Wallet attribute: Sign in with Ethereum (SIWE) UX

[polymutex]

Sign In With Ethereum (SIWE) is a standard for connecting to websites by proving ownership of an Ethereum address. It is a standardized signature payload format which wallets can and should display in an easy-to-understand UI widget.

While the raw text payload is made to be human-understandable, the intention of the standard is also to be machine-parsable so that wallets can render it nicely.

Walletbeat should check how wallets present SIWE signing requests, and rate whether they display this appropriately for users to understand what they are signing, beyond just showing the raw text payload.