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.

Best Mnemonic Memory Messenger: Why Z-TEXT Never Forgets

23% of all mined Bitcoin is permanently lost — not to hackers, but to forgotten seed phrases. Z-TEXT's Eternal Memory restores everything from one 24-word seed. Test your own recall with the Mnemonic Memory Challenge.

Z-TEXT is a zk-SNARKs blockchain messenger. Nobody reads your messages but you. The hard part was never convincing people the blockchain remembers forever — it does, by design. The hard part is that the person holding the seed phrase doesn't always remember it back. This is what that gap actually costs, and what Z-TEXT does about it.

❓ Question 1

Why do people lose crypto forever, even though the blockchain never deletes anything?

Because the wallet was never the vulnerable part — the human holding the words to it was. A seed phrase isn't a password that gates access to funds stored somewhere else; it mathematically is the wallet. Every address a wallet has ever generated or will ever generate derives from that one phrase. There's no company database with a copy, no support line that can look one up, and no "forgot password" flow.

The scale is real: blockchain analytics firm Chainalysis estimates as much as 23% of all mined bitcoin — several million BTC — is permanently inaccessible, largely through forgotten phrases, destroyed backups, and deaths with no inheritance plan for the words. No hacker, no exploit — just a wallet nobody can open anymore.

The clearest single case: programmer Stefan Thomas received 7,002 BTC in 2011 for making an explainer video, worth about $2,000 at the time. He stored the private keys on a password-protected IronKey drive and lost the paper with the password. The device wipes itself after 10 wrong guesses; he has used eight. That bitcoin is now worth roughly $777 million — sitting untouched, not because of a hack, but because of a lost piece of paper.

Mini-resume: The blockchain doesn't forget — people do. Chainalysis estimates up to 23% of all mined bitcoin is permanently lost through forgotten keys, not theft. Stefan Thomas's 7,002 BTC ($777M) has sat locked since 2011 behind a password on paper he lost, with only two device-wipe attempts remaining.

❓ Question 2

What does "eternal memory" actually mean on Z-TEXT?

It means one seed phrase restores everything, not just the wallet. Z-TEXT combines a shielded messenger, a BTCZ wallet, on-chain Channels, and a blockchain password manager in a single app — and all of it is written to the BitcoinZ blockchain, not to a Z-TEXT server. Restore the 24-word seed on any device, and the app rescans the chain to rebuild the wallet, contacts, received messages, channels, and saved passwords.

Sent messages restore too, if "Keep sent messages on-chain" was turned on before sending. Messages in chats upgraded to post-quantum encryption stay on their original device by design — not even the seed brings those back, which is what preserves their forward secrecy.

Mini-resume: Z-TEXT's Eternal Memory means a single 24-word seed restores the wallet, messages, channels, and password vault — all settled on the BitcoinZ blockchain, with no central server involved. The only designed exception is post-quantum-upgraded chats, which stay local to protect forward secrecy.

❓ Question 3

What are the two ways Z-TEXT lets you back up that seed?

Both protect the exact same seed — it's a choice of storage method, not two different wallets.

Option A — Recovery phrase (24 words):

Write the words by hand, in order. The app quizzes a few word positions afterward to confirm they were captured correctly.

Option B — Encrypted backup file (.ztbk):

A portable file for USB or cloud storage, sealed with a second, separately-generated 24-word passphrase.

The file itself contains only the 24-word seed and a small timestamp — nothing else. It's locked with two layers of authenticated encryption, XChaCha20-Poly1305 wrapped around AES-256-GCM-SIV, with the encryption key derived from the backup passphrase using Argon2id. File alone, without the passphrase: an unreadable ~1MB blob. Passphrase alone, without the file: nothing to unlock. Both are required together.

Mini-resume: Z-TEXT offers two backup methods for the same seed — handwritten (Option A) or an encrypted .ztbk file locked by a second, app-generated 24-word passphrase (Option B). Both pieces of Option B are required to restore; either one alone is useless without the other.

❓ Question 4

Do you need to remember two 24-word phrases?

No. Only one is required — the wallet seed. The second phrase only exists if you choose the optional encrypted backup file instead of writing the seed on paper. Pick paper, and there's just the one phrase, the same as any other BIP-39 crypto wallet on the market.

It's also not possible to skip the first phrase entirely and deal only with the second. Every wallet displays the 24-word seed once during setup, and the app requires confirming a few requested word positions before moving on — that step happens no matter which backup method gets chosen afterward. What changes is what happens next: pick the encrypted file, and there's no need to write down or remember that seed again. The file holds it, locked behind the second passphrase — which becomes the only thing left to personally safeguard going forward.

Mini-resume: Only one phrase is mandatory — the wallet seed, shown once and confirmed during setup, regardless of backup method. The second passphrase is optional and only appears with the encrypted-file backup, trading long-term memorization of the seed for safeguarding one passphrase instead.

❓ Question 5

Why can't the backup-file passphrase just be a password you choose yourself?

Because most people would pick something guessable — a pet's name, a birthday, a favorite phrase. That kind of password gives a false sense of security on something guarding real funds. Z-TEXT auto-generates the backup passphrase from the same 2,048-word list used in the official BIP-39 standard, then derives the encryption key from it using Argon2id — a memory-hard function specified in RFC 9106, deliberately slow enough to resist brute-force and side-channel attacks. A full 24-word BIP-39 phrase carries roughly 256 bits of entropy; no password a person would choose and remember comes close.

