/**
* <p>Gets the minimum value for a txout of this size to be considered non-dust by a reference client
* (and thus relayed). See: CTxOut::IsDust() in the reference client. The assumption is that any output that would
* consume more than a third of its value in fees is not something the Bitcoin system wants to deal with right now,
* so we call them "dust outputs" and they're made non standard. The choice of one third is somewhat arbitrary and
* may change in future.</p>
*
* <p>You probably should use {@link com.google.bitcoin.core.TransactionOutput#getMinNonDustValue()} which uses
* a safe fee-per-kb by default.</p>
*
* @param feePerKbRequired The fee required per kilobyte. Note that this is the same as the reference client's -minrelaytxfee * 3
* If you want a safe default, use {@link Transaction#REFERENCE_DEFAULT_MIN_TX_FEE}*3
*/
public BigInteger getMinNonDustValue(BigInteger feePerKbRequired) {
// A typical output is 33 bytes (pubkey hash + opcodes) and requires an input of 148 bytes to spend so we add
// that together to find out the total amount of data used to transfer this amount of value. Note that this
// formula is wrong for anything that's not a pay-to-address output, unfortunately, we must follow the reference
// clients wrongness in order to ensure we're considered standard. A better formula would either estimate the
// size of data needed to satisfy all different script types, or just hard code 33 below.
final BigInteger size = BigInteger.valueOf(this.bitcoinSerialize().length + 148);
BigInteger[] nonDustAndRemainder = feePerKbRequired.multiply(size).divideAndRemainder(BigInteger.valueOf(1000));
return nonDustAndRemainder[1].equals(BigInteger.ZERO) ? nonDustAndRemainder[0] : nonDustAndRemainder[0].add(BigInteger.ONE);
}
/**
* Returns the minimum value for this output to be considered "not dust", i.e. the transaction will be relayable
* and mined by default miners. For normal pay to address outputs, this is 5460 satoshis, the same as
* {@link Transaction#MIN_NONDUST_OUTPUT}.
*/
public BigInteger getMinNonDustValue() {
return getMinNonDustValue(Transaction.REFERENCE_DEFAULT_MIN_TX_FEE.multiply(BigInteger.valueOf(3)));
}
