How We Fit a Messenger, Wallet, and Password Manager Into 482 Bytes — Z-TEXT

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A BitcoinZ shielded transaction gives you exactly 512 bytes of memo space. No more, no less — it's a consensus rule, not a setting anyone can adjust.<br>After the encryption envelope takes its cut — version byte, IV, auth tag, compression marker — 482 bytes remain.<br>That's the entire budget Z-TEXT had to fit a private messenger, a password manager, a BTCZ wallet, and broadcast channels into. No server anywhere holds any of it.<br>The message pipeline<br>Every Z-TEXT message goes through seven steps: packed with MessagePack, signed with Ed25519, optionally compressed, encrypted with AES-256-GCM, framed, versioned, then sent as one 512-byte memo on one BitcoinZ transaction.<br>One deliberate choice: signing happens before encryption. Sign-then-encrypt protects the signature inside the ciphertext. Do it the other way, and anyone holding the group's decryption key could strip the real sender's signature and forge their own.<br>Three bytes over the limit<br>On August 3, a real community invite payload hit 515 bytes, three bytes over the 512-byte consensus limit. It carried the room public key, invite token, role flags, display title, and room metadata. The sender submitted the transaction, the transaction published to the chain, but every client parsing the memo dropped it because the structural length validation failed. In crypto, silent drops are dangerous: fees are paid, transactions land on-chain, but the payload vanishes.<br>The fix was unglamorous. We pruned redundant room metadata fields, shortened the display title tag, re-signed the payload, and brought the total size down to 496 bytes. That left 16 bytes of safety margin. To keep this from happening again, CI now runs a regression test that measures actual MessagePack byte count on every single build.<br>Compression can make things bigger<br>Gzip-style compression adds roughly 23 bytes of overhead. On high-entropy data like signatures and keys — already unable to compress further — that overhead alone can push a payload over budget. Z-TEXT now checks both compressed and uncompressed size for every message and keeps whichever is smaller.<br>No server holds the moderation state<br>Bans, roles, pinned posts — none of it lives on a server. Every action is a signed instruction written into the same 512-byte memo space. Every client independently replays the full history and arrives at the same state. That's what makes Z-TEXT censorship-resistant by construction, not by promise.<br>Full breakdown, with infographic and video: z-text.org/482-bytes-of-freedom-2026<br>Sources: BitcoinZ · Zero-knowledge proofs, Wikipedia<br>Z-TEXT — zk-SNARKs blockchain messenger. No phone. No email. No SIM.

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