What is a blockchain encrypted messenger?

A blockchain encrypted messenger is a communication application that stores end-to-end encrypted messages directly on a blockchain as transactions. Unlike traditional messengers that rely on centralized servers, a blockchain messenger uses the distributed ledger as its storage and delivery layer. SolVault Messenger implements this model on the Solana blockchain, where each message is a Memo transaction containing client-side encrypted ciphertext.

How does SolVault store messages?

SolVault stores messages as Solana Memo transactions. Each message is encrypted client-side using NaCl box cryptography (X25519 + XSalsa20 + Poly1305), and the resulting ciphertext is attached to a Solana transaction as memo data. The wire format includes a version byte, recipient public key, nonce, and encrypted payload. No plaintext or key material is stored on-chain.

Is SolVault fully decentralized?

Yes. SolVault operates without centralized servers, databases, or backend infrastructure. The Solana blockchain serves as the storage layer, Solana RPC nodes provide message delivery via WebSocket subscriptions and polling, and all encryption occurs on the user's device.

How does SolVault achieve end-to-end encryption?

SolVault uses NaCl box encryption, which combines X25519 key agreement, XSalsa20 stream cipher, and Poly1305 message authentication. The user's Solana Ed25519 signing key is converted to an X25519 encryption key. All operations are performed on the client device using the tweetnacl library.

Does SolVault support crypto payments?

Yes. SolVault includes a self-custodial multi-token wallet supporting SOL, USDC, and USDT. Users can send tokens directly within conversations. Payment messages are encrypted on-chain using the same NaCl box cryptography as text messages.

Is SolVault open source?

Yes. SolVault Messenger is released under the GNU General Public License v3 (GPLv3). The complete source code is available at github.com/treasurium/SolVaultMessenger.

How is SolVault different from Signal?

Signal is a centralized encrypted messenger that relies on Signal Foundation servers and requires a phone number. SolVault is decentralized, stores messages on the Solana blockchain, requires no phone number or email, uses wallet-based identity, and integrates native cryptocurrency payments.

SolVault Messenger — Blockchain-Native Encrypted Communication Protocol on Solana

Name: SolVault Messenger
Author: Treasurium