---
displayed_sidebar: generalSidebar
---

# v2.0 版本更新

在 Hydra 硬分叉（v2.0 版本）中，Conflux 将通过 8 个 CIP（Conflux 改进提案）引入几项重大升级。

## PoS 共识机制

Through [CIP-43](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-43.md) Hydra has introduced a PoS system to improve the finality of the whole Network. CFX 持有者可以将其 CFX 质押到 PoS，以保护高价值交易，并且还可以通过参与 PoS 获得 CFX 奖励。 For detail information, check [PoS Overview](../conflux-basics/consensus-mechanisms/proof-of-stake/pos_overview.md) page.

## Conflux eSpace

CIP-90 引入了一个全新的完全兼容 EVM 的空间。 这个新的空间被称为 eSpace，当前空间被称为 Core Space。 eSpace 遵循与 EVM 相同的规则，并支持 eth rpc，如 eth_getBalance，因此以太坊生态系统中的工具（web3.js, ethers.js, hardhat 等）可以直接在 Conflux 中使用。 Check [eSpace documentation](../../espace/Overview.md) for more info.

## 新增的内部合约

Hydra hardfork has intoduced three new [InternalContracts](../../core/core-space-basics/internal-contracts/internal-contracts.mdx):

- `ConfluxContext` (CIP-64)
- `PoSRegister` (CIP-43)
- `CrossSpaceCall` (CIP-90)

## RPC 变更

### cfx 命名空间 RPC 变更

- New added methods: [`cfx_getPoSRewardByEpoch`](../../core/build/json-rpc/cfx-namespace.md#cfx_getposrewardbyepoch), `cfx_openedMethodGroups`, [`cfx_getPoSEconomics`](../../core/build/json-rpc/cfx-namespace.md#cfx_getposeconomics).
- New added EpochNumber tag: `latest_finalized` indicating latest finalized (by PoS) epoch.
- `cfx_getStatus` reponse have two new field: `latestFinalized`, `ethereumSpaceChainId`
- Block header new added field: `posReference` which is the latest pos blockHash when the PoW block is mined.
- Block header's `custom` field's type has changed from array of `number array` to array of `hex string`.

```js
// before
custom: [[1, 2]]
// after 
custom: ["0x12"]
```

**Note: CIP-90 will break some block field's verifiability for example: hash**

### trace RPC breaking change

- `trace` RPC methods have some [big changes](../../core/build/json-rpc/trace-namespace.md#v20-trace-breaking-change)

### 新增命名空间

- [`txpool`](../../core/build/json-rpc/txpool-namespace.md)
- [`pos`](../../core/build/json-rpc/pos-namespace.md)

### eSpace eth RPC

The eSpace has introduced the `eth` namespace RPC, check the [RPC compatibility doc](../../espace/build/jsonrpc-compatibility.md) for details

## Conflux-rust 配置文件

The mainnet config file has been renamed from `tethys.toml` to `hydra.toml`, the `bootnodes` has changed and several options are added:

- `jsonrpc_http_eth_port = 8545`
- `jsonrpc_ws_eth_port = 8546`
- `public_evm_rpc_apis = "evm"`
- `evm_chain_id = 1030`

## 主网升级计划

1. Conflux client program need to be updated before `Epoch Number reaches 36935000` or `Block Number reaches 92060600` (around 10:00 Feb.23th, 2022(GMT+8))
2. The PoS registration start at `Block Number 92060600` (around Feb.23th at 12:00)
3. The PoS registration close at `Block Number 92751800` (around Feb.25th at 12:00)
4. The deadline for adding pos_config is before `Epoch Number reaches 37400000` (around Feb.28th 12:00). Hardfork upgrade completed at this time.

## 测试网升级计划

1. Conflux client program need to be updated before `Epoch Number reaches 55095000` or `Block Number reaches 68845000` (around 10:00 Dec.9th, 2021(GMT+8))
2. The PoS registration start at `Block Number 68845000` (around Dec.9th at 10:00)
3. The PoS registration close at `Block Number 69245000` (around Dec.11 at 18:00)
4. The deadline for adding pos_config is before `Epoch Number reaches 55665000` (around Dec.13th 15:00). Hardfork upgrade completed at this time.

For detail infomation check [Conflux v2.0.0-testnet Hardfork Upgrade Announcement](https://forum.conflux.fun/t/conflux-v2-0-0-testnet-hardfork-upgrade-announcement/12556)

## 升级 CIP 列表

以下是这些 CIP 的简要介绍。

### CIP-43

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-43.md)

In this [CIP](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-43.md), we propose introducing finality to the Conflux chain via voting among staked CFX holders. This will increase the confidence of high-value transactions happening on Conflux in the future and protect Conflux against potential 51% attacks from PoW.

### CIP-64

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-64.md)

Currently, transactions on Conflux have no direct access to the number of the epoch they are executed in. To maintain EVM compatibility, this CIP introduces a new internal contract that makes this information available to contracts.

### CIP-71

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-71.md)

Fully disable the anti-reentrancy for their contract.

### CIP-76

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-76.md)

We should remove VM-related constraints in syncing blocks, like requiring the transactions to have enough gas limit.

### CIP-78

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-78.md)

Fix incorrect fields in transaction receipt.

### CIP-86

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-86.md)

Reduce the period of difficulty adjustment and apply the simple moving average method.

### CIP-90

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-90.md)

This CIP aims to introduce a new fully EVM-compatible space. The new space is called `eSpace`, and the current space is called `Core` Space. The eSpace follows the same rule as EVM and supports eth rpc like `eth_getBalance`, so the tools from ethereum economics can be used on Conflux directly.

### CIP-92

[Detail link](https://github.com/Conflux-Chain/CIPs/blob/master/CIPs/cip-92.md)

Enable Blake2F builtin function in [EIP-152](https://github.com/ethereum/EIPs/blob/master/EIPS/eip-152.md).