Foster may refer to: People Foster (surname) Foster Brooks (1912–2001), American actor Foster Moreau (born 1997), American football player Foster Sarell (born 1998), American football player Joh
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 0x41f20d641502bd1f35de92f2d4a4a5fa5910c900d2fec9d68903acc9a9abf3f7. Chain 2 (Bitcoin): anchored in block 954650 (2026-06-21T04:51:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d9e55846-7397-4986-a4df-1bb83fdbaf1a.json and https://artists.proofprofile.net/proofs/artist/d9e55846-7397-4986-a4df-1bb83fdbaf1a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).