Fidelity数字资产报告：主权基金为何转向比特币结算

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
import "@openzeppelin/contracts/access/AccessControl.sol";
import "@openzeppelin/contracts/utils/ReentrancyGuard.sol";

contract SovereignReserve is AccessControl, ReentrancyGuard {
    bytes32 public constant FUND_MANAGER_ROLE = keccak256("FUND_MANAGER_ROLE");
    bytes32 public constant AUDITOR_ROLE = keccak256("AUDITOR_ROLE");

    enum AssetClass {
        BITCOIN,
        GOLD,
        USD_BONDS,
        SOVEREIGN_DEBT,
        REAL_ESTATE,
        ALTERNATIVES
    }

    enum ReserveStatus {
        ACTIVE,
        FROZEN,
        REBALANCING,
        LIQUIDATING
    }

    struct SovereignFund {
        string fundName;
        string country;
        uint256 totalAUM;          // Total Assets Under Management (USD cents)
        uint256 bitcoinAllocation;  // BTC allocation (sats)
        uint256 goldAllocation;     // Gold allocation (grams)
        uint256 fiatAllocation;     // Fiat allocation (USD cents)
        uint256 bitcoinTarget;      // Target BTC allocation percentage (0-10000)
        ReserveStatus status;
        uint256 lastRebalance;
        bool isActive;
    }

    struct SettlementTransaction {
        uint256 settlementId;
        address fromCountry;
        address toCountry;
        uint256 amount;             // BTC amount (sats)
        uint256 usdValue;           // USD value at settlement
        uint256 timestamp;
        bytes32 invoiceHash;
        bool settled;
        bool disputed;
    }

    struct AuditReport {
        uint256 reportId;
        uint256 timestamp;
        uint256 totalReserves;
        uint256 bitcoinReserve;
        uint256 proofOfReserves;
        bytes32 auditHash;
        address auditor;
    }

    mapping(address => SovereignFund) public funds;
    mapping(uint256 => SettlementTransaction) public settlements;
    mapping(uint256 => AuditReport) public audits;
    mapping(address => uint256) public reserveBalances;

    uint256 private _settlementCounter;
    uint256 private _auditCounter;
    uint256 public constant MIN_BITCOIN_ALLOCATION = 100; // 0.01%
    uint256 public constant MAX_BITCOIN_ALLOCATION = 5000; // 50%
    uint256 public constant REBALANCE_COOLDOWN = 90 days;
    uint256 public bitcoinPrice;  // USD price (cents)

    event FundRegistered(address indexed fundAddress, string fundName, uint256 totalAUM);
    event SettlementExecuted(uint256 indexed settlementId, address indexed from, address indexed to, uint256 amount);
    event AuditCompleted(uint256 indexed reportId, uint256 totalReserves, bytes32 auditHash);
    event RebalanceExecuted(address indexed fund, uint256 newBitcoinAllocation);

    constructor() {
        _grantRole(DEFAULT_ADMIN_ROLE, msg.sender);
        _grantRole(AUDITOR_ROLE, msg.sender);
        bitcoinPrice = 350000 * 100; // $350,000 per BTC in cents
    }

    function registerFund(
        string memory _fundName,
        string memory _country,
        uint256 _totalAUM,
        uint256 _initialBitcoinAllocation,
        uint256 _bitcoinTarget
    ) external {
        require(funds[msg.sender].fundAddress == address(0), "Already registered");
        require(_bitcoinTarget >= MIN_BITCOIN_ALLOCATION, "Below minimum allocation");
        require(_bitcoinTarget <= MAX_BITCOIN_ALLOCATION, "Above maximum allocation");

        funds[msg.sender] = SovereignFund({
            fundName: _fundName,
            country: _country,
            totalAUM: _totalAUM,
            bitcoinAllocation: _initialBitcoinAllocation,
            goldAllocation: 0,
            fiatAllocation: _totalAUM - (_initialBitcoinAllocation * bitcoinPrice / 100),
            bitcoinTarget: _bitcoinTarget,
            status: ReserveStatus.ACTIVE,
            lastRebalance: block.timestamp,
            isActive: true
        });

