Jan Schreiber (born 1941) is an American poet, translator, and literary critic who has been part of the renascence of formal poetry that began in the late twentieth century. He is the author of five b
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 0xb71c36c29bd5d5008cf5a8a45c364e53c70f6ad67dd254d7b63e3c9253298029. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4bb3abaa-2c5c-48fd-868f-f9be68bcfe2a.json and https://artists.proofprofile.net/proofs/artist/4bb3abaa-2c5c-48fd-868f-f9be68bcfe2a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).