EXPcalibur guide
What goes into one host-made receipt fingerprint. One receipt fingerprint: four ingredients in order One receipt fingerprint: four ingredients in order A binding identifies one accepted check for one run. HOST-OWNED INPUTS · JOIN THESE BYTES IN ORDER 1 · Fixed label 16 bytes 2 · Run owner 12-byte root 3 · Check kind 1 byte 4 · Checked data up to 128 bytes T A G _ C E R T o w n e r _ r o o t k i n d . a s _ u 8 ( ) c a n o n i c a l _ e v i d e n c e Join in order; ignore unused buffer space. SHA-256 Hash the joined message, then take its first 16 bytes. Saved binding A 16-byte fingerprint attached to this receipt. The host makes this after the work check passes. A guest-made hash is not an accepted receipt. The four input pieces are joined in this exact order. The host hashes them and keeps 16 bytes. This drawing shows the binding recipe, not a way for a bot to mint an accepted receipt.