ethereum

README

DxChain 3.0

The Ecosystem Powered by DxChain 3.0

Smart Contract Platform

While compatible with all smart contract functions on Ethereum (completely migrated to the DxChain Mainnet), we try to provide worldwide users with easy-to-use and templated development solutions to help popularize smart contracts and provide more diversified dapps.

Cross Chain

Under the premise of ensuring the absolute security of asset circulation, cross-chain circulation of assets with low handling fees, low latency and high concurrency can be completed through DxChain 3.0 on-chain transfer without any centralized platform. To achieve the circulation and exchange of tokens by connecting mainstream projects and building a global asset interactive network.

DeFi

We are committed to building a more convenient, friendly, and safer decentralized financial service platform for worldwide users to transfer crypto assets easily and transparently. In the meantime, it will also provide our ecosystem partners with appropriate and feasible financial products and services, including but not limited to mainstream DeFi applications such as DEX, loans, and liquidity mining to meet the diverse financial needs.

NFT

Currently, the Non-Fungible Token (NFT) can be used in crypto-collectibles, games and other applications. DxChain will help creators, developers, and collectors to perform NFT minting, development, and trading more conveniently and stably, providing the industry with integrative solutions.

Metaverse

As a bridge between the real world and the virtual world, Metaverse will further affect social, entertainment, finance and other aspects in the future. In this regard, DxChain will join this market in advance, conduct a forward-looking exploration regarding cross-chain identification, social entertainment, integration of crypto and tangible assets, GameFi, etc.

DxChain 3.0 Architecture

Fully Compatible with EVM

DxChain 3.0 is fully compatible with Ethereum Virtual Machine (EVM), supports the compilation and execution of smart contracts, and supports various versions of Solidity. The Ethereum Virtual Machine is a Turing-complete state machine, an engine used to execute transactions or contract code. EVM provides a secure operating environment for each contract with an independent runtime stack, which contains a maximum of 1024 elements, and each element is 256bit. Moreover, EVM supports cyclic operation instructions and the contract supports complex logic functions, enabling any complex conceived programs to run smoothly.

DPoS Consensus

The DxChain mainnet currently implements the DPoS (Delegated Proof of Stake) algorithm, which is considered an improved version of the PoS (Proof of Stake) algorithm and has the characteristics of democratization, low costs, low latency, and high concurrency. DxChain 3.0 improves the DPoS consensus algorithm by storing the staking and voting data in the built-in contract and keeps the data storage structure consistent with the state trie, allowing more efficient elections and block synchronization.

• TPS: 500+
• Average block interval: 3s
• Validators: <=99
• Delegators: <=210

The system contracts code here: consensus/dpos/systemcontract/contracts

Cross Chain

DxChain Bridge uses AWS Nitro Enclave to build a fast, safe, and low-cost cross-chain bridge between Ethereum and DxChain. The DxBridge will be composed of Nitro Enclave and a list of trusted nodes (called Warden). Nitro Enclave will be used to build an isolated execution environment to prevent any centralized interference and reduce the complex steps without sacrificing system security.

DxBridge mainly consists of two parts:

• Nitro Enclave: AWS Trusted Execution Environment solution. By creating an isolated environment, users can use and process private keys with high security while preventing users and applications on the parent instance to views or obtaining those information.
• A set of Wardens: third-party searchers and verifiers of transactions. Warden is mainly responsible for retrieving DxChain and Ethereum and submitting legal transactions that need to be processed to Nitro Enclave. First, Warden will look for transactions that have been successfully sent to the Ethereum wallet or transactions that have been retrieved from DxChain. There must be enough funds to pay for related expenses, including the gas fee and cross-chain fees required, otherwise, the transaction will be rejected and Warden will not retrieve these transactions. Nitro Enclave requires a certain number of Wardens to submit the same transaction at the same time, then the bridge will send the corresponding transaction on another chain and submit legal transactions by providing a private key segment.

Nitro Enclave can directly connect with Warden to obtain on-chain events and send transactions. The private keys of all addresses in the transaction are derived from the master private key generated during initialization that no other party can obtain. The master private key uses the Shamir Secret Sharing algorithm to distribute the private key segments to Warden, and uses TLS communication to verify the identity during the process. Nitro Enclave will ask Warden for private key segments via TLS connection to retrieve the master private key, and distribute new private key segments to Warden again after restart. In addition, transactions confirmed to have been processed by the bridge will be backed up locally.

Tokenomic

The native token on the DxChain is DX, an exchange unit between users, provides economic incentives for on-chain activities and is also consumed as handling fees. The total supply of DX is 100 billion, of which the ecosystem pool is 45 billion. The undistributed rewards for DxChain 2.0 will continue to be distributed in DxChain 3.0.

