Stefan may refer to: Stefan (given name) Stefan (surname) Ștefan, a Romanian given name and a surname Štefan, a Slavic given name and surname Stefan (footballer) (born 1988), Brazilian footballe
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 0xbb449b4c44c70eedbc891add5e20681f38eaf42b765b95ed5df8012e5e36d7f3. Chain 2 (Bitcoin): anchored in block 954587 (2026-06-20T19:10:41Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc1795a1-89a6-4a41-9516-433d5da6e9d0.json and https://artists.proofprofile.net/proofs/artist/bc1795a1-89a6-4a41-9516-433d5da6e9d0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).