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Account impersonation

A configured impersonator key can submit raw transactions that this sandbox executes as its impersonatee: msg.sender, gas payer, nonce, and the ecrecover precompile all see the impersonatee. The address that physically signed is recorded on the receipt as signedBy for transparency. Multiple impersonator keys can share a single impersonatee; re-setting an impersonator simply overwrites its target. Map changes only affect future txs — past receipts keep the resolution they had at apply time.

Current mappings

Add mapping

Replace bytecode

Overrides the code at an address with bytecode you supply. Works on any contract — a real one from the upstream chain (the override shadows its on-chain code) or one deployed inside the sandbox. Balance, nonce, and storage are left as-is, so patch a contract in place while keeping its state. Paste runtime bytecode (deployed code), not constructor/init code. Leave the box empty (or 0x) to strip the code entirely. To put an upstream contract back to its real code, clear that account below.

Clear sandbox

Discards sandbox state — overlay balances/nonces/code/storage plus the recorded sandbox transactions — so reads fall back through to the upstream chain. Leave both boxes empty to clear everything, or scope it by account: an account is cleared when it's allowed by Only these (blank = all) and not listed under Except these. This is an account-level reset, not a per-tx undo, and it can't be undone.