Improvements
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Add fields in Receipt: gas_fee, gas_sponsored, storage_sponsored. Accumulate gas_used in Receipt, not gas_charged.
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Delay block requests when we cannot process them to avoid wasting network bandwidth.
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Set block gas limit for Genesis block to 30_000_000.
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Define gas_used to be transaction gas limit for NotEnoughCash, the same as all other exceptions.
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Add support for WebSockets in RPC.
Bug Fixes
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Fix UnexpectedResponse from honest peers that causes peer demotion.
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Remove some untrue debug assert.
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Forbidden CALLCODE and DELEGATECALL to internal contracts.
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RPC now returns the correct rlp size of the block
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Fix a race condition that may cause optimistic execution to panic.
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Fill in correct block gas limit value for mining.
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Fix definitions and logics in transaction early execution error checking.
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Use block_count - 1 in target difficulty calculation because it's the unbiased estimation of exponential distribution parameter (past mining power).
Improvements
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Add cfx_getConfirmationRiskByHash RPC to get confirmation risk by block hash.
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Add getTransactionsFromPool debug RPC to collect transactions in pool.