Jordan Anderson or Jourdon Anderson (December 1825 – April 15, 1905) was an African-American former slave noted for an 1865 letter he dictated, later titled by publishers as "Letter from a Freedman to
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 0x64a96a25da232c99f4fee467ad8281c7ffed8796c60cb7bc6af64511789c5c04. Chain 2 (Bitcoin): anchored in block 953991 (2026-06-16T18:47:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2ec27630-73c4-4dc7-bb1c-b680abd3c639.json and https://artists.proofprofile.net/proofs/artist/2ec27630-73c4-4dc7-bb1c-b680abd3c639.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).