Alexander Stanley Kroll (November 23, 1937 – December 17, 2024) was an American professional football player and an advertising agency executive at Young & Rubicam, where he was CEO for ten years. Ea
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 0xbdfc6400eb7e9b6437538970723edf24ebd10c45defabe3e7c1da0d27cc2fcb4. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/de6c7d1d-c5f6-45cd-bd51-97d6ee0e7355.json and https://artists.proofprofile.net/proofs/artist/de6c7d1d-c5f6-45cd-bd51-97d6ee0e7355.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).