We want to cut the tail more aggressively, what matters is state, but not
old blocks and transactions that contracts don't use in any way. #3493
suggests that it's safe to limit the tail to one day, but let's be a bit
more conservative for now.
As a sidenote, EVM only allows to fetch things from the recent 256 blocks.
Signed-off-by: Roman Khimov <roman@nspcc.ru>
It directly affects node security and the default here MUST BE the safe choice
which is to do the verification. Otherwise it's just dangerous, absent any
VerifyBlocks configuration we'll get an insecure node. This option is not
supposed to be frequently used and it doesn't affect the ability to process
blocks, so breaking compatibility (in a safe manner) should be OK here.
