John Astor may refer to: John Jacob Astor (1763–1848), German-born American businessman John Jacob Astor III (1822–1890), grandson of the above, American financier and philanthropist John Jacob Astor
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 0x625c012ff082ea5a54392d5cb4835bd14db23d6ac853c241dbc84b027c51ef6d. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/525f1763-6252-4023-a9eb-153e9ec3e334.json and https://artists.proofprofile.net/proofs/artist/525f1763-6252-4023-a9eb-153e9ec3e334.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).