2

What caused the huge drop of the mempool from 60 MB to Less then 1 MB?

These transaction didn't get processed there was no 60 MB block mined at the time.

This occurred at 10:38 pm 29th August 2017 NZ time

Mempool dropping to zero

6

It didn't goto zero. You can look at alternate sources https://core.jochen-hoenicke.de/queue/#2d . What happened most probably is that blockchain.info's node went down/rebooted momentarily.

  • If that was the case I would have expected to see it recover, but it never did, seems like they started to ignore spam transactions (transactions with very low fees) – trampster Sep 3 '17 at 12:10
1

It looks like the node whose mempool size is used to generate this chart was rebooted. Also, this node appears to be running an old version of Core or another node software, because recent versions of Core persist the mempool across restarts.

Also see: How do transactions leave the memory pool?

-3

65000 transactions is subtracted. They are still there (55441+14199) as long they are not canceled. The reason of subtraction seems to be too low fees, lesser than 30 satoshi. Maybe blockchain.info do not want to count "spam and attacks" in the statistics? It happened around 12:00 here in sweden. And a break out +$200 in Bitcoin price followed around 15:30.

The pools are only in the nodes. What they do when it gets full is up to them.

https://bitcoinfees.21.co

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