sRFC 00019: Wallet Standard - Get Ephemeral Signers feature

Wallet Standard - Get Ephemeral Signers feature

Summary

Ephemeral Signers (ES) is a pretty common pattern in the Solana apps ecosystem. ES are keys that are expected to sign the transaction and be discarded right after. An example of when they are needed is the SystemProgram.createAccount instruction. When creating a non-PDA account, this instruction requires the new account to be a signer to verify that whoever calls this instruction actually holds authority over this account.

Most of the time, app developers use Keypair.generate() to create Ephemeral Signers. Then they sign a transaction that requires an ES with the Keypair and throw it away immediately after. This pattern works pretty well when the signed transaction is immediately sent and executed. That said, it prevents a certain class of use-cases when the transaction is stored on chain and executed later when a certain condition is met, e.g. time lock is released, multisig approval threshold is reached, such as with some Smart Wallet implementations (Realms, Squads, Clockwork etc). In these cases, the Ephemeral Keypair will not be available to sign the “execute” transaction because it has already been “forgotten”.

Proposed Solution

Please refer to the linked Pull Request for the details

Implementation

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