public static bool Transfer(byte[] from, byte[] to, BigInteger amount)
{
if (!ValidateAddress(from) || !ValidateAddress(to))
{
throw new Exception("The parameters from and to SHOULD be 20-byte addresses.");
}
if (amount <= 0)
{
throw new Exception("The parameter amount MUST be greater than 0.");
}
if (!IsPayable(to))
{
throw new Exception("Receiver cannot receive.");
}
if (!Runtime.CheckWitness(from) && !from.Equals(ExecutionEngine.CallingScriptHash))
{
throw new Exception("No authorization.");
}
if (AssetStorage.Get(from) < amount)
{
throw new Exception("Insufficient balance.");
}
if (from == to)
{
return(true);
}
AssetStorage.Reduce(from, amount);
AssetStorage.Increase(to, amount);
OnTransfer(from, to, amount);
return(true);
}
public static BigInteger BalanceOf(byte[] account)
{
if (!ValidateAddress(account))
{
throw new Exception("The parameters account SHOULD be 20-byte addresses.");
}
return(AssetStorage.Get(account));
}