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Relay first-double-spend transactions #3354

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wants to merge 3 commits into from
Closed

Relay first-double-spend transactions #3354

wants to merge 3 commits into from

Commits on Dec 2, 2013

  1. Detect double spends, and fire a DetectedDoubleSpend signal 

    Detects two double-spend conditions:
1) Receive a transaction that conflicts with a mempool transaction
2) New block contains a transaction that conflicts with a mempool transaction

... and fires a new signal. Future commits will use this signal handler
to note the double-spend attempt if the transactions are in our wallet,
and will relay first double-spends.
    @gavinandresen
    gavinandresen committed Dec 2, 2013
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  2. CBloomFilter::clear() method

    @gavinandresen
    gavinandresen committed Dec 2, 2013
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  3. Relay first-double-spend transactions 

    Instead of dropping double-spent transactions, relay them to peers.
Why? To make it easier for merchants to quickly detect attempted
fraud for low-value, in-person purchases.

A bloom filter is used so that only the first double-spend is
relayed, to prevent an attacker from mounting a network
denial-of-service attack by flooding it with double-spends of
a transaction output they control.
    @gavinandresen
    gavinandresen committed Dec 2, 2013
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    9344275 View commit details
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