I'm hosting a Listening Bitcoin Node in Capital of Pakistan. I want to know the Block height when Transaction entered the mempool. Right now I'm using the time from the Json format of the Transaction and Checking the Block height against it. Do you guys think that this method is reliable or I fear that transactions in my mempool have more latency than usual node in Europe. Should use an Api to find the Entry Block Height of the transaction?
Please also suggest an api also?