Can a GSN signer be changed after initialization?

abcoathup · January 12, 2020, 11:10pm

There isn't a mechansim to change the trusted signer unless you explicitly added one to call _setTrustedSigner:

OpenZeppelin/openzeppelin-contracts-upgradeable/blob/v2.2.2/contracts/GSN/bouncers/GSNBouncerSignature.sol#L63


      
              }
          
              function _getTrustedSigner() private view returns (address trustedSigner) {
                bytes32 slot = TRUSTED_SIGNER_STORAGE_SLOT;
                // solhint-disable-next-line no-inline-assembly
                assembly {
                  trustedSigner := sload(slot)
                }
              }
          
              function _setTrustedSigner(address trustedSigner) private {
                bytes32 slot = TRUSTED_SIGNER_STORAGE_SLOT;
                // solhint-disable-next-line no-inline-assembly
                assembly {
                  sstore(slot, trustedSigner)
                }
              }
          }

The options would be to:

Upgrade the contract using OpenZeppelin SDK (if you used upgradeability)
Create a new contract with functionality to change the trusted signer and transition to using that contract

Alternatively, you could transfer anything else controlled by the hardware wallet private key. Then you could use that private key for only a trusted signer. See the following tutorial on how to setup a trusted signing process:

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Advanced GSN: GSNRecipientSignature.sol Guides and Tutorials	2	5694	July 7, 2020
Using the OpenGSN forwarder instead of a custom "minimal" one Defender	1	526	April 6, 2023
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Can a GSN signer be changed after initialization?

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