Replying to Avatar Nostrostr

Then how are people posting jpegs without permission? It might be more difficult with nodes filtering their mempools, but they can still pay miners to put their spam into blocks.
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BitcoinIsFuture 8mo ago

Bitcoin full nodes like Bitcoin Knots are securing the Bitcoin network and miners must comply with the Nodes and provide consensus-compatible blocks. So if majority of Nodes filter out spam, it will be very hard for spammers to turn Bitcoin decentralized freedom Monetary network into a meme shitcoin. "Nodes define what "miner" is." This is explain here:

https://medium.com/bitcoinerrorlog/who-secures-bitcoin-95b19bbcda3c

A balanced explanation about OP_RETURN is here:

https://archive.is/j5KWw

And some of the risk of leaving spam unfiltered and unlimited are in the following screenshot:

I hope that would be helpful.

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Nostrostr 8mo ago

Nodes don’t reject blocks with transactions that have a massive amount of arbitrary data. They are still technically valid. Nodes simply filter these transactions out of their mempools and prevent them from being relayed to other nodes and miners. Spammers can circumvent these filters by submitting their spam directly to miners and paying them a high enough fee. Check Marathon’s Slipstream product.

If nodes really wanted to assert their authority, they would have to start rejecting blocks with too much arbitrary data. This would be extremely difficult as there would be disagreements about what counts as arbitrary data.