bolt4

Onion routing protocol, per BOLT #4 (docs.ppad.tech/bolt4).
git clone git://git.ppad.tech/bolt4.git
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REVIEW-a3c7517.md (445B)

      1 # Review: IMPL4 Packet Processing (a3c7517)
      2 
      3 ## Status: Approved
      4 
      5 ## Issues
      6 
      7 None identified. Flow matches spec exactly.
      8 
      9 ## Notes
     10 
     11 - Version validation occurs first
     12 - HMAC verified before decryption (correct order per spec)
     13 - 2×1300 byte stream handles payload shift correctly
     14 - Final hop detection via all-zero next_hmac
     15 - Ephemeral key blinding for forwarding is correct
     16 - Shared secret returned for error attribution
     17 
     18 ## No blocking issues