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* Block proposing based on timestamp, instead of
count of blocks generated.
* Add method to find tips of each round in blockdb.
* Block proposing based on tips of last round found
on blockdb.
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* Generate correct hash/signature when generating blocks.
* Refine naming, types.
- type of chainNum should be uint32 by default
- rename blockCount to blockNum
- rename nodeCount to chainNum
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interface (#110)
Since third party apps will possibly implement their only blockdb class,
it make sense for the interface to be in core.
Also add GetNumShards into the governance interface.
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- Replace map with slice
Compared to slice, accessing to map is slower and
the memory usage is inefficient.
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* Add hash to block
* Check block hash in Consensus.sanityCheck
* Add hashBlockFn in block generator.go
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* Add blocks generator.
This helper would randomly generate blocks that forms valid DAGs.
* Add revealer
Revealer is an extension of blockdb.BlockIterator. The block
sequence from 'Next' method would be either randomly (see
RandomRevealer) or meeting some specific condition (ex. forming
a DAG, see RandomDAGRevealer).
* Add test for sequencer based on random blocks.
* core: refine Application interface and add Governance interface (#24)
Add a new Governance interface for interaction with the governance contract.
Also remove the ValidateBlock call in application interface as the application should validate it before putting it into the consensus module.
A new BlockConverter interface is also added. The consensus module should accept the BlockConverter interface in future implementation, and use the Block() function to get the underlying block info.
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