Z-TEXT, a privacy-focused messenger built on the BitcoinZ blockchain, is now publicly available for download. The application requires no phone number, no email address, no SIM card, and no KYC verification. Instead, user identities are generated from a seed phrase and can be discarded and replaced at any time. Zero-knowledge proofs conceal who is messaging whom, while every message is stored on a blockchain that grants permanence rather than imposing a forced expiration date.

That no-phone-number design is a notable departure from mainstream messaging platforms, which typically bind accounts to a phone number — an identifier that doubles as a real-world identity link and, in so-called SIM-swap attacks, has been hijacked by attackers who persuade carriers to transfer a victim’s number to a device they control. Seed-phrase identities leave no carrier-issued handle target.

Eric Pierrot, founder of Z-TEXT, framed the project in terms of protection for vulnerable speakers: “I believe in zk-SNARKs the way some people believe in free speech itself. A whistleblower, a journalist, anyone who needs to speak without being silenced shouldn’t have to trust a company. The math should protect them, not a privacy policy.”

Every message sent through Z-TEXT is shielded with zk-SNARKs — short for zero-knowledge succinct non-interactive arguments of knowledge — a proof system that enables the blockchain to confirm a message is valid without revealing the sender, the recipient, or the content. Message content is encrypted on the sender’s device before it ever leaves, and Z-TEXT does not hold the keys required to read it.

Most mainstream messaging applications treat deletion as a safety feature, yet deleted files frequently persist on disk or on remote servers. Z-TEXT’s message layer instead runs on a decentralized blockchain and does not rely on any single company-owned message server. The company characterizes this design as “shielded permanence”: private enough that no one can read a message, and permanent enough that no one can erase it.

Z-TEXT combines five functions on a single blockchain: a messenger, a BTCZ wallet, an on-chain password manager, a broadcast feature called Channels, and a disposable identity system. Each identity is anchored to its own 24-word seed phrase, and that single seed unlocks all five functions without requiring a separate account for any of them.

The messenger is built on three layers of cryptography:

• The BitcoinZ blockchain, for decentralization and permanence
• zk-SNARKs, for privacy
• Post-quantum cryptography (ML-KEM-768, the key-encapsulation scheme standardized by the U.S. National Institute of Standards and Technology as FIPS 203 in 2024, live since version 3.7.0), which protects the encryption handshake against future quantum computers

Each message costs approximately 0.0002 BTCZ, comprising a small network fee plus 0.0001 BTCZ delivered to the recipient. That recipient amount is returned when the recipient replies, so in a normal back-and-forth conversation the effective cost is about 0.0001 BTCZ per message.

The underlying BitcoinZ network mined its first block in September 2017 and uses GPU-friendly mining rather than requiring the specialized ASIC hardware that dominates Bitcoin mining. An independent security review of the BitcoinZ full node, published in June 2026, found no way to counterfeit or inflate the coin supply.

Z-TEXT does not issue BTCZ or control the BitcoinZ blockchain. The company operates without venture capital funding and runs an active bug bounty program, now extended beyond launch. Bounties are paid in ZEC from a public pool that anyone can verify on-chain, and one payout has been issued to date.

Z-TEXT is available now for Android, macOS, Windows, and Linux at z-text.com, with an iOS release coming to the App Store — the next availability milestone to watch, since App Store distribution routes the app through Apple’s review process. Wallet functions and reading previously saved data are free and require no license. A license unlocking messaging, the password manager, Channels, and identity creation starts at three dollars for one month, payable in several major cryptocurrencies.