* header MMR in use within txhashset itself
works with fast sync
not yet in place for initial header sync
* add the (currently unused) sync_head mmr
* use sync MMR during fast sync
rebuild header MMR after we validate full txhashset after download
* support missing header MMR (rebuild as necessary) for legacy nodes
* rustfmt
* comments/docs
* rustfmt
* cleanup DBBackend
* cleanup DBBackend
* cleanup
* rename to HashOnly
* rustfmt
* cleanup backend.append()
* simply pmmr append api
no need to pass position when appending
* cleanup
* simplify vec_backend to match simpler append api
* rustfmt
* docs/comments
* rustfmt
* cleanup
When processing a new block, attemps to make the scope of the
corresponding `txhashet` lock as small as possible. The idea is
to avoid bad interactions with orphan locks or block post
processing (i.e. adapter events, etc)
* Go back to db for head and header_head
* Use batch consistently for db access
* Pass active txhashset and batch in the ctx
* Only update head in db if total work increases
* Only updated header_head if total work (on header chain) increases
* cuck placeholder
* rustfmt
* cuckatoo, early days
* rustfmt
* data structures are in place, siphash key creation is consistent with @tromp
* solver in place, (not yet working)
* cuckatoo test solver working with test nonce
* rustfmt
* update solver to remove adjacency list removals
* verifier functioning
* rustfmt
* Proper error handing in Cuckatoo module, couple of tests
* modify cuckoo/cuckatoo solvers and verifiers to function identically, in advance of trait refactoring
* rustfmt
* refactor PoW context into trait, default to using cuckoo context
* rustfmt
* create macros for integer casting/unwraps
* don't instantiate structs when just verifying, add test validation vector for cuckatoo 29
* rustfmt
* don't init cuckoo structs if just validating
* test fix
* ensure BH hashing for POW is only done within miner/validators
* introduce rewindable_kernel_view
cleanup header in extension
* cleanup and docs/comments
* txhashset does not need to be mutable here
* pull validate_kernel_history out into fn
* block_sums and full kernel sum verification
* rustfmt
* add docs/comments
* docs
* rustfmt
* comment on fact total_kernel_sum is redundant now
* make sure we setup block_sums correctly on a fork
* rustfmt
* replace those asserts with errors
* rustfmt
* Move Proof and Difficulty types to pow module. Difficulty scaling calculation.
* Diffculty scaling and size shift for 2nd PoW
* Backport e7eb26ee
* Test compilation fixes
* Scaling only need to go one way, as @tromp pointed out
* document what we do during pipe::apply_block()
* rustfmt
* wip
* rustfmt
* wip
* additional check_known_store and check_known_mmr checks in process_block
* rustfmt
* cleanup coinbase maturity check in process_block
* consolidate the "check in store" logic
add TODOs around the 50 block OldBlock logic
* rustfmt
* cleanup
* fix: if block in orphans queue has a forked parent, cause infinite loop in check_orphans()
* process all orphans at a given height before go to next height