Just before block 537562, I had the following transactions in my mempool:
'a4ca904361952c8a27bcf1fd36e5bc8ccdc5d42ceb72cfba60c017fb9cbbb0e5' '69718e60b6e7d20d5e56e097b2de9789007fb230d0205a90a1411ef8086672a0' '346b93674d91bfc5b5568f7e77dc969b5c87351135a1c75d551c1418533164f2' 'e8fddfc634f2e3d535ad81d7dce314e543047bc0281854d9eded4d107fa4f525' 'da2fd9ed1a8ba7612b885377dc7018d8d0c35ad4cdd03a24829b9a0b8edbf123' '3318d59ac00f5dbdd223fcf9ab953e0eee2765b4d1d72285c33c75121e888eee' 'fc4aea4f7f3ae94bf65c6cc23b73e594f7c849ab5f1362ac78d157cf4af8bc8a' '1e7b6ebefd9cd4983f598831ed8082bcdab6b7857f2d302e7d4952e4f145f8e7' 'f0f20dcf5142895d19140b60830bd9f15b664294d8535c3dcc09ebe3398a2fa3'
These transactions simply disappeared from the mempool later without ever being mined. Why did this happen? At a time when fees are so low, I doubt they were the target of a replace-by-fee. What are the possible reasons for a mempool transaction to disappear? and is there a way to investigate what happened to these specific ones?
EDIT: these transactions had a feerate above the default
minrelayfee of 1 satoshi/Byte
EDIT2: I admit that I was not aware of question How do transactions leave the memory pool? , but my question is still different. I am interested in finding out why a specific transaction has disappeared from the mempool without ever being mined. Now it's a bit late to see if the transactions that I gathered were replaceable or not (nLocktime equal to 4294967294 - 0xffffff-1 - if I am not mistaken), but I will repeat my analysis taking this into account in the future.