How Does the Pool’s Software Communicate the Current Share Difficulty to the Mining Client?

The pool's software, specifically the Stratum server, communicates the current share difficulty to the mining client immediately upon connection and whenever the difficulty is adjusted (vardiff). This is done through a specific command within the Stratum protocol that includes the new difficulty target.

The mining client then uses this value to set the minimum requirement for a valid proof-of-work submission (a share).

What Specific Formula Is Used to Calculate the Bitcoin Mining Difficulty Adjustment?
What Are the Main Differences between the Original GetWork Protocol and the Stratum Protocol?
How Does Decentralized Mining Protocol Stratum V2 Aim to Reduce the Power of Pool Operators?
What Is the Role of the Pool’s Stratum Server Software in the Overall Infrastructure?
How Does the pool’S Target Difficulty for Shares Compare to the Network’s Target Difficulty?
How Does a Pool Operator Ensure That a Rejected Share Is Genuinely Invalid and Not Due to a Server Error?
How Does the Stratum Protocol Help in Automatically Adjusting Share Difficulty?
How Does the Stratum Protocol Handle the Adjustment of the Pool’s Share Difficulty?

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