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Update 0020-ckb-consensus-protocol.md #440

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26 changes: 26 additions & 0 deletions rfcs/0020-ckb-consensus-protocol/0020-ckb-consensus-protocol.md
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Expand Up @@ -16,6 +16,7 @@ Created: 2019-6-19
* [Specification](#Specification)
* [Two-Step Transaction Confirmation](#Two-Step-Transaction-Confirmation)
* [Dynamic Difficulty Adjustment Mechanism](#Dynamic-Difficulty-Adjustment-Mechanism)
* [Protocol Parameters](#Protocol-Parameters)

<a name="Abstract"></a>
## Abstract
Expand Down Expand Up @@ -348,3 +349,28 @@ $$

The two cases differ only in the edge cases. The first case guarantees that the total reward issued in epoch *i* + 1 will not exceed R(*i* + 1).

<a name="Protocol-Parameters"></a>
### Protocol Parameters

We now list the actual parameters used when implementing this protocol in Nervos CKB.

| Name/Explanation | Related Name in our Client | Value |
| :-------------- | :----------------------------------- | :-------------- |
| maximum number of uncles per block | MAX_UNCLE_NUM | 2 |
| $o_{\rm ideal}$ | DEFAULT_ORPHAN_RATE_TARGET | 2.5% |
| $L_{\rm ideal}$ | DEFAULT_EPOCH_DURATION_TARGET | 4 hour |
| *w<sub>close</sub>* | TX_PROPOSAL_WINDOW | 2 |
| *w<sub>far</sub>* | TX_PROPOSAL_WINDOW | 10 |
| $C_{\rm m}^{\rm max}$ | MAX_EPOCH_LENGTH | 1800 |
| $C_{\rm m}^{\rm min}$ | MIN_EPOCH_LENGTH | 300 |
| block size limit | MAX_BLOCK_BYTES | 597000 |
| block cycle limit | MAX_BLOCK_CYCLES | 3500000000 |
| The upper bound number of `txpid`s in a proposal zone | MAX_BLOCK_PROPOSALS_LIMIT | 1500 |
| Proposer fee share |PROPOSER_REWARD_RATIO | 40% |
| Before which a block reward cannot be spent | CELLBASE_MATURITY | 4 epoch |

Several other parameters are implemented in the consensus component of our client. While a detailed description of these parameters falls outside the scope of this document, you can find them in [RFC15](https://github.com/nervosnetwork/rfcs/blob/master/rfcs/0015-ckb-cryptoeconomics/0015-ckb-cryptoeconomics.md).

* DEFAULT_SECONDARY_EPOCH_REWARD: 1.344 billion per year
* INITIAL_PRIMARY_EPOCH_REWARD: 4.2 billion per year
* DEFAULT_PRIMARY_EPOCH_REWARD_HALVING_INTERVAL: 4 years
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