Dust Warning

[docelimao]

During the construction of a transaction, I tried to send below 300 sats and the wallet warns about the Dust limit in an "error" message. However, it seems to me to be a message with the error code and my suggestion is that an explanatory message be displayed about the Dust Limit, why it exists and how important it is to prevent spam.

[thunderbiscuit]

I think it'd be great to figure out the exact value of this dust amount, and we could check for it when people attempt to create the transaction directly.

Note to myself for future reference: the code for this is here (BDK) and here (rust-bitcoin).