What is a BIP-39 seed phrase?

Instead of a username and password on a server, a seed phrase deterministically generates your keypair on your own device. Whoever holds the phrase controls the account; nobody else ever has it.

PrivaMesh accounts are BIP-39 seed phrases mapping to a self-custodial Solana keypair, stored in the iOS Keychain. This is what makes it an encrypted messenger with no phone number - the account is math you generate, not an identity you hand over. The responsibility: write your seed down and keep it safe, because there is no password reset.

BIP-39 is a Bitcoin Improvement Proposal that standardised turning entropy into a memorable word list. The words come from a fixed 2048-word dictionary chosen so no two entries share their first four letters, which makes the phrase resistant to typos and easy to check. A checksum is built into the final word, so a mistyped phrase is usually rejected rather than silently deriving the wrong account.

Twelve words encode 128 bits of entropy and twenty-four encode 256. The security is in the randomness, not the words themselves - which is why a phrase you invent yourself is dramatically weaker than one a device generates, and why phrases must never be photographed, typed into a website, or stored in a notes app that syncs.

In PrivaMesh the seed derives a Solana keypair that is simultaneously your messaging identity and your wallet. That is convenient and it concentrates risk: whoever holds the phrase holds both. Write it down on paper, store it somewhere physically safe, and treat it as the single thing that matters.