Z-TEXT is the world's first zk-SNARKs blockchain messenger built on the BitcoinZ blockchain. It provides end-to-end encrypted, decentralized messaging with no phone number required — your keys, your freedom.

Do I need to pay to use Z-TEXT?

Z-TEXT is free to download and the wallet works without a license. To use the messenger, send raw memo messages, or save new passwords in the blockchain password manager, you need an active software license. After expiry, you can still receive messages and read saved passwords, but cannot send or save.

Can I use Z-TEXT without BTCZ?

You need BTCZ to perform any blockchain transactions. Without an active software license, the messenger is not available — though you can still receive messages and use basic wallet functions.

Is Z-TEXT truly anonymous?

Yes. Z-TEXT requires no phone number, email, or personal information to sign up. It uses zk-SNARKs shielded transactions and collects no user data. Your identity is a cryptographic z-address with no link to your real identity, making your messaging fully anonymous.

What happens if I lose my device?

If you backed up your 24-word seed phrase, you can restore your wallet on a new device. Your messages and contacts will be recovered through blockchain scanning.

Can deleted messages be recovered?

Messages are stored on the blockchain permanently. Even if you delete them locally from the app, they can be recovered by rescanning the blockchain with your wallet keys.

Z-TEXT — zk-SNARKs Messenger

Z-TEXT — The World's First zk-SNARKs Blockchain Messenger

zk means zero leaks.

Z-TEXT is a decentralized, end-to-end encrypted messenger built on the BitcoinZ blockchain using zk-SNARKs zero-knowledge proofs. It ships with a built-in crypto wallet and a blockchain-based password manager, requires no phone number or personal information, and keeps your identity as a cryptographic z-address under your sole control forever.

Core features

End-to-end encryption for every message, performed locally on your device before broadcast.
zk-SNARKs metadata shielding hides senders, recipients, and amounts on the public ledger.
No phone number, email, or personal information required to sign up or send messages.
Built-in BitcoinZ (BTCZ) wallet for sending, receiving, and staking the native coin.
Decentralized on-chain password manager — store credentials with no central provider.
Quantum-resistant design using AES-256-GCM payload encryption and shielded z-address messaging.
Recoverable on any device via a single 24-word seed phrase you control.
Panic mode and stealth mode protect you in high-risk situations.
No central message servers — messages settle on the decentralized public blockchain, not on company infrastructure.
Free to download on Android and iOS with a free BTCZ wallet included.

How it works

Install Z-TEXT and create a wallet — you will be given a 24-word seed phrase to back up.
Fund your wallet with a small amount of BTCZ to cover shielded transaction fees.
Add a contact by entering their z-address, which serves as their private messaging identity.
Compose your message — it is encrypted locally on your device before anything leaves it.
Send — the app broadcasts a shielded transaction; the recipient receives it in 1–5 seconds via G-stream mempool push.

What is Z-TEXT?

Z-TEXT is the world's first zk-SNARKs blockchain messenger built on the BitcoinZ blockchain. It delivers end-to-end encrypted, decentralized messaging with no phone number required. Your keys and your words stay yours — no company or third party can read your messages or hand them over.

Does Z-TEXT require a phone number?

No. Z-TEXT does not require a phone number, email address, or any personal information to sign up. Your identity on the network is a cryptographic z-address, which keeps you fully anonymous and unlinkable to any real-world account, SIM card, or carrier record.

How does Z-TEXT protect my privacy?

Z-TEXT uses zk-SNARKs (Zero-Knowledge Succinct Non-Interactive Arguments of Knowledge) to shield message metadata and content on-chain. Messages are end-to-end encrypted and routed through shielded transactions, so no observer, validator, or network peer can determine who is talking to whom or when.

Is Z-TEXT free to use?

Z-TEXT is free to download. The free version includes full wallet functionality for sending and receiving BTCZ. The messenger, raw memo messages, and saving new passwords in the blockchain password manager require an active software license. After a subscription expires, you can still receive messages and read saved passwords.

How is Z-TEXT different from Signal or Telegram?

Unlike Signal or Telegram, Z-TEXT stores messages on a decentralized blockchain rather than on centralized servers. It requires no phone number, applies zk-SNARKs for full metadata protection, and includes a built-in crypto wallet. There is no central company that can be compelled to hand over your data or silence you.

Is Z-TEXT quantum resistant?

