// Step 4: Staker delegates to an operator
// Operators run AVS validation software
function delegateTo(
    address operator,
    SignatureWithExpiry memory stakerSignatureAndExpiry,
    bytes32 approverSignatureAndExpiry
) external {
    require(isOperator(operator), "Operator not registered");
    delegationManager.delegateTo(
        operator, 
        stakerSignatureAndExpiry, 
        approverSignatureAndExpiry
    );
}

// Step 5: Operator opts into AVS slashing conditions
// AVS contracts define custom validation and slashing logic
interface IAVSRegistry {
    function registerOperatorToAVS(
        address operator,
        bytes32 salt,
        uint256 expiry,
        bytes memory signature
    ) external;
}

// Operator opts into EigenDA AVS
function optInToEigenDA(bytes memory blsPublicKey) external {
    eigenDARegistry.registerOperatorToAVS(
        msg.sender,
        keccak256(abi.encodePacked(block.timestamp)),
        block.timestamp + 7 days,
        blsSignature
    );
}

// EigenDA disperser client - dispersing a blob to EigenDA
package main

import (
    "context"
    "fmt"
    "time"

    disperser "github.com/Layr-Labs/eigenda/api/grpc/disperser"
    "google.golang.org/grpc"
    "google.golang.org/grpc/credentials/insecure"
)

func disperseBlob(data []byte) (*disperser.BlobStatus, error) {
    conn, err := grpc.Dial("disperser.eigenda.io:443", 
        grpc.WithTransportCredentials(insecure.NewCredentials()))
    if err != nil {
        return nil, err
    }
    defer conn.Close()

    client := disperser.NewDisperserClient(conn)
    ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
    defer cancel()

    // Disperse blob with custom security parameters
    reply, err := client.DisperseBlob(ctx, &disperser.DisperseBlobRequest{
        Data: data,
        SecurityParams: []*disperser.SecurityParam{
            {
                QuorumId: 0,
                AdversaryThreshold: 25,
                QuorumThreshold: 50,
            },
        },
    })
    if err != nil {
        return nil, fmt.Errorf("disperse failed: %w", err)
    }

    return reply.GetResult(), nil
}

# EigenDA retrieval client - verifying blob availability
import asyncio
import grpc
from eigenda.api import retriever_pb2, retriever_pb2_grpc

async def retrieve_blob(batch_header_hash bytes, blob_index int): async with grpc.aio.insecure_channel('retriever.eigenda.io:443') as channel: stub = retriever_pb2_grpc.RetrieverStub(channel)
        
        request = retriever_pb2.RetrieveBlobRequest(
            batch_header_hash=batch_header_hash,
            blob_index=blob_index
        )
        
        response = await stub.RetrieveBlob(request)
        
        # Verify the blob against the claimed commitment
        assert verify_kzg_proof(response.blob, response.kzg_proof), \
            "KZG proof verification failed"
        
        return response.blob

# Required tools
node --version  # >= 18.0.0
foundry --version  # Forge 0.2.0+
go version  # >= 1.21

# Clone EigenLayer middleware and contracts
git clone https://github.com/Layr-Labs/eigenlayer-contracts.git
git clone https://github.com/Layr-Labs/eigenlayer-middleware.git
cd eigenlayer-middleware && forge install && cd ..

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "@eigenlayer-middleware/BLSSignatureChecker.sol";
import "@eigenlayer-middleware/OperatorStateRetriever.sol";
import "./IPriceOracleAVS.sol";

contract PriceOracleAVS is BLSSignatureChecker, OperatorStateRetriever {
    
    // Price data submitted by operators
    struct PriceResponse {
        uint256 price;
        uint32 blockNumber;
        BN254.G1Point signature;
        BN254.G2Point pubkeyG2;
    }
    
    // Aggregated price with quorum metadata
    struct AggregatedPriceUpdate {
        uint256 aggregatedPrice;
        uint32 quorumBlockNumber;
        bytes metadata;
    }
    
    // Track latest confirmed prices per asset
    mapping(bytes32 => AggregatedPriceUpdate) public latestPrices;
    
    event PriceUpdated(
        bytes32 indexed assetId,
        uint256 price,
        uint32 quorumBlockNumber
    );
    
