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Two-signature Ethereum wallet

Overview

This contract is a minimalistic and easy-to-use "two-sig" wallet. It has two or more owners and each action requires exactly two owners to sign.

Actions are:

  • forward funds
  • add owner
  • remove owner

Usage:

  • The proposal and subsequent confirmation by the second owner are two identical calls, just made from different sender addresses.
  • Each action is identified by a unique nonce that can be arbitrarily chosen by the users. The two signers have to use the same nonce.

The contract is intentionally reduced to a minimal feature set:

  • The signature "threshold" is not configurable, it is always 2.
  • There is no handling of transaction payload (data), only pure value transfers.

Example

Contract is deployed with Duosign([addr1, addr2, addr3]).

User1 with addr1 issues forward(addr4, 10**18, 7) where 10**18 means 1 ether and 7 is an arbitrarily chosen nonce. User1 sends the nonce to User2.

User2 with addr2 issues forward(addr4, 10**18, 7). The transaction gets executed only if all parameters match (destination address, value and nonce).