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In order to allow for a little bit more flexibility when mining blocks it would be nice to have a more low level block API available. Currently the eth_getWork and eth_submitWork RPC calls do not allow miners to make any changes to the pending block which in turn make large scale mining setups quite complicated given the deficits of the Ethereum stratum protocol variants currently in use.
Thus I would like to propose to add two new RPC API endpoints:
parity_getRawBlockByNumber should return a RLP encoded block and should accept the same parameters as eth_getBlockByNumber (including returning the pending block)
parity_submitRawBlock should accept a RLP encoded block and publish the block to the network (similar to the eth_sendRawTransaction call)