I just checked out the transactions where I withdrew BTC from MPH. It seems like MPH is making a profit of BTC withdrawal fees.
We pay 0.0004 BTC btw.
Here for example
https://blockchain.info/tx/e867c97db3c4332965acd73386f674db7d986dd055436dc048353b0fe4c58ee9The fee of this transaction for 2 recipients is 0.00049671 BTC . 2 recepients paid MPH 0.0008 BTC in withdrawal fees .
A minimum 0.00030329 profit for MPH per payout. Because MPH pays out when at least two people withdraw BTC. I haven't seen one transaction with only one recipient yet in my history.
Here a transaction with 23 recipients from MPH :
https://live.blockcypher.com/btc/tx/a75daf5f173ad6ad3dd8207de44acf0fe3c7cc943da5b5c428bd14f8f0b6b92f/Real Fees are 0.00219887 for this transaction. Fee per recepient would be 0.00009560304347826087.
23 recipients pay 0.0092BTC to MPH in withdrawal fees. MPH pays only 0.00219887 in real fees.
MPH has a profit of 0.00700113 BTC. Wow!
There is definitely room for lowering the fee if MPH wasn't greedy
Actually this is not true.
Pool doesn't use sendmany or rawtransaction feature because it can make things worse on current tx war.
Pool uses just plain "sendtoaddress" api which mean fees are automatically adjusted from network.
And pool only sends one address per once.
Here's miningpoolhub's main bitcoin address
12DdmN1y5enL72sN93sisUWQdT1gfF24qj
https://blockexplorer.com/address/12DdmN1y5enL72sN93sisUWQdT1gfF24qjCheck all payouts. All transactions have 2 outs. second outputs is for change address from pool to collect remain amounts.
I think you know what I mean if you are familiar with bitcoin internal. It's just bitcoin's spec and fundamental logic.
This is the link you brought.
https://blockchain.info/tx/e867c97db3c4332965acd73386f674db7d986dd055436dc048353b0fe4c58ee9Pool is sending to one address, and second address is the change address that pool receives.
This is the second link you brought.
https://live.blockcypher.com/btc/tx/a75daf5f173ad6ad3dd8207de44acf0fe3c7cc943da5b5c428bd14f8f0b6b92f/I don't understand why you picked that this transaction is from mph.
No it's not. There's no txid written like this in bitcoin transaction in mph.
Why did you think it's from mph?
I believe that is from poloniex. Look at the balance. 434.25359911 BTC alone in that address.
I understand that fee is high than usual, but pool doesn't try to get profit from this thing.
Please don't blame pool. We have to find solution from bitcoin environment like segwit, or bitcoin unlimited. That is the main reason causing these thing.
Yeah, pool lost some bitcoin by just sending amounts these days.
Pool can't run continually with loss. If you care about withdrawal fee, please delay it and withdraw it when it piles up much.
Or withdraw them in ethereum or other kind of coins.
I'll find better way to lower the fees. But please remember that pool doesn't try to get profit from it.