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If the peer (whether pruned or not itself) supports sending pruned blocks
to syncing nodes, the pruned version will be sent along with the hash
of the pruned data and the block weight. The original tx hashes can be
reconstructed from the pruned txes and theur prunable data hash. Those
hashes and the block weights are hashes and checked against the set of
precompiled hashes, ensuring the data we received is the original data.
It is currently not possible to use this system when not using the set
of precompiled hashes, since block weights can not otherwise be checked
for validity.
This is off by default for now, and is enabled by --sync-pruned-blocks
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This shaves a lot of space off binaries
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Hide LMDB-specific stuff behind blockchain_db.h. Nobody besides blockchain_db.cpp
should ever be including DB-specific headers any more.
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Also make the number of blocks endian independant, and add
support for testnet
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