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/*
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Package blockchain provides two implementations of the fast-sync protocol.
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- v0 was the very first implementation. it's battle tested, but does not have a
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lot of test coverage.
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- v2 is the newest implementation, with a focus on testability and readability.
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Check out ADR-40 for the formal model and requirements.
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# Termination criteria
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1. the maximum peer height is reached
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2. termination timeout is triggered, which is set if the peer set is empty or
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there are no pending requests.
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*/
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package blockchain
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