Z-Text vs Signal vs Telegram: A Privacy Comparison

With growing awareness of digital privacy, users have more messaging options than ever. But not all privacy claims are equal. This article compares Z-Text's architecture with two popular alternatives: Signal and Telegram.

Architecture Overview

Signal

Signal uses the Signal Protocol for end-to-end encryption, routed through Signal's centralized servers. Messages are encrypted so Signal cannot read them, but the servers handle message routing, delivery, and key distribution.

Telegram

Telegram uses its custom MTProto encryption protocol. Regular chats are encrypted client-to-server only -- Telegram can read them. Only "Secret Chats" offer end-to-end encryption, and these are not available for groups or desktop.

Z-Text

Z-Text uses two-layer encryption with blockchain-based message delivery. There are no servers. Messages are shielded transactions on the BitcoinZ blockchain, protected by zk-SNARKs and an additional contact-key encryption layer.

Metadata Exposure

This is where the biggest differences emerge. Even with perfect encryption of message content, metadata -- who talks to whom, when, and how often -- can be extremely revealing.

• Signal: Collects minimal metadata (phone number required, sealed sender reduces metadata). However, Signal still knows when you're online and who your contacts are.
• Telegram: Collects extensive metadata including contacts, IP addresses, device info, and usage patterns.
• Z-Text: Collects zero metadata. Shielded transactions hide sender, recipient, and timing. No phone number required -- identity is a z-address.

Censorship Resistance

• Signal: Can be blocked by censoring Signal's servers or domain-fronting endpoints. Has been blocked in multiple countries.
• Telegram: Has been blocked in several countries. Relies on centralized infrastructure that can be targeted.
• Z-Text: Cannot be blocked without blocking the entire BitcoinZ blockchain network. No single domain or server to target.

Identity Requirements

• Signal: Requires a phone number, linking your messaging identity to a telecom-verified identity.
• Telegram: Requires a phone number. Recently added usernames but phone is still mandatory for registration.
• Z-Text: No phone number or email required. Your identity is a cryptographic z-address generated locally.

Trust Model

• Signal: Trust Signal Foundation to operate servers honestly, deliver correct keys, and not be compelled to add backdoors.
• Telegram: Trust Telegram to not read non-secret chats, operate infrastructure honestly, and resist government pressure.
• Z-Text: Trust only mathematics. The blockchain's security is maintained by distributed consensus, not any single organization.

Honest Tradeoffs

Z-Text's approach comes with real tradeoffs compared to centralized alternatives:

• Speed: Messages deliver in 1-5 seconds via mempool G-stream -- comparable to centralized apps, though block confirmation for permanent settlement takes longer
• Cost: Each message requires a small BTCZ transaction fee
• User base: Z-Text has a smaller community compared to mainstream apps
• Features: No voice calls, video, or large file sharing (memo field size limits apply)
• Onboarding: Wallet concepts may be unfamiliar to non-crypto users

Who Should Use Z-Text?

Z-Text is ideal for users who prioritize maximum privacy and censorship resistance above all else. It's particularly suited for:

• Journalists and sources communicating in sensitive contexts
• Users in regions where communication is censored or surveilled
• Privacy advocates who want zero-metadata messaging
• Anyone who wants their communication infrastructure to be unstoppable

For casual everyday messaging where speed and features matter more than maximum privacy, Signal remains an excellent choice. For users who need the absolute strongest privacy guarantees available today, Z-Text offers something no centralized app can match.