I've recently started to write up some of my observations I had on my Bitcoin Transaction Monitor project (https://mempool.observer/monitor).
I write about activity on the network I find interesting and worth sharing.

The first one is about fees-sniping and why transactions are time-locked to the current block height.
I expected something like this when plotting transactions by their arrival time and locktime:

https://b10c.me/data/mo/mo1-locktime-stairs/expected-pattern.png

However, it turned out that some of the transactions I observed were even time-locked to the next block.
These should have normally not been relayed to me.

The full write up can be found here:

The stair-pattern in time-locked Bitcoin transactions - The off-by-one-error that covered another off-by-one-error up - https://b10c.me/mempool-observations/1-locktime-stairs/

Will post more here if there is interest.