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I'm trying to support Argent wallet signing (contract wallet / compatible EIP-1271) through Wallet-Connect.

Let's say I have a Gnosis-Safe with the following setup: (owners: [argent-contract-addr], threshold: 1).

I'm able to obtain a signature of my transaction's txhash from Argent via Wallet-Connect, but this signature is signed by argent-eoa-addr controlling argent-contract-addr. Given Gnosis-Safe is compatible with EIP-1271 as well as Argent wallet that provides isValidSignature, it should be possible.

How can adjust this signature to be understood by the Safe as a contract signature? From the safe's code, it looks like I should modify v -> 0x00 but it seems that's not just it when I look at the contract code.

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I'm also trying to understand this test but it's not yet clear. Is there any documentation on how to build contract signatures compatible with Safe?

Greg Jeanmart
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1 Answers1

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To encode an EIP-1271 signature you would take the data returned by your signature function (for Argent this should be the data returned by eth_sign when connected via WalletConnect) and encode it with 2 parts.

The first part contains the address of the owner and the type. This is encoded as 0x<left-padded-owner-address><left-padded-data-position><type-0>.

And the second part is the data.

If you have a Safe where the only owner would be an Argent wallet (e.g. 0xfBfe33a4462Ff0Bd86730499f65eBF7466914519) the signature bytes would look the following.

// Prefix
0x 
// Owner address: 0xfBfe33a4462Ff0Bd86730499f65eBF7466914519
000000000000000000000000fBfe33a4462Ff0Bd86730499f65eBF7466914519
// Data offset: 65 bytes (32 bytes for each r and s and 1 byte for v)
0000000000000000000000000000000000000000000000000000000000000041 
// Type
00
// Signature data returned by `eth_sign`
bde0b9f486b1960454e326375d0b1680243e031fd4fb3f070d9a3ef9871ccfd5
7d1a653cffb6321f889169f08e548684e005f2b0c3a6c06fba4c4a68f5e00624
1c

More details at: https://docs.gnosis-safe.io/contracts/signatures#contract-signature-eip-1271

Richard
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  • Thanks Richard for the explanation, it makes more sense. However, I'm getting the following exception Fail with error 'Invalid contract signature location: data not complete' (GS023) for the following signature 0x0000000000000000000000002ac922cec780521f8ffab57d26b407936c352b820000000000000000000000000000000000000000000000000000000000000041003f65cc85fb5c5d059c1af0f716dec562bcab3d828bdb7dc91c059f4604413ce82999e73c6e971ff340f298cd1cd34272545c32c78b0a3e848dbebd48a0f96ed31c (txhash -> 0x49dfb17562ad7c0f0a55d46d4d1fec260fc9e95c29beadb5f4f75151a32ae1f3 – Greg Jeanmart Mar 04 '22 at 21:24
  • Ohh yeah mistake ob my side you need to include the length of the data – Richard Mar 04 '22 at 22:16