A simple way to make sure data tx's don't crowd out cash tx's:

When building blocks, have two pools: tx's with OP_return data and tx's without. Always give first priority to tx's without OP_return data - even if their fees are lower than those with OP_return data.

That way, no cash tx will ever be crowded out by data tx's, even if blocks become full.

There could be a simple filter to keep SLP tokens in the cash-pool (or whatever other exceptions miners want to make).

That way, everybody is still free to use the blockchain however they want, but in times of high-usage, users might have to wait a little longer for a data-tx.

submitted by /u/Steve-Patterson
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source https://www.reddit.com/r/btc/comments/d67czm/a_simple_way_to_make_sure_data_txs_dont_crowd_out/