        reserveBalances[msg.sender] = _initialBitcoinAllocation;
        _grantRole(FUND_MANAGER_ROLE, msg.sender);

        emit FundRegistered(msg.sender, _fundName, _totalAUM);
    }

    function executeSettlement(
        address _toCountry,
        uint256 _amount,
        string memory _invoiceRef
    ) external onlyRole(FUND_MANAGER_ROLE) nonReentrant {
        require(funds[msg.sender].isActive, "Fund not active");
        require(funds[_toCountry].isActive, "Counterparty fund not active");
        require(reserveBalances[msg.sender] >= _amount, "Insufficient BTC reserves");

        _settlementCounter++;
        uint256 settlementId = _settlementCounter;

        uint256 usdValue = _amount * bitcoinPrice / 100000000; // sats to USD

        reserveBalances[msg.sender] -= _amount;
        reserveBalances[_toCountry] += _amount;

        settlements[settlementId] = SettlementTransaction({
            settlementId: settlementId,
            fromCountry: msg.sender,
            toCountry: _toCountry,
            amount: _amount,
            usdValue: usdValue,
            timestamp: block.timestamp,
            invoiceHash: keccak256(abi.encodePacked(_invoiceRef, settlementId)),
            settled: true,
            disputed: false
        });

        emit SettlementExecuted(settlementId, msg.sender, _toCountry, _amount);
    }

    function rebalancePortfolio(uint256 _newBitcoinAllocation) 
        external onlyRole(FUND_MANAGER_ROLE) {
        SovereignFund storage fund = funds[msg.sender];
        require(block.timestamp >= fund.lastRebalance + REBALANCE_COOLDOWN, "Cooldown active");
        require(_newBitcoinAllocation >= MIN_BITCOIN_ALLOCATION, "Below minimum");
        require(_newBitcoinAllocation <= MAX_BITCOIN_ALLOCATION, "Above maximum");

        uint256 targetSats = fund.totalAUM * _newBitcoinAllocation / 100 / (bitcoinPrice / 100);
        uint256 currentSats = reserveBalances[msg.sender];

        if (targetSats > currentSats) {
            // Buy BTC
            uint256 deficit = targetSats - currentSats;
            reserveBalances[msg.sender] += deficit;
            fund.fiatAllocation -= deficit * bitcoinPrice / 100000000;
        } else {
            // Sell BTC
            uint256 surplus = currentSats - targetSats;
            reserveBalances[msg.sender] -= surplus;
            fund.fiatAllocation += surplus * bitcoinPrice / 100000000;
        }

        fund.bitcoinAllocation = targetSats;
        fund.bitcoinTarget = _newBitcoinAllocation;
        fund.lastRebalance = block.timestamp;
        fund.status = ReserveStatus.ACTIVE;

        emit RebalanceExecuted(msg.sender, _newBitcoinAllocation);
    }

    function conductAudit() external onlyRole(AUDITOR_ROLE) nonReentrant {
        _auditCounter++;
        uint256 reportId = _auditCounter;

        uint256 totalReserves = 0;
        uint256 totalBitcoin = 0;

        for (uint256 i = 0; i < _settlementCounter; i++) {
            if (settlements[i].settled && !settlements[i].disputed) {
                totalReserves += settlements[i].usdValue;
            }
        }

        totalBitcoin = address(this).balance;
        bytes32 auditHash = keccak256(abi.encodePacked(
            reportId, totalReserves, totalBitcoin, block.timestamp
        ));

        audits[reportId] = AuditReport({
            reportId: reportId,
            timestamp: block.timestamp,
            totalReserves: totalReserves,
            bitcoinReserve: totalBitcoin,
            proofOfReserves: totalBitcoin,
            auditHash: auditHash,
            auditor: msg.sender
        });

        emit AuditCompleted(reportId, totalReserves, auditHash);
    }

    function getFund(address _fund) 
        external view returns (SovereignFund memory) {
        return funds[_fund];
    }

    function getSettlement(uint256 _settlementId) 
        external view returns (SettlementTransaction memory) {
        return settlements[_settlementId];
    }

