去中心化流媒体vs中心化平台：观众选择权的数据主权之战

pragma solidity ^0.8.20;

contract StreamingRevenue {
    address public creator;
    address public platform;
    uint256 public creatorShare;
    uint256 public platformShare;
    uint256 public viewerRewardPool;

    struct ViewRecord {
        address viewer;
        uint256 duration;
        uint256 timestamp;
    }

    mapping(address => ViewRecord[]) public viewHistory;

    event RevenueDistributed(address indexed creator, uint256 creatorAmount, uint256 platformAmount, uint256 viewerAmount);

    constructor(uint256 _creatorBps, uint256 _platformBps) {
        creator = msg.sender;
        platform = tx.origin;
        creatorShare = _creatorBps;
        platformShare = _platformBps;
        viewerRewardPool = 10000 - _creatorBps - _platformBps;
    }

    function recordView(address viewer, uint256 duration) external {
        viewHistory[viewer].push(ViewRecord(viewer, duration, block.timestamp));
    }

    function distribute(uint256 totalRevenue) external payable {
        require(msg.value >= totalRevenue, "Insufficient payment");
        uint256 toCreator = (totalRevenue * creatorShare) / 10000;
        uint256 toPlatform = (totalRevenue * platformShare) / 10000;
        uint256 toViewers = totalRevenue - toCreator - toPlatform;
        payable(creator).transfer(toCreator);
        payable(platform).transfer(toPlatform);
        emit RevenueDistributed(creator, toCreator, toPlatform, toViewers);
    }
}

import hashlib
import json
import requests
from datetime import datetime

class DataPrivacyMonitor:
    def __init__(self, node_endpoint, chain_id):
        self.node_endpoint = node_endpoint
        self.chain_id = chain_id
        self.violations = []

    def hash_user_data(self, raw_data):
        salt = b"streaming_vault_2026"
        return hashlib.sha256(salt + raw_data.encode()).hexdigest()

    def check_data_consent(self, user_address, data_type):
        payload = {
            "jsonrpc": "2.0",
            "method": "eth_call",
            "params": [{
                "to": "0xConsentRegistryAddress",
                "data": self.encode_consent_check(user_address, data_type)
            }, "latest"],
            "id": self.chain_id
        }
        response = requests.post(self.node_endpoint, json=payload)
        result = response.json().get("result", "0x")
        consent_granted = int(result, 16) == 1
        return consent_granted

    def encode_consent_check(self, address, data_type):
        func_sig = "0x7c5e2138"
        padded_addr = address[2:].lower().zfill(64)
        padded_type = data_type.encode().hex().ljust(64, "0")
        return func_sig + padded_addr + padded_type

    def audit_data_access(self, contract_address, block_range):
        audit_log = []
        for block_num in range(block_range[0], block_range[1] + 1):
            payload = {
                "jsonrpc": "2.0",
                "method": "eth_getLogs",
                "params": [{
                    "address": contract_address,
                    "fromBlock": hex(block_num),
                    "toBlock": hex(block_num),
                    "topics": ["0xDataAccessEvent"]
                }],
                "id": self.chain_id
            }
            response = requests.post(self.node_endpoint, json=payload)
            logs = response.json().get("result", [])
            for log in logs:
                entry = {
                    "block": block_num,
                    "tx_hash": log["transactionHash"],
                    "data": log["data"],
                    "timestamp": datetime.utcnow().isoformat()
                }
                audit_log.append(entry)
        return audit_log

    def generate_report(self):
        report = {
            "generated_at": datetime.utcnow().isoformat(),
            "chain_id": self.chain_id,
            "total_violations": len(self.violations),
            "compliance_status": "PASS" if len(self.violations) == 0 else "FAIL",
            "violations": self.violations
        }
        return json.dumps(report, indent=2)

const measureLatency = async (url, iterations = 10) => {
    const results = [];
    for (let i = 0; i < iterations; i++) {
        const start = performance.now();
        await fetch(url, { method: "HEAD", mode: "no-cors" });
        const end = performance.now();
        results.push(end - start);
    }
    return {
        avg: results.reduce((a, b) => a + b, 0) / iterations,
        min: Math.min(...results),
        max: Math.max(...results),
        p95: results.sort((a, b) => a - b)[Math.floor(iterations * 0.95)]
    };
};

const comparePlatforms = async () => {
    const centralized = await measureLatency("https://api.netflix.com/edge", 20);
    const decentralized = await measureLatency("https://gateway.ipfs.io", 20);

    const comparison = {
        timestamp: new Date().toISOString(),
        centralized: {
            platform: "Netflix Edge API",
            avgLatencyMs: centralized.avg.toFixed(2),
            p95LatencyMs: centralized.p95.toFixed(2)
        },
        decentralized: {
            platform: "IPFS Public Gateway",
            avgLatencyMs: decentralized.avg.toFixed(2),
            p95LatencyMs: decentralized.p95.toFixed(2)
        },
        gap: {
            avgRatio: (decentralized.avg / centralized.avg).toFixed(2),
            p95Ratio: (decentralized.p95 / centralized.p95).toFixed(2)
        }
    };

    console.log(JSON.stringify(comparison, null, 2));
    return comparison;
};

const benchmarkStreaming = async (platformType, contentHash) => {
    const chunkSize = 1024 * 1024;
    const totalSize = chunkSize * 100;
    const startFetch = performance.now();

    const chunks = [];
    for (let offset = 0; offset < totalSize; offset += chunkSize) {
        const chunkStart = performance.now();
        const response = await fetch(`${platformType}/${contentHash}?offset=${offset}&size=${chunkSize}`);
        const data = await response.arrayBuffer();
        chunks.push(data);
        const chunkEnd = performance.now();
        console.log(`Chunk ${offset / chunkSize + 1}/100: ${(chunkEnd - chunkStart).toFixed(2)}ms`);
    }

    const totalEnd = performance.now();
    return {
        platform: platformType,
        contentHash: contentHash,
        totalTimeMs: (totalEnd - startFetch).toFixed(2),
        throughputMbps: ((totalSize * 8) / (totalEnd - startFetch) / 1000).toFixed(2),
        chunksReceived: chunks.length
    };
};

comparePlatforms();