• Block: N/A
  • Difficulty: N/A
  • Total Workers Online: N/A
  • Total Pool Speed: N/A



Connecting your miners

Connect your mining hardware to stratum+tcp://stratum.coinstack.io on port 3333.

Use the worker name as your username. Worker names are in the format username.workername

Passwords are automatically generated but not checked, you can use anything you like.

Important: if you forget the stratum+tcp:// prefix your miners may not connect to the pool. Coinstack does not support http:// mining.

Basic terms

Shift - A shift is the time period between reward calculations and payouts. The length of a shift is generally 1 hour.

What does "pool luck" mean?

Pool luck is a number showing how many shares the pool needed to find some block relatively to an average number of shares needed for finding a block. There are three numbers in stats showing luck in different time periods.

If the luck is above 100% it means that the pool needed less shares then expected for the given difficulty. If the luck is below 100%, more shares were needed. E.g. if the luck is 200%, the pool found two times more blocks in the given time period then is an average.

The important thing is that the luck shows only history and says nothing about future blocks. Finding block is fully independent on historical events so that e.g. joining the pool only when there is high luck and disconnecting when the luck is low doesn't make any sense. In long term, the luck is always 100%.

How are shifts paid?

Shifts are paid when they close. Shifts are 1 hour OR (difficulty) shares long, whichever comes first.

At the end of each shift the total number of shares submitted are counted and each workers contribution is calculated as a percentage. If the pool has found a block or blocks during the specified shift, the block reward is divided amongst all contributing workers based on effort.

Shift rewards are calculated using the following formula. shift reward = ((block value) - pool fee)

How many bitcoins can I mine with my hashrate?

You can get an estimation of how much you should earn per block using the following formula:

reward = (your hashrate/pool hashrate) * ((block reward) - pool fee)

You can get pool hashrate from the stats page, block reward is currently 12.5BTC + fees.

This formula only applies if you mine during a whole shift. For more information, learn about our shift-based reward system.

Why is the hashrate reported on my profile incorrect?

The hashrate shown in your account is based on statistics of your shares in the last 5 minutes. If you started mining just a few hours ago (see pool stats), then it may be lower than what your hashrate actually is. The graphs can show spikes when the difficulty is automatically adjusted because your share rate will rise temporarily before it is adjusted again. It's just informative, it doesn't have any impact on mining or your reward.

How does Vardiff work?

The pool automatically recognizes strength of your mining hardware and adjusts work difficulty for the miner accordingly. With Vardiff implemented, each miner is set to send results of its work to the server around 20 times per minute. That's the goal. If the miner is too fast, Vardiff increases the difficulty for its work and when too slow, the difficulty decreases.

This does not affect your score or rewards. For example: When your miner submits a proof of work with difficulty set to 8, it is counted as 8 shares by the pool. When submitted with difficulty 1 then only 1 share is counted. It takes 8x more work to find a proof of work when the difficulty is set to 8 than when set to 1. So it is valued 8x more.

The algorithm re-evaluates your miner's strength continuously but it doesn't change the difficulty when your hashrate is stable.

CEO of Independent Reserve, Mr Adam Tepper answers some common questions about Bitcoin.