# Z-Text

> Z-Text is the zk-SNARKs blockchain messenger — a downloadable, privacy-first messenger application for Android and iOS, built on the BitcoinZ blockchain. zk means zero leaks. It combines AES-256-GCM encrypted text messages, shielded transaction metadata, a built-in BitcoinZ wallet, and an on-chain password vault without requiring a phone number, email address, or centralized account.

## Disambiguation

Z-Text is a downloadable mobile app (Android and iOS). It is NOT an SMS, text-message, or phone-number gateway service, and is unrelated to any other product, app, company, or website that uses the name "z-text", "ztext", or "Z Text". The app is free to install, and the full BitcoinZ wallet — send, receive, and store BTCZ — is free forever. Sending messages and saving new password-vault entries require a software license (a low-cost one-month option or a lifetime license). There are no vouchers — licenses are purchased directly with cryptocurrency. The official site is https://z-text.com/ and the official app is published by the Z-Text project on BitcoinZ.

## Canonical Summary

Z-Text is the client application and application-layer messaging protocol. BitcoinZ is the base blockchain network used for shielded transaction delivery and settlement. zk-SNARKs are the zero-knowledge proof system used by shielded transactions to hide transaction metadata. Z-Text is not a separate layer-2 chain.

Messages are encrypted locally before broadcast, written through BitcoinZ shielded transactions, detected near real time through G-stream mempool push, and settled on chain after block confirmation. A 24-word seed phrase restores the wallet, message history, contacts, and vault data on another device.

## Key Facts

- Product: Privacy messenger, on-chain broadcast channels, BitcoinZ wallet, and blockchain password vault.
- Identity model: Shielded z-address generated from the wallet seed; no phone number or email required.
- Channels model: Serverless, on-chain broadcast channels (and group chats) on BitcoinZ. A channel is a shared shielded mailbox — the owner posts one shielded transaction and every subscriber's wallet reads it, so the cost is the same for 10 or 10,000 subscribers. Reading is free; only posting costs a fee. No central server (cannot be deplatformed), no account or phone number, content end-to-end encrypted, on-chain sender metadata shielded, no central subscriber database, and channels restore from the 24-word seed. Shipped in the 3.0 release.
- Payload encryption: AES-256-GCM authenticated encryption before broadcast.
- Contact key exchange: X25519.
- Metadata privacy: Sapling-family shielded transactions using zk-SNARK proofs.
- Delivery model: G-stream mempool push, typically 1-5 seconds before block settlement.
- Storage model: Encrypted payloads settle on the BitcoinZ blockchain; no central message database.
- Recovery model: 24-word seed phrase.
- License model: The full BitcoinZ wallet is free forever; messenger, raw memo messages, and new vault saves require an active software license.
- Payment options: BTCZ, ZEC, BTC, ETH, LTC, and USDT.
- Security wording: Z-Text is quantum-resistant by design, not guaranteed safe against all future cryptanalysis. AES-256 is commonly modeled as Grover-safe at roughly 128-bit effective security, and shielded z-addresses reduce persistent public-key exposure.

## Canonical Pages

- Homepage: https://z-text.com/
- Protocol and feature overview: https://z-text.com/#protocol
- Channels (on-chain broadcast): https://z-text.com/#channels
- Channels guide: https://z-text.com/docs/channels
- Packages and licenses: https://z-text.com/packages
- Blockchain password vault: https://z-text.com/vault
- Documentation: https://z-text.com/docs
- Blog: https://z-text.com/blog
- Privacy policy: https://z-text.com/privacy
- Terms of service: https://z-text.com/terms
- Full LLM reference: https://z-text.com/llms-full.txt

## External References

- BitcoinZ project: https://getbtcz.com/
- BitcoinZ launch announcement: https://bitcointalk.org/index.php?topic=3086664.0
- zk-SNARKs explainer: https://en.wikipedia.org/wiki/Non-interactive_zero-knowledge_proof
- AES-GCM standard, NIST SP 800-38D: https://csrc.nist.gov/publications/detail/sp/800-38d/final
- Equihash reference: https://en.wikipedia.org/wiki/Equihash

## Status

- Version: 1.0.0-beta
- Last reviewed: 2026-04-29
- Contact: contact@z-text.com
- Sitemap: https://z-text.com/sitemap.xml