Users can participate in DxChain by voting DX to obtain block rewards or become a Validator to maintain the security and stability of the DxChain network. In DxChain 3.0, there is also a new token burn mechanism. If a Validator does not meet the required number of block generation in a certain epoch, all block rewards that have been generated will be burned and the Validator status will be canceled.

Governance

DxChain mainly divides business, technology, and community aspects in community governance. It is expected that major decisions and policies will be governed by community voting. The community initiates proposals, evaluates the results, and the committee monitors the execution process so that the DxChain development team and the community can realize the co-governance.

The DxChain team always firmly believes that a fair, reasonable, and transparent governance mechanism with multi-party participation can better improve the community's quality. DxChain will adhere to the following points:

• Improve the community incentive mechanism We will continue to run DPoS mining, keep the incentive mechanism updated and innovated, provide sufficient incentives to attract more users and achieve positive feedback, aiming to guarantee the benefits of all users.

• Community Co-governance Co-governance will be the core idea of DxChain 3.0 community governance. In order to increase the sense of ownership, community users will be advocated and guided to participate in community discussions, proposals, and voting in the design of the community governance mechanism.

• Foundation Assistance As the initiator of DxChain ecosystem, DX Foundation will play the role of mobilizing community participation, accelerating community merging, integrating community resources, solving community problems, and promoting community governance.

Election

The validator is responsible for block generation and verification on the chain, and is an integral part of DxChain. In order to realize co-governance, the rules were firstly applied in node elections. If a user wants to participate in the DPoS and apply for a validator, the following conditions must be met:

• Possess the technical and hardware requirements to maintain a blockchain node
• Stake at least 40 million DX
• The proportion allocated to voters is between 70% and 100% A proposal will be initiated on DxChain once the above conditions are met and all existing delegators can vote, the application will not get approved until at least one validator has voted.

DAO

DAO (Decentralized Autonomous Organization) involves on-chain governance. Project or community users can initiate proposals, such as adjustments to consensus algorithm and economic models, deciding whether to approve new delegators, greatly expressing our idea of co-governance and reducing the risks brought by centralized governance.

Foundation

Currently, 5% of the block reward will be allocated to the DxChain Foundation to support future development and operation, community governance, external developer contribution rewards, ecosystem construction funds, etc. (including but not limited to Dapp Development and marketing). Community governance is a process in which delegators, community members and foundations supervise each other and work together. The DxChain team will continue to improve the further governance plan in DxChain 3.0 to make governance and supervision more transparent.

Private Chain Construction Guide

Pull dxc from GitHub

git clone https://github.com/DxChainNetwork/dxc.git

Install Golang

https://golang.org/doc/install

Compile

cd /path/to/dxc		# path to the dxc project
make geth

The compiled geth executable file is under the /path/to/dxc/build/bin path.

Create new account

1. Create data directory

mkdir -p build/bin/data	# customized data path

1. New account

./build/bin/geth account new --datadir ./build/bin/data
echo "your-password" > build/bin/password.txt

Create genesis block

1. Creategenesis.json under build/bin directory, and modify the alloc field to desired balance for genesis block.
2. Replace 1c0e8eaf42ec8d4010e960313248d2af95be7d34 from extraData field with initial address (without 0x prefix).

{
  "config": {
    "chainId": 36,
    "homesteadBlock": 0,
    "eip150Block": 0,
    "eip150Hash": "0x0000000000000000000000000000000000000000000000000000000000000000",
    "eip155Block": 0,
    "eip158Block": 0,
    "byzantiumBlock": 0,
    "constantinopleBlock": 0,
    "petersburgBlock": 0,
    "istanbulBlock": 0,
    "muirGlacierBlock": 0,
    "dpos": {
      "period": 3,
      "epoch": 28800
    }
  },
  "nonce": "0x0",
  "timestamp": "0x5fc58968",
  "extraData": "0x00000000000000000000000000000000000000000000000000000000000000001c0e8eaf42ec8d4010e960313248d2af95be7d340000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
  "gasLimit": "0x280de80",
  "difficulty": "0x1",
  "alloc": {
    "0x0000000000000000000000000000000000fff001": {
      "balance": "0x0",
      "code": 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    },
    "initialize validator account": {
      "balance": "0x14adf4b7320335000000000"
    }
  },
  "number": "0x0",
  "gasUsed": "0x0",
  "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000"
}

1. Modify the InitValAddress in consensus/dpos/systemcontract/initialize_config.go

// using for Validators contract's initialize
var (
	InitValAddress = common.HexToAddress("initialize validator account")
	InitRate       = uint8(70)
	InitDeposit    = new(big.Int).Mul(big.NewInt(1e18), big.NewInt(1))
)

Re-compile

cd /path/to/dxc
make geth

The compiled geth executable file is under the /path/to/dxc/build/bin path.

