Helper function to sign a message.
Note that this function prepends the account address (32 bytes) and 8 zero-bytes to ensure that the message is not a transaction.
Note that the current prepend is temporary and will later be replaced.
Parameters
account: AccountAddress
message: string | Uint8Array
the message to sign, assumed to be utf8 encoded string or a Uint8Array/buffer.
Helper function to sign a message. Note that this function prepends the account address (32 bytes) and 8 zero-bytes to ensure that the message is not a transaction. Note that the current prepend is temporary and will later be replaced.