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Remove reliance on "ZeroLink" special label #1549
Checking the "ZeroLink" special label is not only a code smell, but it actually enables Attack 1 (Remix Attacks), that Udi described in his presentation on Breaking Bitcoin. https://www.youtube.com/watch?v=DqhxPWsJFZE
This change removes the label reliance and tries to check if the new coin that arrived spends a coin that is already enqueued instead.