Quote from: peoples on March 19, 2019, 01:10:38 PM

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alright. Thanks

So as a pool operator/developer one of the most important things is to make sure that every single miner connected to the pool gets different work. ?
Which is controlled by the nonce/extranonce each miner gets, right ?

For my understanding , nonce itself is to small for modern miners anyway and overflows under a second. So miner starts changeing extranonce, which is also just a number that will be incremented?
Question: How is guaranteed that every single miner realy does unique work. ? How is secured that each miner changes nonce and extranonce values differently to make sure no duplicated shares are created.

The coinbase transaction is what differs for every miner.

Stratum sends a different, incomplete coinbase transaction to each miner.
https://bitcointalk.org/index.php?topic=557866.0

Every pool will have a different coinbase for the simplest reason: no pool wants to send their block reward to another pool.
However, if the pool has 2 or more different work generators (i.e. 2 or more different work servers) they of course must ensure that the coinbase is different on them.

Each miner on the same pool gets a slightly different coinbase from the pool work generator.
If not, then the pool luck will drop - and no pool wants ... e.g. 50% luck coz they always send the same work to two different miners.