    // Restaking integration
    IStakeRegistry public immutable stakeRegistry;
    IRegistryCoordinator public immutable registryCoordinator;
    
    constructor(
        address _stakeRegistry,
        address _registryCoordinator,
        address _blsSignatureChecker
    ) BLSSignatureChecker(_blsSignatureChecker) {
        stakeRegistry = IStakeRegistry(_stakeRegistry);
        registryRegistryCoordinator = IRegistryCoordinator(_registryCoordinator);
    }
    
    /// @notice Submit aggregated price response with BLS quorum certificate
    function confirmPriceUpdate(
        bytes32 assetId,
        uint256 proposedPrice,
        QuorumStakeTotals memory quorumStakeTotals,
        bytes32 apkHash,
        BN254.G1Point memory quorumApkIndices,
        BN254.G2Point memory nonSignerStakesAndSignature
    ) external {
        // Verify BLS quorum signature
        require(
            checkSignatures(
                keccak256(abi.encodePacked(assetId, proposedPrice)),
                quorumStakeTotals,
                apkHash,
                quorumApkIndices,
                nonSignerStakesAndSignature
            ),
            "Quorum verification failed"
        );
        
        // Store aggregated price
        latestPrices[assetId] = AggregatedPriceUpdate({
            aggregatedPrice: proposedPrice,
            quorumBlockNumber: uint32(block.number),
            metadata: abi.encode(quorumStakeTotals)
        });
        
        emit PriceUpdated(assetId, proposedPrice, uint32(block.number));
    }
}

// operator/price_task_generator.go
package operator

import (
    "context"
    "crypto/sha256"
    "encoding/json"
    "fmt"
    "math/big"
    "time"

    "github.com/Layr-Labs/eigensdk-go/chainio/clients"
    "github.com/Layr-Labs/eigensdk-go/crypto/bls"
    "github.com/Layr-Labs/eigensdk-go/logging"
)

type PriceTaskGenerator struct {
    logger            logging.Logger
    ethClient         *clients.EthereumClient
    blsKeypair        *bls.KeyPair
    priceOracleAVS    *PriceOracleAVSClient
    aggregatorRpcUrl  string
}

func NewPriceTaskGenerator(
    logger logging.Logger,
    ethClient *clients.EthereumClient,
    blsKeypair *bls.KeyPair,
    aggregatorRpcUrl string,
) *PriceTaskGenerator {
    return &PriceTaskGenerator{
        logger: logger,
        ethClient: ethClient,
        blsKeypair: blsKeypair,
        aggregatorRpcUrl: aggregatorRpcUrl,
    }
}

// Generate and sign price response for a given task
func (g *PriceTaskGenerator) ProcessNewTask(
    ctx context.Context,
    task PriceOracleTask,
) (*SignedPriceResponse, error) {
    
    // Fetch price from multiple CEX/DEX sources
    price, err := g.fetchAggregatedPrice(ctx, task.AssetId)
    if err != nil {
        return nil, fmt.Errorf("fetch price failed: %w", err)
    }
    
    // Construct response digest
    responseDigest := g.calculateResponseDigest(task, price)
    
    // Sign with BLS12-381 keypair
    signature := g.blsKeypair.Sign(responseDigest)
    
    signedResponse := &SignedPriceResponse{
        TaskId: task.TaskId,
        AssetId: task.AssetId,
        Price: price,
        BlockNumber: task.CreationBlockNumber,
        Signature: signature,
        PubkeyG1: g.blsKeypair.GetPubKeyG1(),
        PubkeyG2: g.blsKeypair.GetPubKeyG2(),
    }
    
    g.logger.Info("Signed price response",
        "asset", task.AssetId,
        "price", price,
        "taskId", task.TaskId,
    )
    
    return signedResponse, nil
}

// fetchAggregatedPrice queries multiple sources and returns median
func (g *PriceTaskGenerator) fetchAggregatedPrice(
    ctx context.Context,
    assetId string,
) (*big.Int, error) {
    sources := []PriceSource{
        NewBinanceSource(),
        NewCoinbaseSource(),
        NewChainlinkSource(),
    }
    
    var prices []*big.Int
    for _, source := range sources {
        price, err := source.GetPrice(ctx, assetId)
        if err != nil {
            g.logger.Warn("Price source failed", "source", source.Name(), "err", err)
            continue
        }
        prices = append(prices, price)
    }
    
    if len(prices) < 2 {
        return nil, fmt.Errorf("insufficient price sources: got %d, need 2+", len(prices))
    }
    
    return calculateMedian(prices), nil
}

func (g *PriceTaskGenerator) calculateResponseDigest(
    task PriceOracleTask,
    price *big.Int,
) [32]byte {
    data := fmt.Sprintf("%s%s%s%d",
        task.AssetId,
        price.String(),
        g.ethClient.GetAccountAddress().Hex(),
        task.CreationBlockNumber,
    )
    return sha256.Sum256([]byte(data))
}

