Neil Booth 351272f0b6 Small optimization for large wallets ...

Previously the verifier job would scan all transactions in
unverified_tx each time it ran.
Nothing was ever removed from this map; it would essentially
be the full set of transactions.
As the job runs about 10 times a second, for a wallet with 500 txs
this would be 5,000 useless loops a second.
This patch makes unverified_tx be simply the set of confirmed
transactions that haven't yet been verified.  txs are added once
confirmed, and removed once verified.  Hence it will almost always be
empty.

2015-08-28 12:39:19 +09:00

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