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sign-message.md

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Sign Message

{% hint style="info" %} Make sure you initialize Blocto SDK first {% endhint %}

Once your app is connected to Blocto wallet, it can sign message on behalf of the user, with the user's permission.

To sign a message, the app must specify the sign type. All available types are listed below.

Sign Type Type Message
ETH Sign EvmSignType.ETH_SIGN hex string (0x prefix)
Personal Sign EvmSignType.PERSONAL_SIGN plain string
Sign Typed Data v3 EvmSignType.TYPED_DATA_V3 json string
Sign Typed Data v4 EvmSignType.TYPED_DATA_V4 json string

Sign Typed Data

(currently identical to Sign Typed Data v4)

 EvmSignType.TYPED_DATA json string 
bloctoWalletProvider.SignMessage(
    message: message,
    signTypeEnum: [SignTypeEnum.Eth_Sign/SignTypeEnum.Personal_Sign/SignTypeEnum.SignTypeData/...],
    address: walletAddress,
    callback: signature => {
        Debug.Log($"Signature: {signature}");
    });

For dApps relying on signMessage for off-chain authentication, Blocto follows EIP-1654. To verify the signature, you need to call a method on the wallet contract to check if the signature came from a rightful owner of the wallet contract.