user30768: I would like to estimate the total number of hashes (double SHA-256) that have been performed for bitcoin purposes.
As an estimate, I downloaded mining stats, massaged the numbers (assuming the rate shown is for the period ending at the date indicated and starting at the date before), came to 201⋅1024 hashes (equivalently 287.38 or 288.38 SHA-256) on Oct 28, 2017.
[update: 517⋅1024 hashes that is 288.74 or 289.74 SHA-256 by May 4, 2018].
Did I goof badly in that estimation of the hashes used for mining?
What other comparably non-negligible number of hashes is performed for bitcoin purposes, and how can that be estimated?
Clarifying: I'm looking only for things that represent a sizable fraction of the number of hashes spent for mining, say at least 0.5%; I'm totally willing to ignore the rest.

user52339: Assuming the numbers in the link are correct, then I think this would be right.
I got the same result by multiplying every entry by (1,000,000,000,000 * 3600 * 24 * 2) and adding them up. Came out to 2.008E^26.
But the total number of hashes is much higher. Every block in the blockchain is hashed by every client, every transaction is created using several hashes, etc, etc.

30768: <p>I would like to estimate the total number of hashes (double SHA-256) that have been performed for bitcoin purposes.</p>

<p>As an estimate, I downloaded <a href="https://api.blockchain.info/charts/hash-rate?scale=1&amp;timespan=all&amp;format=csv" rel="nofollow noreferrer">mining stats</a>, massaged the numbers (assuming the rate shown is for the period ending at the date indicated and starting at the date before), came to <strong>201⋅10<sup>24</sup> hashes</strong> (equivalently 2<sup>87.38</sup> or 2<sup>88.38</sup> SHA-256) on Oct 28, 2017.<br>
[<strong>update: 517⋅10<sup>24</sup> hashes</strong> that is 2<sup>88.74</sup> or 2<sup>89.74</sup> SHA-256 by May 4, 2018].</p>

<p>Did I goof badly in that estimation of the hashes used for mining?</p>

<p>What other <strong><em>comparably non-negligible</em></strong> number of hashes is performed for bitcoin purposes, and how can that be estimated?</p>

<p>Clarifying: I'm looking only for things that represent a sizable fraction of the number of hashes spent for mining, say at least 0.5%; I'm totally willing to ignore the rest.</p>
 52339: <p><strong>Assuming the numbers in the link are correct</strong>, then I think this would be right.</p>

<p>I got the same result by multiplying every entry by (1,000,000,000,000 * 3600 * 24 * 2) and adding them up. Came out to 2.008E^26.</p>

<p>But the total number of hashes is much higher. Every block in the blockchain is hashed by every client, every transaction is created using several hashes, etc, etc.</p>