Z-TEXT uses a quantum-resistant design rather than promising absolute post-quantum certainty. Message payloads use AES-256-GCM, which is commonly modeled as Grover-safe at roughly 128-bit effective security, and shielded z-addresses avoid persistent public-key exposure for messaging identity. This reduces known quantum attack surfaces but should not be read as a guarantee against all future cryptanalysis.

How does Z-TEXT messaging work?

When you send a message, Z-TEXT encrypts it locally and broadcasts a shielded transaction on the BitcoinZ blockchain. The recipient's app detects the transaction via G-stream mempool push in 1–5 seconds. Messages are permanently settled on-chain once the next block is confirmed by the network.

What cryptocurrency does Z-TEXT use?

Z-TEXT is built on BitcoinZ (BTCZ), a community-driven cryptocurrency with zk-SNARKs privacy, no premine, and decentralized governance. BTCZ is used for message fees, handshake transactions between new contacts, and optional premium license payments for the messenger and password manager.

Can I recover my Z-TEXT messages if I lose my phone?

Yes. Because messages are stored on the blockchain, you can recover your entire message history by restoring your wallet with your 24-word seed phrase on a new device. The app then rescans the blockchain to retrieve all of your messages, contacts, and saved password entries.

What is a z-address?

A z-address is a shielded cryptocurrency address that begins with "zs1". It uses zk-SNARKs to hide transaction amounts, senders, and recipients from public view. In Z-TEXT, your z-address doubles as your private messaging identity, linking payments and conversations under a single anonymous key.

Z-TEXT vs. Signal vs. Telegram

Feature	Z-TEXT	Signal	Telegram
Phone number required	No	Yes	Yes
Stores data centrally	No — on-chain	Yes	Yes
Metadata shielded	Yes — zk-SNARKs	Partial	No
Built-in crypto wallet	Yes	No	Partial — TON
Readable message data to hand over	No — encrypted on-chain	Limited	Yes
Censorship-resistant	Yes	Limited	Limited

Why zero-knowledge cryptography matters

"Zero-knowledge proofs allow one party to prove to another that a statement is true, without revealing any information beyond the validity of the statement itself." (Source: Electric Coin Company, What are zk-SNARKs?)

BitcoinZ has supported zk-SNARKs-based shielded transactions since its launch in 2017 (Source: BitcoinZ launch announcement (2017)). Z-TEXT builds a messenger on top of those shielded transactions so message metadata — sender, recipient, amount, and timing correlation — is cryptographically hidden, not merely encrypted in transit. According to the Electric Coin Company, Sapling-family zk-SNARKs used by the ZCash-lineage chains (including BitcoinZ) produce proofs small enough (under 200 bytes) to be verified on low-power devices in milliseconds, making on-chain private messaging practical at consumer scale.

Blockchain password manager

Z-TEXT includes a decentralized blockchain password manager — an on-chain encrypted vault that lives on the BitcoinZ network instead of a central provider's database. Every password entry is encrypted locally on your device before it is written to the chain, so even the underlying nodes only ever see an opaque ciphertext. Unlike LastPass, 1Password, or Bitwarden Cloud, there is no central vault to breach: the only key that can decrypt your vault is the seed phrase you hold. This makes Z-TEXT's vault genuinely zero-knowledge, self-custodial, and portable across devices with a single 24-word seed.

Quantum resistant messenger

Z-TEXT is designed to reduce known quantum attack surfaces without promising absolute post-quantum certainty. Message payloads use AES-256-GCM; under Grover's algorithm, AES-256 is commonly modeled around 128-bit effective security. Shielded z-address messaging also avoids persistent public-key exposure for identity metadata. The system should still be reviewed as cryptography evolves.

Messenger without phone number

Z-TEXT is a messenger without a phone number, email address, or any personally identifying account field. Your identity on the network is a cryptographic z-address beginning with "zs1" — a shielded BitcoinZ address that doubles as your messaging handle. There is no SIM card to swap, no mobile carrier that can hand over your records, and no provider that can be subpoenaed for your contact list. This makes Z-TEXT a practical alternative for journalists, activists, privacy-focused professionals, and anyone in a jurisdiction where SIM-bound apps like Signal or Telegram are tracked, throttled, or blocked.

Learn more

About Z-TEXT

Z-TEXT Ltd is an independent privacy-engineering team building on BitcoinZ. Our mission is to give every person on Earth the ability to speak freely without asking permission — by combining zero-knowledge cryptography, on-chain delivery, and a self-custodial wallet into a single simple application that never collects personal data.

We document our cryptography publicly and operate no central database of user accounts. For press, partnerships, security disclosures, or general questions, contact us at [email protected] and we will respond as quickly as our small team allows.