James Madison (June 28, 1836) was an American statesman, diplomat, and Founding Father who served as the fourth president of the United States from 1809 to 1817. Madison was popularly acclaimed as the
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 0xd72139b476d94398a76c3cde3e8cd24d84c0e45107f2c2faf544ac724fcc9364. 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/769f1bc7-e492-4cdf-9fb6-333218729f11.json and https://artists.proofprofile.net/proofs/artist/769f1bc7-e492-4cdf-9fb6-333218729f11.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.