Stamp

Stamps are information filled in by the xAccount contract and thus not mutable by the mail sender. They encode information about the mail sender and which xAccount was responsible for broadcasting this mail.

pub struct Stamp {
    id: MailId, 
    sender: AccountInfo, 
    emitter: AccountInfo, 
    //nonce: u32, # potentially next version; not relevant until batch vaas ready
}

Key	Type	Description
id	MailId	Unique identifier of a mail.
sender	AccountInfo	Sender of mail.
emitter	AccountInfo	VAA emitter (address of xAccount used).
nonce	u32	Used for batch VAAs; messages can be created with the same nonce to group them.