// aggregator/aggregator.go
package aggregator

import (
    "context"
    "fmt"
    "sync"
    
    "github.com/Layr-Labs/eigensdk-go/logging"
    "github.com/Layr-Labs/eigensdk-go/types"
)

// Aggregator collects signed responses and builds quorum certificates
type PriceAggregator struct {
    logger           logging.Logger
    avsRegistry      AVSRegistryReader
    priceOracleAVS   *PriceOracleAVSContract
    
    // Task tracking
    tasks        map[uint32]*TaskState
    tasksMu      sync.RWMutex
    
    // Quorum configuration
    quorumThresholdPercentage uint32
    aggregatePubkeyTimeout    int64
}

type TaskState struct {
    Task              PriceOracleTask
    Responses         map[types.Bytes32]*SignedPriceResponse
    AggregatedResponses map[uint8]*AggregatedPriceResponse
    Status            TaskStatus
}

func (a *PriceAggregator) ProcessSignedPriceResponse(
    response *SignedPriceResponse,
) error {
    a.tasksMu.Lock()
    defer a.tasksMu.Unlock()
    
    taskState, exists := a.tasks[response.TaskId]
    if !exists {
        return fmt.Errorf("task %d not found", response.TaskId)
    }
    
    if taskState.Status != TaskStatusPending {
        return fmt.Errorf("task %d already processed", response.TaskId)
    }
    
    // Verify operator is registered and staked
    operatorStake, err := a.avsRegistry.GetOperatorStake(
        response.PubkeyG1,
        response.TaskId,
    )
    if err != nil {
        return fmt.Errorf("stake check failed: %w", err)
    }
    
    if operatorStake.IsZero() {
        return fmt.Errorf("operator has no stake")
    }
    
    // Store response
    responseKey := types.Bytes32(response.Signature.Hash())
    taskState.Responses[responseKey] = response
    
    a.logger.Info("Received signed response",
        "taskId", response.TaskId,
        "operator", response.PubkeyG1.String()[:20],
    )
    
    // Attempt aggregation
    return a.tryAggregateResponses(taskState)
}

func (a *PriceAggregator) tryAggregateResponses(state *TaskState) error {
    // Group responses by price value (within tolerance)
    priceGroups := make(map[string][]*SignedPriceResponse)
    for _, resp := range state.Responses {
        key := resp.Price.String()
        priceGroups[key] = append(priceGroups[key], resp)
    }
    
    // Find group with sufficient stake
    for _, group := range priceGroups {
        totalStake := big.NewInt(0)
        var signatures []bls.Signature
        var pubkeysG1 []bls.G1Point
        var pubkeysG2 []bls.G2Point
        
        for _, resp := range group {
            stake, _ := a.avsRegistry.GetOperatorStake(resp.PubkeyG1, state.Task.TaskId)
            totalStake.Add(totalStake, stake)
            signatures = append(signatures, resp.Signature)
            pubkeysG1 = append(pubkeysG1, resp.PubkeyG1)
            pubkeysG2 = append(pubkeysG2, resp.PubkeyG2)
        }
        
        // Check if quorum reached
        quorumStake, err := a.avsRegistry.GetQuorumStake(state.Task.TaskId)
        if err != nil {
            continue
        }
        
        threshold := new(big.Int).Mul(quorumStake, big.NewInt(int64(a.quorumThresholdPercentage)))
        threshold.Div(threshold, big.NewInt(100))
        
        if totalStake.Cmp(threshold) >= 0 {
            // Aggregate BLS signatures
            aggSig := bls.AggregateSignatures(signatures)
            aggPubkeyG1 := bls.AggregatePubkeysG1(pubkeysG1)
            
