Kool may refer to: People Kool (surname), surname of Dutch origin Robert "Kool" Bell (born 1950), American bassist and founder of Kool and the Gang Roger Kool (1954–2005), Singaporean DJ (Roger Ki
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 0x6227ebb04e4631e15d12b394f8861d448de00a2d9464af310307ae0d21255e9b. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b72de47c-38ab-4569-98e5-6f96bb2cd4d9.json and https://artists.proofprofile.net/proofs/artist/b72de47c-38ab-4569-98e5-6f96bb2cd4d9.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).