Feature Request: Specify an AccountID instead of just "str"

[MartinThoma]

In a couple of places you could specify that a field should contain a stellar account id, e.g. PaymentOperation.from_ and PaymentOperation.to:

from pydantic import ConstrainedStr

class AccountId(ConstrainedStr):
    regex = "G[A-Za-z0-9]{55}"

[overcat]

Hello, thank you for your suggestion, but I assume that the data provided by Horizon is reliable, so I currently have no plans to add additional verification.