyie (born 1982), German former professional football player Kolja Blacher (
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 0x5140b7bf37c509f7dfb9b679f51bd796f288abd78adc2cc73d0c4fd17dbabf58. 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/639efd7e-b7ad-4ca0-8256-6d1985fd59b4.json and https://artists.proofprofile.net/proofs/artist/639efd7e-b7ad-4ca0-8256-6d1985fd59b4.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).