- Proxy contract: Every user has a proxy contract and all transactions are sent via the proxy contract. It is compatible with all existing smart contracts.
- _msgSender(): All transactions are sent via a single UniversalForwarder contract and the target contract must support the _msgSender() standard. It preserves the user's signing key address as their identity.
- A Universal Forwarder: Our RelayHub.sol can be used for the _msgSender() standard.
- Minimal wallet contract: Our proxy contract only requires 67k gas to deploy & 26k gas per transaction. It is minimal code and supports batching transactions. As well, its replay protection supports out of order-transactions (bitflip) and concurrent transactions (multinonce).
- GnosisSafe: We have incorporated GnosisSafe and our library tracks the replay protection nonce such that it is meta-transaction friendly. It is an audited wallet contract that is increasingly widely used.
| Name | Deploy Wallet | 1st Transaction | 2nd Transaction | 10 Transactions (AVG) | 100 Transactions (AVG) | Meta-deployment Echo Contract |
|---|---|---|---|---|---|---|
| Gnosis Safe | 223,240 | 39,014 | 24,014 | 24,009 | 24,011 | 24,9179 |
| Proxy (Bitflip) | 67,303 | 39,718 | 24,698 | 24,701 | 24,704 | 25,9423 |
| Proxy (Multinonce) | 67,303 | 39,490 | 39,502 | 39,521 | 27,228 | 25,9239 |
Deploy wallet. Both proxy contracts are deployed using EIP-1167 which is the minimal clone factory technique. Whereas Gnosis Safe deploys a proxy contract using CREATE2 and then has ~5 storage operations during setup.
1st Transaction. All wallet contracts must initially set the nonce field which results in a
higher gas cost.
2nd Transaction. Both Gnosis Safe and Proxy-bitflip are comparable as the nonce field is
reused. Multinonce is higher as it supports multiple nonce queues. By default it maintains 10 queues
and the implementation cycles through each nonce queue in turn.
10 Transactions.Both Gnosis Safe and Proxy-bitflip are comparable. Multinonce is higher as it supports multiple nonce queues. By default it maintains 10 queues an
100 Transactions. All wallet contracts have comparable gas costs. The nonce field is re-used for
every new transaction. The gas cost for bitslip should be around 24k gas for 255 transactions, and
then it needs to set a new nonce field which is 39k gas, then it will again be 24k gas for 255
transactions
Meta-deployment Echo Contract. All wallet contracts have comparable gas costs for deploying an echo contract. Each wallet contract delegate calls into a global deployer and the echo contract is deployed using CREATE2. We recommend deploying the contract and then calling an init() method (to avoid as2 msg.sender issues during deployment).
GPL-3.0