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.

Postcard from 2035

Postcard From 2035 #2: No One Asks for Your Phone Number

A postcard from 2035: you gave your phone number to every app, then 533 million of them leaked. Why a leaked number follows you for years, and how Z-TEXT works with no phone, no email and no SIM.

Postcard from 2035 · #2. A joke on the front, a real fact on the back.

Postcard #2 just arrived from 2035. Again a joke on the front, and a real fact on the back.

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

In short

In April 2021, the phone numbers of 533 million Facebook users from 106 countries were posted on a hacking forum. A leaked phone number is hard to change, and it links your name, your accounts and your login codes. Z-TEXT replaces the phone number with a 24-word seed phrase: no phone, no email, no SIM.

❓ 1. What does postcard #2 say?

"Dear 2026, you gave your phone number to every app. Then 533 million of them leaked. In 2035, nobody asks for one. Our ID is 24 words."

The year 2035 is invented. The leak is real.

❓ 2. What was the leak?

In April 2021, the phone numbers and profile details of 533 million Facebook users were posted on a hacking forum. The data covered 106 countries, including about 32 million users in the US and 11 million in the UK. (Source: The Record)

Attackers had collected the data in 2019, through a bug in Facebook's contact-import feature. They fed in phone numbers and got back the matching profiles. Facebook fixed the bug in August 2019. (Source: The Hacker News)

And Facebook said it had no plans to notify the users one by one. (Source: NPR)

Mini-resume

In April 2021, the phone numbers of 533 million Facebook users in 106 countries appeared on a hacking forum. Attackers had scraped them in 2019 through a bug in Facebook's contact-import feature, fixed in August 2019. Facebook did not notify users individually.

❓ 3. Why does a leaked phone number matter?

You can change a password in one minute. Changing your phone number is a lot harder.

That one number links your name, your accounts and the login codes many sites send by text message. A security expert quoted by NPR called it a "universal identifier." (Source: NPR)

So a leak doesn't end. It follows you.

Our view: a phone number was never a good ID. It was just the easiest one for apps to collect.

Mini-resume

A leaked phone number is hard to change. The same number links a person's name, accounts and text-message login codes, which is why security experts call it a universal identifier. A phone-number leak keeps exposing people for years.

❓ 4. How does Z-TEXT work without a phone number?

In Z-TEXT, your identity is 24 words, called a seed phrase. A seed phrase is a list of words that creates your keys on your own device.

Z-TEXT asks for no phone, no email and no SIM. So there is no phone number to leak from Z-TEXT in the first place.

Z-TEXT also lets you create separate disposable identities. Each Z-TEXT identity is its own 24-word seed.

Yes, we sell a messenger, so of course we'd say this. But you can check it yourself: the Z-TEXT setup screen never asks for a number.

Mini-resume

Z-TEXT replaces the phone number with a 24-word seed phrase created on the user's device. Z-TEXT asks for no phone number, no email and no SIM, and each disposable Z-TEXT identity has its own seed.

Honest note: the Z-TEXT app has not been independently audited yet. A public bug bounty is open.

This is card #2 of the series Postcard from 2035. Card #1 was about quantum computers: Postcard From 2035: Your Chats Got Opened. Ours Are OK.

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

Sources

Keywords: no phone number messaging app · private messaging app · anonymous messaging app · blockchain messenger · secure messaging app · zero-knowledge proof messenger · Signal alternative · Telegram alternative

🔗 Also read: Signal vs Z-TEXT · WhatsApp vs Z-TEXT · Session vs Z-TEXT · Telegram vs Z-TEXT · Four Apps Replaced · The Third Man