Ivan Reis (born 1976) is a Brazilian comics artist. He is known for his work on comic books such as Dark Horse Comics' Ghost, Marvel Comics' Captain Marvel and Avengers Icons: The Vision and DC Comics
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 0xf292c5e769d3e707c0a4c8516f793e124df9b4f26fe595339d170bb98c0e27b0. 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/f4f58212-64e9-4cb7-9176-8152548c4bbe.json and https://artists.proofprofile.net/proofs/artist/f4f58212-64e9-4cb7-9176-8152548c4bbe.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.