            // Send to chain
            return a.sendAggregatedResponse(state.Task, group[0].Price, aggSig, aggPubkeyG1, pubkeysG2)
        }
    }
    
    return nil // Not enough quorum yet
}

#!/bin/bash
# deploy_avs.sh - Deploy PriceOracle AVS to mainnet

set -e

# Configuration
export PRIVATE_KEY=${PRIVATE_KEY:?"PRIVATE_KEY required"}
export RPC_URL=${RPC_URL:-"https://eth-mainnet.g.alchemy.com/v2/$ALCHEMY_KEY"}
export EIGENLAYER_DEPLOYMENT=$(cat eigenlayer_deployment_block.json)

# Deploy registry contracts
echo "=== Deploying Registry Coordinator ==="
forge script script/DeployPriceOracleAVS.s.sol:DeployRegistry \
    --rpc-url $RPC_URL \
    --private-key $PRIVATE_KEY \
    --broadcast \
    --verify \
    -vvvv

REGISTRY_COORDINATOR=$(cat broadcast/DeployPriceOracleAVS.s.sol/1/run-latest.json | jq -r '.transactions[0].contractAddress')

# Deploy stake registry
echo "=== Deploying Stake Registry ==="
forge script script/DeployPriceOracleAVS.s.sol:DeployStakeRegistry \
    --rpc-url $RPC_URL \
    --private-key $PRIVATE_KEY \
    --broadcast \
    --verify \
    --sig "run(address)" $REGISTRY_COORDINATOR

STAKE_REGISTRY=$(cat broadcast/DeployPriceOracleAVS.s.sol/1/run-latest.json | jq -r '.transactions[0].contractAddress')

# Deploy main AVS contract
echo "=== Deploying PriceOracle AVS ==="
forge script script/DeployPriceOracleAVS.s.sol:DeployAVS \
    --rpc-url $RPC_URL \
    --private-key $PRIVATE_KEY \
    --broadcast \
    --verify \
    --sig "run(address,address)" $STAKE_REGISTRY $REGISTRY_COORDINATOR

AVS_CONTRACT=$(cat broadcast/DeployPriceOracleAVS.s.sol/1/run-latest.json | jq -r '.transactions[0].contractAddress')

echo "=== Deployment Complete ==="
echo "Registry Coordinator: $REGISTRY_COORDINATOR"
echo "Stake Registry: $STAKE_REGISTRY"
echo "PriceOracle AVS: $AVS_CONTRACT"

// script/DeployPriceOracleAVS.s.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

import "forge-std/Script.sol";
import "../src/PriceOracleAVS.sol";

contract DeployRegistry is Script {
    function run() external {
        vm.startBroadcast();
        
        RegistryCoordinator registryCoordinator = new RegistryCoordinator(
            IStakeRegistry(address(0)), // Will be updated
            IBLSApkRegistry(address(0)), // Will be updated
            IIndexRegistry(address(0)),  // Will be updated
            ISocketRegistry(address(0))  // Will be updated
        );
        
        vm.stopBroadcast();
        
        console.log("RegistryCoordinator deployed at:", address(registryCoordinator));
    }
}

contract DeployStakeRegistry is Script {
    function run(address registryCoordinator) external {
        vm.startBroadcast();
        
        StakeRegistry stakeRegistry = new StakeRegistry(
            IRegistryCoordinator(registryCoordinator),
            IDelegationManager(EIGENLAYER_DELEGATION_MANAGER)
        );
        
        vm.stopBroadcast();
        
        console.log("StakeRegistry deployed at:", address(stakeRegistry));
    }
}

contract DeployAVS is Script {
    function run(address stakeRegistry, address registryCoordinator) external {
        vm.startBroadcast();
        
        PriceOracleAVS priceOracleAVS = new PriceOracleAVS(
            stakeRegistry,
            registryCoordinator,
            EIGENLAYER_BLS_SIGNATURE_CHECKER
        );
        
        vm.stopBroadcast();
        
        console.log("PriceOracleAVS deployed at:", address(priceOracleAVS));
    }
}

// Custom slashing condition for PriceOracle AVS
interface ISlasher {
    function freezeOperator(address operator) external;
    function resetFrozenStatus(address operator) external;
}

contract PriceOracleSlashing {
    
    struct SlashingRecord {
        bytes32 reason;
        uint32 blockNumber;
        uint256 stakeAmount;
    }
    
    mapping(address => SlashingRecord[]) public slashingHistory;
    
