Z-TEXT is a zk-SNARKs blockchain messenger. Z-TEXT requires no phone number, no email, and no SIM. Z-TEXT collects zero metadata. Z-TEXT combines a shielded messenger, a password manager, and a crypto wallet in one app. Z-TEXT is built on the BitcoinZ blockchain since September 10, 2017.

What is the best messaging app with no phone number?

Z-TEXT is a leading messaging app with no phone number. Your identity is a cryptographic z-address on the BitcoinZ blockchain. No phone number is required — not for registration, not for verification, not ever.

How much does Z-TEXT cost?

The Z-TEXT Cyberpunk Lifetime License costs $128.52 one time. No subscription. 1 million possible messages are included and the license never expires. Payment accepted in BTCZ, ZEC, BTC, ETH, USDT and more. There is also a Zero Trace 1-month plan at $3.00.

Is Z-TEXT quantum resistant?

Yes. Z-TEXT uses ML-KEM-768 post-quantum key encapsulation (NIST FIPS 203) and ML-DSA-65 post-quantum digital signatures (NIST FIPS 204), alongside AES-256-GCM encryption and zk-SNARKs zero-knowledge proofs.

What is panic mode in Z-TEXT?

Panic mode in Z-TEXT uses a second PIN called the Panic PIN. If you enter the Panic PIN instead of your real PIN, the app wipes itself instantly. Your real data stays safe on the blockchain and is fully recoverable with your 24-word seed phrase on any clean device.

What is stealth mode in Z-TEXT?

Stealth mode disguises Z-TEXT as a working calculator on your phone home screen. You open the calculator and type a secret code as a math equation to unlock the app. To anyone inspecting your device — at a border crossing, under coercion, or during a casual check — it looks like an ordinary calculator.

What happens if I lose my phone?

Enter your 24-word seed phrase on any new device. Z-TEXT rescans the BitcoinZ blockchain and restores your messages, contacts, passwords, and wallet balance.

What does the blockchain reveal about a Z-TEXT message?

Very little. A blockchain explorer shows a transaction ID, a block height, and confirmations. No sender, no receiver, no message content, and no identity are exposed.

How does Z-TEXT compare to Signal?

Z-TEXT requires no phone number. Signal requires a phone number. Z-TEXT has no phone numbers to hand over. Z-TEXT is post-quantum protected.

zk-SNARKs stands for Zero-Knowledge Succinct Non-Interactive Arguments of Knowledge. It is a cryptographic method that proves a transaction happened without revealing who sent it, who received it, or what it contained. Z-TEXT uses zk-SNARKs to shield every message on the BitcoinZ blockchain.

Is Z-TEXT safe for journalists?

Yes. Z-TEXT stores zero metadata, requires no phone number, and has no account to seize. Panic mode wipes the app instantly if a device is taken. Stealth mode hides the app as a calculator. Journalists and their sources are protected at every layer.

Why does harvest now, decrypt later matter more for a blockchain messenger?

Z-TEXT stores messages on the BitcoinZ blockchain, which is permanent: anyone can keep a copy forever. A blockchain messenger must therefore plan for future attackers from day one.

What part of Z-TEXT is not quantum-resistant yet?

Message signatures still use classical Ed25519. The BitcoinZ shielded layer (Sapling), the wallet, Channels and Communities are not quantum-resistant yet. The Z-TEXT app has not been independently audited; a public bug bounty is open.

What is the Message from 2035 series?

Message from 2035 is a series of 10 postcards from Z-TEXT. A time traveler from 2035 jokes about 2026, and each card hides one true fact about privacy and Z-TEXT.

Message from 2035, Quantum, Privacy, zk-SNARKs, Z-TEXT

Postcard From 2035: Your Chats Got Opened. Ours Are OK.

A postcard from 2035: someone copied your encrypted chats in 2026, waited, and opened them with a quantum computer. Here is what "harvest now, decrypt later" means, and how Z-TEXT protects a chat today.

Message from 2035 · #1. A joke on the front, a real fact on the back

A postcard just arrived from 2035. It's a joke. The warning inside is not.

Z-TEXT is a privacy messenger built on the BitcoinZ blockchain. It needs no phone number, no email and no SIM. Your identity is 24 words.

This is the first card of a new series: Message from 2035. A time traveler looks back at 2026, and laughs. Every card hides one true fact.

Card #1 is about quantum computers.

Vintage postcard from 2035 to 2026 with a Z-TEXT bird stamp and a "Quantum-resistant" postmark. Message: your encrypted chats were copied, waited, and opened by a quantum attack in 2035; Z-TEXT chats are OK. — Message from 2035 · #1. A joke on the front, a real fact on the back.

❓ What does the postcard say?

"Dear 2026, your encrypted chats? Someone copied them. Waited. In 2035, a quantum attack opened them. Ours are OK."

The year 2035 is invented. The method is real.

❓ What is "harvest now, decrypt later"?

"Harvest now, decrypt later" means collecting encrypted data today and storing it until a future technology can break it. (Source: Wikipedia)

A quantum computer is a new kind of computer. A large one could break the public-key math that protects most encrypted chats today.

The attacker doesn't need that computer now. The attacker only needs to keep a copy and wait.

Europol warned about this on 7 October 2026. We explained it here: Europol's Quantum Warning: What It Means for Messaging.

❓ Why does it matter more on a blockchain?

Z-TEXT stores messages on the BitcoinZ blockchain. A blockchain is permanent: anyone can keep a copy, forever.

So a blockchain messenger must plan for the future attacker from day one. Permanence and quantum resistance go together.

❓ How does Z-TEXT protect a chat today?

Every Z-TEXT one-to-one chat starts with a hybrid key exchange: ML-KEM-768 together with classical X25519. Live since version 3.7.0.

ML-KEM-768 is a quantum-resistant key exchange standardized by NIST in August 2024 as FIPS 203. (Source: NIST FIPS 203)

The message itself is encrypted with AES-256-GCM. On the blockchain, zk-SNARKs hide the sender, the receiver and the amount.

A copy taken today stays locked, even for an attacker who waits.

❓ What is not quantum-resistant yet?

Honest answer, so the postcard stays fair:

Z-TEXT part	Quantum-resistant today?
One-to-one chat key exchange	Yes: ML-KEM-768 + X25519
Message signatures	Not yet: classical Ed25519
BitcoinZ shielded layer (Sapling)	Not yet: depends on the BitcoinZ network
Wallet, Channels, Communities	Not yet

The Z-TEXT app has not been independently audited yet. A public bug bounty is open.

❓ What is "Message from 2035"?

A series of 10 postcards. One per day. A time traveler laughs at 2026: phone numbers, deleted accounts, open servers.

Each card is a joke on the front and a fact on the back. Next card: why nobody asks for your phone number in 2035.

Z-TEXT runs on Android, macOS, Windows and Linux: z-text.com/downloads. BitcoinZ lives at getbtcz.com.

Sources

Keywords: quantum-resistant messaging app · private messaging app · blockchain messenger · zero-knowledge proof messenger · no phone number messaging app · harvest now decrypt later · ML-KEM-768 · Signal alternative

👉 No Phone. No Email. No SIM.
Zero Metadata. Just Z-TEXT.