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From: NITSOPOULOS KONSTANTINOS <NITSOPOULOS@mail.com>
To: bitcoin-dev@lists.linuxfoundation.org
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Date: Sat, 24 Apr 2021 13:02:31 +0200
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Subject: [bitcoin-dev] 7z block compression, 18%
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<html><head></head><body><div style="font-family: Verdana;font-size: 12.0px;"><div>Hi, I can compress new blocks by up to 18% using the 7z file type. I use wxHexEditor to dump a block&#39;s raw hex onto my disk, and then compress that with 7-Zip. I&#39;d like to see 7z built into Bitcoin Core, for block compression (storage &amp; propagation). The entire blockchain could be under 290GB if it&#39;s converted into a 7z archive-chain (&quot;7z-chain&quot;). I can compress some recent example blocks (hex -&gt; less hex) if anyone wants. A future BIP could try increase the block Weight Units limit by up to 21% if 7z blocks are smaller &amp; quick.</div>

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<div>Programming compression seems too difficult for me, so I&#39;m hoping somebody else does it!</div>

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<div>Eventually I think transactions can be compressed by replacing addresses (&amp; public keys) and coins, wherever possible, with just their own unique sequential index. TX amounts can also be compressed if they contain only a decimal digit or two, e.g. 00000000.10000000 XBT. A TX of 0.1 XBT between two existing addresses could be somehow compressed to half or maybe a quarter of its current size!</div>

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<div>-Tinos</div></div></body></html>