    // Slash conditions: // 1. Signing divergent prices for the same task
    // 2. Failing to respond within response window
    // 3. Signing prices beyond deviation threshold
    
    function slashDivergentResponse(
        address operator,
        PriceResponse memory response1,
        PriceResponse memory response2,
        BN254.G1Point memory signature1,
        BN254.G1Point memory signature2
    ) external {
        require(
            verifyDoubleSigning(response1, response2, signature1, signature2),
            "Not a valid double signing event"
        );
        
        // Calculate slash amount (100% of AVS-specific stake)
        uint256 slashAmount = getAVSStake(operator);
        
        // Record slashing
        slashingHistory[operator].push(SlashingRecord({
            reason: keccak256("DIVERGENT_RESPONSE"),
            blockNumber: uint32(block.number),
            stakeAmount: slashAmount
        }));
        
        // Execute slash through EigenLayer
        delegationManager.queueWithdrawals(
            operator,
            strategies,
            shares // reduced by slash amount
        );
        
        emit OperatorSlashed(operator, slashAmount, "DIVERGENT_RESPONSE");
    }
}

// Monitoring operator health and detecting slashable events
package monitoring

import (
    "context"
    "math/big"
    "time"
)

type SlashMonitor struct {
    ethClient       *ethclient.Client
    avsContract     *PriceOracleAVS
    alertWebhook    string
}

func (m *SlashMonitor) StartMonitoring(ctx context.Context) {
    ticker := time.NewTicker(12 * time.Second) // Ethereum block time
    defer ticker.Stop()
    
    for {
        select {
        case <-ctx.Done(): return
        case <-ticker.C: m.checkForSlashableEvents(ctx)
        }
    }
}

func (m *SlashMonitor) checkForSlashableEvents(ctx context.Context) {
    // Check for price deviations > 5% from median
    latestTasks, _ := m.avsContract.GetPendingTasks(nil)
    
    for _, task := range latestTasks {
        responses, _ := m.avsContract.GetTaskResponses(nil, task.TaskId)
        
        medianPrice := calculateMedianPrice(responses)
        
        for _, resp := range responses {
            deviation := new(big.Float).Quo(
                new(big.Float).Sub(resp.Price, medianPrice),
                medianPrice,
            )
            deviation.Abs(deviation)
            
            threshold := big.NewFloat(0.05) // 5% threshold
            if deviation.Cmp(threshold) > 0 {
                m.sendAlert("PRICE_DEVIATION", resp.Operator, task, resp.Price)
            }
        }
    }
}

// Rewards distribution contract for PriceOracle AVS
contract PriceOracleRewards is IRewardsCoordinator {
    
    using SafeERC20 for IERC20;
    
    IERC20 public rewardToken;
    uint256 public rewardsPerBlock;
    
    struct OperatorRewardInfo {
        uint256 accumulatedRewards;
        uint256 lastUpdateBlock;
        uint256 tasksCompleted;
    }
    
    mapping(address => OperatorRewardInfo) public operatorRewards;
    
    event RewardsClaimed(address indexed operator, uint256 amount);
    event RewardsDistributed(uint256 totalAmount, uint256 blockNumber);
    
    function distributeRewards(
        uint32 taskId,
        address[] calldata participatingOperators,
        uint256[] calldata performanceScores
    ) external onlyOwner {
        require(
            participatingOperators.length == performanceScores.length,
            "Length mismatch"
        );
        
        uint256 totalScore = 0;
        for (uint i = 0; i < performanceScores.length; i++) {
            totalScore += performanceScores[i];
        }
        
        uint256 totalReward = rewardsPerBlock * TASK_BLOCK_WINDOW;
        
        for (uint i = 0; i < participatingOperators.length; i++) {
            uint256 operatorShare = (totalReward * performanceScores[i]) / totalScore;
            