Mini-resume: Z-TEXT never lets a user set their own backup passphrase, because human-chosen passwords are low-entropy and guessable. It auto-generates a 24-word, BIP-39-grade passphrase and runs it through Argon2id key derivation, making the backup file's protection exactly as strong as the wallet seed itself.

❓ Question 6

Is any backup method actually risk-free?

No — and Z-TEXT doesn't pretend otherwise. Paper can be lost, burned, or read by the wrong person. An encrypted file can be deleted, corrupted, or stranded in an account that's lost. Neither method removes risk; each just moves it somewhere different.

Hardware chip wallets take a different approach entirely: the seed is generated and sealed inside a physical chip and is never shown to the user as words at all, not even once. That removes human-memory risk completely, but trades it for pure physical risk — lose or damage both cards in a two-card set, or expose them to something like a strong magnetic field, and the funds can be gone with no words to fall back on anywhere.

Mini-resume: No backup method — paper phrase, encrypted file, or sealed hardware chip — is risk-free. Each trades one failure mode for another: memory risk, file-custody risk, or pure physical-loss risk. The real question is which risk a given person is best equipped to manage.

❓ Question 7

Can you test your own memory before real funds are on the line?

Yes — that's what the Mnemonic Memory Challenge is for. It's a safe, no-stakes practice round: pick Easy (6 words) or Elephant (12 words), study a picture-and-word pairing, then try to recall it from memory alone. Three context hints are available per word before an honest surrender option reveals the answer. The 4-letter autocomplete mirrors real BIP-39 wallet software directly — the official wordlist is designed so the first four letters of any word are enough to uniquely identify it.

Sample leaderboard (not live data): Captain Zero Trace 🫆, Snarky_, Shielded Ghost, zkPhantom, plus your own live score as "You."

Mini-resume: The Mnemonic Memory Challenge is a risk-free practice round for recalling a random word sequence, with hints, an honest surrender option, and BIP-39-accurate 4-letter autocomplete — built to surface memory gaps before they matter on a real wallet.

❓ Question 8

What's the real risk, in one sentence?

It was never the blockchain. Z-TEXT's wallet, messages, channels, and passwords all restore from one seed, permanently — the only open question the Mnemonic Memory Challenge answers is whether the person holding that seed would remember it back.

Mini-resume: The blockchain will never forget a seed phrase. The only variable left is human memory — which is exactly what practicing with the Mnemonic Memory Challenge is designed to test, before it's a real wallet on the line.

Sources:
BIP-39 spec (Bitcoin Improvement Proposals, GitHub) — https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki
RFC 9106 — Argon2 Memory-Hard Function (IETF/CFRG) — https://www.rfc-editor.org/rfc/rfc9106.html
Bitcoin.com News — "Seed Phrases: The 12 Words Standing Between You and Losing Everything" (Chainalysis stat) — https://news.bitcoin.com/learning-insights/bitcoin-seed-phrase-explained/
Gulf News — "Bitcoin: Meet Stefan Thomas who lost $777 million to a forgotten password"
Z-TEXT Docs — Backup & Recovery — https://z-text.com/docs/backup-recovery
Electric Coin Company — What are zk-SNARKs? — https://z.cash/learn/what-are-zk-snarks/

seed phrase memory · BIP-39 · encrypted backup file · blockchain password manager · zk-SNARKs messenger · BitcoinZ

🔗 Also read: 482 Bytes of Freedom · Blockchain Password Manager · Z-TEXT: Only Messenger With These 3 Things · Best No Phone No Metadata Messenger

⬇️ Download Z-TEXT

Z-TEXT · Mnemonic Memory Challenge

Can you remember it like an elephant?

Every crypto wallet is protected by a string of random words. Most people never test if they could actually recall theirs. This is a safe practice round — no real wallet, nothing saved, nothing at risk.

The point isn't just memory — it's precision. One misspelled word, or one word out of order, and a real wallet won't recover. This challenge shows you exactly how exact "exact" needs to be.

🐘

Step 1 of 4

Pick your round

12 words is the quick version. 24 words is what a real BitcoinZ wallet actually uses.

🟢 Easy — 6 words

Warm-up round · ~45 seconds

🐘 Elephant — 12 words

Full memory test · unlocks after Easy

Prototype note: a real wallet uses 12 or 24 words. This demo mirrors that scale so the challenge actually reflects it.

WORD 1 OF 4

🍎

apple

Picture this scene. Then tap next.

RECALL WORD 1 OF 4

🍎

Round Complete

Nice memory.

3/4

words recalled correctly

NO PHONE · NO EMAIL · NO SIM · ZERO METADATA

Sample Leaderboard

Can you beat them?

Practice scores only — nothing here is a real wallet.

NO PHONE · NO EMAIL · NO SIM · ZERO METADATA

Z-TEXT — zk-SNARKs Blockchain Messenger. No Phone. No Email. No SIM. Zero Metadata.

What is Z-TEXT?

Z-TEXT vs Signal vs Telegram vs WhatsApp