Create genesis block

./build/bin/geth --datadir ./build/bin/data init ./build/bin/genesis.json

Run

./build/bin/geth --datadir ./build/bin/data --allow-insecure-unlock --unlock "initialize validator"  --password ./build/bin/password.txt --mine --syncmode full --gcmode archive --verbosity 3 2>&1 | tee ./build/bin/data/system.log

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Documentation

Overview

Package ethereum defines interfaces for interacting with Ethereum.

Index

• Variables
• type CallMsg
• type ChainReader
• type ChainStateReader
• type ChainSyncReader
• type ContractCaller
• type FilterQuery
• type GasEstimator
• type GasPricer
• type LogFilterer
• type PendingContractCaller
• type PendingStateEventer
• type PendingStateReader
• type Subscription
• type SyncProgress
• type TransactionReader
• type TransactionSender

Variables

var NotFound = errors.New("not found")

NotFound is returned by API methods if the requested item does not exist.

Types

type CallMsg

type CallMsg struct {
	From      common.Address  // the sender of the 'transaction'
	To        *common.Address // the destination contract (nil for contract creation)
	Gas       uint64          // if 0, the call executes with near-infinite gas
	GasPrice  *big.Int        // wei <-> gas exchange ratio
	GasFeeCap *big.Int        // EIP-1559 fee cap per gas.
	GasTipCap *big.Int        // EIP-1559 tip per gas.
	Value     *big.Int        // amount of wei sent along with the call
	Data      []byte          // input data, usually an ABI-encoded contract method invocation

	AccessList types.AccessList // EIP-2930 access list.
}

CallMsg contains parameters for contract calls.

type ChainReader

type ChainReader interface {
	BlockByHash(ctx context.Context, hash common.Hash) (*types.Block, error)
	BlockByNumber(ctx context.Context, number *big.Int) (*types.Block, error)
	HeaderByHash(ctx context.Context, hash common.Hash) (*types.Header, error)
	HeaderByNumber(ctx context.Context, number *big.Int) (*types.Header, error)
	TransactionCount(ctx context.Context, blockHash common.Hash) (uint, error)
	TransactionInBlock(ctx context.Context, blockHash common.Hash, index uint) (*types.Transaction, error)

	// This method subscribes to notifications about changes of the head block of
	// the canonical chain.
	SubscribeNewHead(ctx context.Context, ch chan<- *types.Header) (Subscription, error)
}

ChainReader provides access to the blockchain. The methods in this interface access raw data from either the canonical chain (when requesting by block number) or any blockchain fork that was previously downloaded and processed by the node. The block number argument can be nil to select the latest canonical block. Reading block headers should be preferred over full blocks whenever possible.

The returned error is NotFound if the requested item does not exist.

type ChainStateReader

type ChainStateReader interface {
	BalanceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (*big.Int, error)
	StorageAt(ctx context.Context, account common.Address, key common.Hash, blockNumber *big.Int) ([]byte, error)
	CodeAt(ctx context.Context, account common.Address, blockNumber *big.Int) ([]byte, error)
	NonceAt(ctx context.Context, account common.Address, blockNumber *big.Int) (uint64, error)
}

ChainStateReader wraps access to the state trie of the canonical blockchain. Note that implementations of the interface may be unable to return state values for old blocks. In many cases, using CallContract can be preferable to reading raw contract storage.

type ChainSyncReader

type ChainSyncReader interface {
	SyncProgress(ctx context.Context) (*SyncProgress, error)
}

ChainSyncReader wraps access to the node's current sync status. If there's no sync currently running, it returns nil.

type ContractCaller

type ContractCaller interface {
	CallContract(ctx context.Context, call CallMsg, blockNumber *big.Int) ([]byte, error)
}

A ContractCaller provides contract calls, essentially transactions that are executed by the EVM but not mined into the blockchain. ContractCall is a low-level method to execute such calls. For applications which are structured around specific contracts, the abigen tool provides a nicer, properly typed way to perform calls.

type FilterQuery

type FilterQuery struct {
	BlockHash *common.Hash     // used by eth_getLogs, return logs only from block with this hash
	FromBlock *big.Int         // beginning of the queried range, nil means genesis block
	ToBlock   *big.Int         // end of the range, nil means latest block
	Addresses []common.Address // restricts matches to events created by specific contracts

	// The Topic list restricts matches to particular event topics. Each event has a list
	// of topics. Topics matches a prefix of that list. An empty element slice matches any
	// topic. Non-empty elements represent an alternative that matches any of the
	// contained topics.
	//
	// Examples:
	// {} or nil          matches any topic list
	// {{A}}              matches topic A in first position
	// {{}, {B}}          matches any topic in first position AND B in second position
	// {{A}, {B}}         matches topic A in first position AND B in second position
	// {{A, B}, {C, D}}   matches topic (A OR B) in first position AND (C OR D) in second position
	Topics [][]common.Hash
}

