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There is no way to calculate the total hashing power from public information.

It's an estimate...

As someone who runs a mining pool for living, I know it's a lot less than an estimate. You can get very high effective hashrate with a toaster that has hashing speed of less than 10000 nonces per second. On the other hand, effective hashing power of a big miner is limited by processing speed of the mining pool software, so essentially the estimated hashing power is saturated.

All statistics only calculate nonces that result in difficulty that is within range of stratum difficulty and the block difficulty. In most pools that is 0-4 nonces per minute, or 0-0,0666... hashes/second. That is far from hashing power we see on Bitcoin statistics.

Interesting...

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