Gijsbert (Bert) Bos (born 1963Gijsbert Bos, Rapid user interface development with the script language Gist , Dissertation, Groningen University, 1993) is a Dutch computer scientist known for the devel
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 0x18c6bc87480df0ad10e8845eaecd3fba339c3a0afa691e6844d29b645e5acd1e. Chain 2 (Bitcoin): anchored in block 954784 (2026-06-22T02:53:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e0ecbd0c-beeb-43fb-880d-47cae27da707.json and https://artists.proofprofile.net/proofs/artist/e0ecbd0c-beeb-43fb-880d-47cae27da707.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).