Overview

Conflux-Rust v2.1.0 is a small hardfork upgrade. In this upgrade 5 new CIPs will be activate, and also some improvement about storage and RPC.

New CIPs#

CIP-94: proposes to use on-chain DAO voting to decide and update reward parameters without hardfork.
CIP-97: proposes to remove account's staking lists.
CIP-98: Fix a bug in BLOCKHASH opcode in eSpace.
CIP-99: Allow more not-voting terms before we force-retire a node, and make the unlock period of a retiring node shorter to allow the node to rejoin the PoS voting faster.
CIP-105 PoS staking based minimal DAO vote count.

New InternalContract#

CIP-94 also has introduce a new InternalContract ParamControl at hex address 0x0888000000000000000000000000000000000007. This contract can be used to retrive parameter info and participate in DAO vote.

// SPDX-License-Identifier: MIT

pragma solidity >=0.8.0;

interface ParamsControl {
    struct Vote {
        uint16 topic_index;
        uint256[3] votes;
    }

    /*** Query Functions ***/
    /**
     * @dev cast vote for parameters
     * @param vote_round The round to vote for
     * @param vote_data The list of votes to cast
     */
    function castVote(uint64 vote_round, Vote[] calldata vote_data) external;

    /**
     * @dev read the vote data of an account
     * @param addr The address of the account to read
     */
    function readVote(address addr) external view returns (Vote[] memory);

    /**
     * @dev Current vote round
     */
    function currentRound() external view returns (uint64);

    /**
     * @dev read the total votes of given round
     * @param vote_round The vote number
     */
    function totalVotes(uint64 vote_round) external view returns (Vote[] memory);

    /**
     * @dev read the PoS stake for the round.
     */
    function posStakeForVotes(uint64) external view returns (uint256);

    event CastVote(uint64 indexed vote_round, address indexed addr, uint16 indexed topic_index, uint256[3] votes);
    event RevokeVote(uint64 indexed vote_round, address indexed addr, uint16 indexed topic_index, uint256[3] votes);
}

Improvements#

Storage#

Allow snapshots to be removed during recovery. This reduces the disk space requirement for full node sync or recovery.

In v2.1.0 Conflux-Rust also brought support for fullstate query, which means we can query state at any blockchain height. For example we can query an address cfx:aaketjh9tkj5g2k4zx3kfvb9vkku8nr956n0en4fhe's balance at height 100000 with method cfx_getBalance by specifying the second parameter.

curl --location --request POST 'https://main.confluxrpc.com' \
--header 'Content-Type: application/json' \
--data-raw ' {
    "jsonrpc": "2.0",
    "id": "15922956697249514502",
    "method": "cfx_getBalance",
    "params": [
        "cfx:aaketjh9tkj5g2k4zx3kfvb9vkku8nr956n0en4fhe",
        "0x186a0"
    ]
  }'

To support conflux fullstate query, a archive node with configuration enable_single_mpt_storage enabled is required. And the node need sync data from genesis to construct all the history states. Besides nodes can also set single_mpt_space = "evm" to only store eSpace states.

RPC#

Support eth_subscribe and eth_unsubscribe in eSpace RPCs.
Add a RPC method cfx_getParamsFromVote to return the currently used value of the voted parameters.
Return null for getting skipped transactions and receipts. Whether they will be returned was nondeterministic before, but now they are ensured to be null.

Update schedule#

Mainnet#

v2.1.0 hardfork epochNumber has been set to 56800000 (estimated on Oct. 18th, 2022 (GMT+8))
CIP-94 activate blockNumber is 133800000 (estimated on Oct. 25th, 2022 (GMT+8))
CIP-99 activate PoS blockNumber is 330000 (estimated on Oct. 25th, 2022 (GMT+8))

Testnet#

v2.1.0 hardfork epochNumber has been set to 88100000 (around 22:00 Aug.17th, 2022(GMT+8))
CIP-94 activate blockNumber is 112400000
CIP-99 activate PoS blockNumber is 342000