            OperatorRewardInfo storage info = operatorRewards[participatingOperators[i]];
            info.accumulatedRewards += operatorShare;
            info.lastUpdateBlock = uint32(block.number);
            info.tasksCompleted += 1;
        }
        
        emit RewardsDistributed(totalReward, block.number);
    }
    
    function claimRewards() external {
        OperatorRewardInfo storage info = operatorRewards[msg.sender];
        uint256 amount = info.accumulatedRewards;
        require(amount > 0, "No rewards to claim");
        
        info.accumulatedRewards = 0;
        rewardToken.safeTransfer(msg.sender, amount);
        
        emit RewardsClaimed(msg.sender, amount);
    }
}

// TypeScript SDK for LRT interactions
import { ethers, Contract } from ethers;
import { EigenLayerSDK } from '@eigenlayer/sdk';

const sdk = new EigenLayerSDK({
  provider: new ethers.JsonRpcProvider('https://eth-mainnet.g.alchemy.com/v2/YOUR_KEY'),
  network: mainnet
});

// Deposit stETH into Renzo (ezETH)
async function depositForLRT(stethAmount: bigint) {
  const renzo = await sdk.getLRTProtocol(renzo);
  
  const tx = await renzo.deposit({
    token: stETH,
    amount: stethAmount,
    receiver: walletAddress,
  });
  
  const receipt = await tx.wait();
  console.log(````Deposited ${stethAmount} stETH, received ezETH````);
  console.log(````Transaction: ${receipt.hash}````);
  
  // Query underlying AVS exposure
  const avsExposure = await renzo.getAVSExposure(walletAddress);
  console.log('AVS allocations:', avsExposure);
}

// Check rewards across all AVS positions
async function aggregateLRTYield() {
  const portfolio = await sdk.getLRTPortfolio(walletAddress);
  
  for (const position of portfolio.positions) {
    console.log(````\n${position.lrtSymbol}:````);
    console.log(````  Balance: ${position.balance}````);
    console.log(````  Underlying ETH: ${position.underlyingETH}````);
    console.log(````  30d Yield: ${position.thirtyDayYield}%````);
    console.log(````  AVS Exposure: ${position.avsAllocations.map(a => a.avsName).join(', ')}````);
  }
}

# 1. Set up development environment
git clone https://github.com/Layr-Labs/eigenlayer-contracts.git
cd eigenlayer-contracts && forge install

# 2. Configure environment
cp .env.example .env
# Edit .env with your RPC endpoint and private key

# 3. Run local testnet with EigenLayer contracts
anvil --fork-url $MAINNET_RPC --block-time 12
forge script script/DeployEigenLayer.s.sol --rpc-url http://localhost:8545 --broadcast

# 4. Deploy your AVS contracts
forge script script/DeployYourAVS.s.sol --rpc-url http://localhost:8545 --broadcast

# 5. Start operator node
cd operator/
go run main.go --config config.yaml

# 6. Monitor operations
make telemetry
# Opens Grafana dashboard at http://localhost:3000
````

* * *

*Disclaimer: This guide is for educational purposes only. Restaking involves significant smart contract risk, slashing risk, and protocol risk. Always conduct your own research before deploying capital or code. DYOR — Do Your Own Research.*

**Ready to start building on EigenLayer?** 
- Register on [Binance](https://www.bsmkweb.cc/register?ref=DIBI8) to acquire ETH for staking
- Explore automated AVS deployment with [Minara](https://minara.ai/r/OSXG4X)
- Follow us on Telegram for the latest EigenLayer alpha: **@dibi8crypto**

* * *

*© 2026 dibi8.com | Built for DeFi developers, traders, and researchers.*


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  "@context": "https://schema.org",
  "@type": "Article",
  "headline": "eigenlayer-restaking-defi",
  "datePublished": "2026-05-20",
  "dateModified": "2026-05-20",
  "author": {
    "@type": "Organization",
    "name": "Dibi8"
  },
  "publisher": {
    "@type": "Organization",
    "name": "Dibi8",
    "logo": {
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      "url": "https://dibi8.com/logo.png"
    }
  },
  "mainEntityOfPage": {
    "@type": "WebPage",
    "@id": "https://dibi8.com/resources/eigenlayer-restaking-defi"
  }
}
</script>
## Frequently Asked Questions (FAQ)

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实施SAST扫描、代码审查、依赖审计、以及安全编码培训。

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使用本地模型、环境变量管理密钥、避免在提示中包含敏感信息。

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