listSlots method
Requests every slot from the Satscard. If the spendCode
is provided then
the private keys will also be available for SlotStatus.unsealed slots
Implementation
Future<List<Slot>> listSlots(Transport transport,
{String spendCode = "", int limit = 10}) =>
Implementation.instance
.satscardListSlots(transport, spendCode, limit, handle)
.then((value) => _sync(value));