bank

type Account struct {
	Number    AccountID
	PIN       PIN
	Balance   float32
	Assets    map[exchange.Symbol]uint64
	Suspended bool
	Tapped    bool
}

type AccountID uint64

type Bank interface {
	Open() Token
	PIN(Token, PIN) Error
	Balance(Token) (float32, Error)
	Transfer(Token, float32, AccountID) Error

	SetAsset(AccountID, exchange.Symbol, uint64)
	GetAssets(Token) (map[exchange.Symbol]uint64, Error)
	TransferAsset(Token, exchange.Symbol, uint64, AccountID) Error // Move [3] shares of [2] from [1] to [4]

	Freeze(AccountID)
	Thaw(AccountID)
}

type Error uint

type PIN []int

type TapID uint

type Token struct {
	Account AccountID
	PIN     PIN
}