SSI: Cross-Chain Instruction Execution for Solana

SSI (Solana Signed Instruction) enables secure cross-chain instruction execution on Solana and gasless transaction relaying. SSI is a lightweight protocol requiring only 129 bytes of data.

Example Use Cases

• Execute Solana program instructions from Ethereum smart contracts
• Gasless transaction relaying on Solana
• Execute Solana program instructions without needing to hold SOL

Universal Compatibility

Any wallet capable of secp256k1 signatures can be used with SSI, with out of the box support for any EVM blockchain.

Reference Implementation

ByteSignedIx is a reference implementation of the SSI specification. An example program using SSI for user authentication is located in proxy_auth.