Funny math or how to get money from exchange for nothing

Technical Discussion
#1

I made withdrawal (100 ECOB) from yobit: http://chain.nem.ninja/#/transfer/89693bbb7bf342394a5ae23c2191581f23c5dc22b57a9e045919a4ef577a0dee

They get 3 ECOB as fee from me (3х0.00000307=0.00000921 BTC) and paid 2 XEM (2х0.0000578=0.0001156 BTC) as commission to NEM harvester. Prices - current prices on Yobit.net. So they paid to harvester 12 times more (0.0001156 BTC / 0.00000921 BTC = 12.55) than get from me.

[QUESTION 1] Who exactly get this money? Do yobit have heir own node where this 2 XEM fee is accumulated or someone else received this? Is there way to be 100% sure?

[QUESTION 2] should we report about that to yobit?

[QUESTION 3] may be we could earn money on that? Just deal with the harvester that will get this XEM fee and send many withdrawals with 0 ECOB to any address until yobit will be out of XEM? :slight_smile:

[QUESTION 4] Why exchanges pay top dollar (2 XEM instead of 0.05 XEM) per transaction? May be this could be great idea to make a service that will show you what is the current safe fee to guarantee successfull transaction in n minutes? like https://ethgasstation.info/ for ethereum?

#2

Ad1 2 XEM goes to harvester. In your example:
http://chain.nem.ninja/#/account/NDQRQQ-PB3ACU-THQICR-OQXHDC-RAKACF-L6XEH6-5Q5V/0

Ad2 Why? They decide to pay 2 XEM when they can pay 0.1 XEM. Of course you can notify them but try contact with yobit support :slight_smile:

Ad3 Harvester is random. I don’t think you can contact with all of them :slight_smile:

Ad4 There is need for such a tool because in NEM you have no miners. There is only couple full blocks (120tx) per month so minimum fee is always ok.
They pay more because they don’t notice that fees was lowered by factor 20.

#3

Of course you can notify them but try contact with yobit support :slight_smile:

Reported to them, let’s see how fast they reply. They have many transactions a day, it’s really strange that no one care about this money loosing.

Harvester is random. I don’t think you can contact with all of them

By random you mean that as more important you are as more chances to harvest block? So if sender send NEM throw specific hode - this does not mean that all blocks will be put to this exact node?

There is need for such a tool because in NEM you have no miners. There is only couple full blocks (120tx) per month so minimum fee is always ok.

It’s now, but how about if NEM will become more popular for ICOs and people start use it? :slight_smile: Full block is 120tx/s or 120tx/block? I read tech doc, but looks like I should review this part once again…

#4

I don’t know how technically works choosing lucky harvester. Tech ref should tell about this. But I’m pretty sure that sender can’t decide who receive transaction fees.

There is 2tx/s and 120 per block (one minute block). But this is artificial limit and can be increase if needed (with current version).
After catapult release there will be even more possibilities.

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