FilterQuery contains options for contract log filtering.

type GasEstimator

type GasEstimator interface {
	EstimateGas(ctx context.Context, call CallMsg) (uint64, error)
}

GasEstimator wraps EstimateGas, which tries to estimate the gas needed to execute a specific transaction based on the pending state. There is no guarantee that this is the true gas limit requirement as other transactions may be added or removed by miners, but it should provide a basis for setting a reasonable default.

type GasPricer

type GasPricer interface {
	SuggestGasPrice(ctx context.Context) (*big.Int, error)
}

GasPricer wraps the gas price oracle, which monitors the blockchain to determine the optimal gas price given current fee market conditions.

type LogFilterer

type LogFilterer interface {
	FilterLogs(ctx context.Context, q FilterQuery) ([]types.Log, error)
	SubscribeFilterLogs(ctx context.Context, q FilterQuery, ch chan<- types.Log) (Subscription, error)
}

LogFilterer provides access to contract log events using a one-off query or continuous event subscription.

Logs received through a streaming query subscription may have Removed set to true, indicating that the log was reverted due to a chain reorganisation.

type PendingContractCaller

type PendingContractCaller interface {
	PendingCallContract(ctx context.Context, call CallMsg) ([]byte, error)
}

PendingContractCaller can be used to perform calls against the pending state.

type PendingStateEventer

type PendingStateEventer interface {
	SubscribePendingTransactions(ctx context.Context, ch chan<- *types.Transaction) (Subscription, error)
}

A PendingStateEventer provides access to real time notifications about changes to the pending state.

type PendingStateReader

type PendingStateReader interface {
	PendingBalanceAt(ctx context.Context, account common.Address) (*big.Int, error)
	PendingStorageAt(ctx context.Context, account common.Address, key common.Hash) ([]byte, error)
	PendingCodeAt(ctx context.Context, account common.Address) ([]byte, error)
	PendingNonceAt(ctx context.Context, account common.Address) (uint64, error)
	PendingTransactionCount(ctx context.Context) (uint, error)
}

A PendingStateReader provides access to the pending state, which is the result of all known executable transactions which have not yet been included in the blockchain. It is commonly used to display the result of ’unconfirmed’ actions (e.g. wallet value transfers) initiated by the user. The PendingNonceAt operation is a good way to retrieve the next available transaction nonce for a specific account.

type Subscription

type Subscription interface {
	// Unsubscribe cancels the sending of events to the data channel
	// and closes the error channel.
	Unsubscribe()
	// Err returns the subscription error channel. The error channel receives
	// a value if there is an issue with the subscription (e.g. the network connection
	// delivering the events has been closed). Only one value will ever be sent.
	// The error channel is closed by Unsubscribe.
	Err() <-chan error
}

Subscription represents an event subscription where events are delivered on a data channel.

type SyncProgress

type SyncProgress struct {
	StartingBlock uint64 // Block number where sync began
	CurrentBlock  uint64 // Current block number where sync is at
	HighestBlock  uint64 // Highest alleged block number in the chain
	PulledStates  uint64 // Number of state trie entries already downloaded
	KnownStates   uint64 // Total number of state trie entries known about
}

SyncProgress gives progress indications when the node is synchronising with the Ethereum network.

type TransactionReader

type TransactionReader interface {
	// TransactionByHash checks the pool of pending transactions in addition to the
	// blockchain. The isPending return value indicates whether the transaction has been
	// mined yet. Note that the transaction may not be part of the canonical chain even if
	// it's not pending.
	TransactionByHash(ctx context.Context, txHash common.Hash) (tx *types.Transaction, isPending bool, err error)
	// TransactionReceipt returns the receipt of a mined transaction. Note that the
	// transaction may not be included in the current canonical chain even if a receipt
	// exists.
	TransactionReceipt(ctx context.Context, txHash common.Hash) (*types.Receipt, error)
}

TransactionReader provides access to past transactions and their receipts. Implementations may impose arbitrary restrictions on the transactions and receipts that can be retrieved. Historic transactions may not be available.

Avoid relying on this interface if possible. Contract logs (through the LogFilterer interface) are more reliable and usually safer in the presence of chain reorganisations.

The returned error is NotFound if the requested item does not exist.

type TransactionSender

type TransactionSender interface {
	SendTransaction(ctx context.Context, tx *types.Transaction) error
}

TransactionSender wraps transaction sending. The SendTransaction method injects a signed transaction into the pending transaction pool for execution. If the transaction was a contract creation, the TransactionReceipt method can be used to retrieve the contract address after the transaction has been mined.

The transaction must be signed and have a valid nonce to be included. Consumers of the API can use package accounts to maintain local private keys and need can retrieve the next available nonce using PendingNonceAt.