Solana SOL
A Solana account address is the 32-byte Ed25519 public key itself, base58 encoded (program derived addresses have no key). The key is therefore public from the moment an account is funded, and exposure is total by construction for keypair accounts.
Not live at protocol level. The Solana Foundation's quantum readiness post (27 April 2026) reports that Anza and Firedancer independently converged on Falcon and have initial implementations, with a three-step plan: keep evaluating Falcon and alternatives, adopt post-quantum schemes for new wallets if the threat becomes credible, then migrate existing wallets. An application-level option exists: Blueshift's Winternitz Vault, a hash-based one-time-signature program that has been live on Solana for over two years, lets users park SOL under a quantum-resistant key, but it is not a protocol account type.
Where the exposure number comes from
Solana Docs: Account Structure, as of 2026-09-17. By construction: every keypair account's address is its Ed25519 public key, so all SOL held by keypair accounts is exposed from first funding. Not adjusted for SOL held in program-owned accounts or Winternitz vaults; no measurement of those shares was found.
Treat 1.0 as the structural baseline. SOL in program derived addresses is controlled by program logic and ultimately by whichever keypairs the program trusts.
Sources
- Solana Docs: Account Structure accessed 2026-09-17
- Solana Foundation: Solana's Quantum Readiness accessed 2026-09-17
- CoinDesk: Solana developers outline plan to protect network from quantum threats (27 April 2026) accessed 2026-09-17
- Unchained: Solana Foundation Outlines Phased Quantum Readiness Plan accessed 2026-09-17