Joseph Hartman (January 16, 1821 – November 29, 1859) was a farmer, teacher and political figure in Canada West. He was born in Whitchurch Township in Upper Canada in 1821, the son of Quakers who had
{"copyright_id":"0xaa45cbe5e3ed9d72c5cdbb1e50fd16ce439b2bdcaaeec2c6f71e13cc61e3ce2b","name":"Joseph Hartman","registered_at":"2026-06-17T08:48:06Z","symbol":"NIM1343032","token_address":"0x1ae476e89678cc228458bea276f6ba6a997f5e90","type":"artist","uuid":"7bf52ece-fa65-4ff3-b4ed-e24f7bbae706"}
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa45cbe5e3ed9d72c5cdbb1e50fd16ce439b2bdcaaeec2c6f71e13cc61e3ce2b. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7bf52ece-fa65-4ff3-b4ed-e24f7bbae706.json and https://artists.proofprofile.net/proofs/artist/7bf52ece-fa65-4ff3-b4ed-e24f7bbae706.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).