2K5 may refer to: the year 2005 the FAA location identifier for Telida Airport, American airport in Alaska the GRAU designation for the BM-25 Soviet multiple rocket launcher ESPN College Hoops 2K
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 0x94c467d8f8ab86bfe8cb6cf0b8651c0c3ba3fed351198e0546f44fa2f0851f92. Chain 2 (Bitcoin): anchored in block 954569 (2026-06-20T14:36:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b07b6c7f-b26b-4da7-a4a5-d22fb1d26734.json and https://artists.proofprofile.net/proofs/artist/b07b6c7f-b26b-4da7-a4a5-d22fb1d26734.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).