Calab Evans may refer to: Caleb Evans (geologist) (1831–1886), English geologist Caleb Evans (quarterback) (born 1998), gridiron football quarterback
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 0xd43e756e0b073f98ff7fbafb9df3dcf4c50d4f5a3d589cb70e3552c0c6a37adb. Chain 2 (Bitcoin): anchored in block 953949 (2026-06-16T13:28:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0d4b59c8-afd9-434b-8d70-7b95e5df968c.json and https://artists.proofprofile.net/proofs/artist/0d4b59c8-afd9-434b-8d70-7b95e5df968c.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).