Jo Foster (formerly Joe Foster, born 1999) is an English actor known for their roles on the West End stages. They are best known for originating the role of Oliver in the musical Why Am I So Single?
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 0x466d576421491017a78c9b91fe8aae89d5c95abd9cd1e0d51c927b48548cee3b. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1366a660-9c6f-4723-9fc5-4a3a0559eb7c.json and https://artists.proofprofile.net/proofs/artist/1366a660-9c6f-4723-9fc5-4a3a0559eb7c.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.