Bitcoin
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BTC · 206w

So bitcoin cash just mined a 3.5 mb block, filled with (likely) spam.

I was making my daily rounds checking various stats sites about the bitcoin ecosystem. I periodically check bitcoin mempool fullness, prices of btc, bch, etc, and a few other things as I am sure many on this forum do. I happened to notice that bitcoin cash just mined a very large block, 3.5 mb to be exact, and that r/btc had a post about it. So I went and had a look and much to my surprise, this massive block only has 509 transactions in it (a typical block has about 2000 transactions per mb). For those interested here is the block on a block explorer showing the individual transactions in the block (warning, very large page load): https://bitinfocharts.com/bitcoin%20cash/block/494513/00000000000000000364ce272b7d3d1dc297b183b27008b8554bb4163b55511c So I decide to start poking around a bit and see what kind of transactions are in this block. I expected to find a single massive transaction and a few other "normal ones". The normal ones were there as expected, but instead of one big transaction there are dozens of transactions of all nearly identical format. Each of these transactions consists of a few hundred inputs, being aggregated to a single (or a few in some cases) output. Ok, so this looks like a spam transaction, but most spam transactions are someone taking a single input and fanning out to hundreds of outputs to bloat the mempool/blockchain. This one seems to be doing the opposite, taking hundreds of inputs and sweeping them to single outputs. Still could be a spammer, just cleaning up their spammy mess, rather than creating it. To find out, let's go one step back and look at the individual inputs to the transactions and when they were spent last (click "prev tx" by one of the inputs to see the transaction that created that particular UTXO). Although I don't have software to aggregate them properly and see when all of them were created, even a cursory glance clicking through them shows that the overwhelming majority were created in during period...
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