    function getAudit(uint256 _reportId) 
        external view returns (AuditReport memory) {
        return audits[_reportId];
    }

    function getTotalBitcoinReserves() 
        external view returns (uint256) {
        uint256 total = 0;
        for (uint256 i = 0; i < _settlementCounter; i++) {
            if (settlements[i].settled) {
                total += settlements[i].amount;
            }
        }
        return total;
    }

    function updateBitcoinPrice(uint256 _newPrice) 
        external onlyRole(DEFAULT_ADMIN_ROLE) {
        bitcoinPrice = _newPrice;
    }
}

"""
主权基金比特币配置分析系统 - 模拟Fidelity报告的核心分析方法
实现资产配置优化、风险分析和结算模拟
"""

import asyncio
import random
import hashlib
import time
from typing import Dict, List, Optional, Tuple
from dataclasses import dataclass, field
from enum import Enum
import statistics
import math

class FundType(Enum):
    SOVEREIGN_WEALTH = "sovereign_wealth"  # 主权财富基金
    CENTRAL_BANK = "central_bank"          # 中央银行
    PENSION_FUND = "pension_fund"          # 养老基金
    ENDOWMENT = "endowment"                # 捐赠基金

class AssetType(Enum):
    BITCOIN = "bitcoin"
    GOLD = "gold"
    US_TREASURY = "us_treasury"
    EQUITY = "equity"
    BOND = "bond"
    REAL_ESTATE = "real_estate"
    CASH = "cash"

@dataclass
class SovereignFund:
    fund_id: str
    name: str
    country: str
    fund_type: FundType
    total_aum: float  # 总资产管理规模（USD）
    bitcoin_allocation: float  # BTC配置量
    bitcoin_target_pct: float  # BTC目标比例
    current_portfolio: Dict[AssetType, float]
    risk_tolerance: float  # 0-1
    investment_horizon: int  # 年
    rebalance_frequency: int  # 天
    is_btc_enabled: bool

@dataclass
class MarketData:
    bitcoin_price: float
    gold_price: float
    usd_index: float
    sp500: float
    vol_index: float  # VIX
    timestamp: float

@dataclass
class PortfolioAnalysis:
    expected_return: float
    volatility: float
    sharpe_ratio: float
    max_drawdown: float
    correlation_with_oil: float
    correlation_with_gold: float
    btc_contribution: float

class SovereignBitcoinAnalytics:
    """
    主权基金比特币配置分析系统
    模拟Fidelity报告的分析方法
    """
    
    def __init__(self):
        self.funds: Dict[str, SovereignFund] = {}
        self.market_history: List[MarketData] = []
        self.settlements: List[Dict] = []
        self.total_sovereign_btc = 0.0
        
    def register_fund(
        self,
        name: str,
        country: str,
        fund_type: FundType,
        total_aum: float,
        risk_tolerance: float,
        investment_horizon: int
    ) -> str:
        """注册主权基金"""
        fund_id = hashlib.sha256(
            f"fund_{len(self.funds)}_{name}_{time.time()}".encode()
        ).hexdigest()[:12]
        
        # 初始配置
        portfolio = {
            AssetType.US_TREASURY: total_aum * 0.40,
            AssetType.EQUITY: total_aum * 0.30,
            AssetType.BOND: total_aum * 0.20,
            AssetType.GOLD: total_aum * 0.07,
            AssetType.CASH: total_aum * 0.03,
            AssetType.BITCOIN: 0.0,
            AssetType.REAL_ESTATE: 0.0
        }
        
        fund = SovereignFund(
            fund_id=fund_id,
            name=name,
            country=country,
            fund_type=fund_type,
            total_aum=total_aum,
            bitcoin_allocation=0.0,
            bitcoin_target_pct=0.0,
            current_portfolio=portfolio,
            risk_tolerance=risk_tolerance,
            investment_horizon=investment_horizon,
            rebalance_frequency=90,
            is_btc_enabled=False
        )
        
        self.funds[fund_id] = fund
        return fund_id
    
    def enable_bitcoin_allocation(
        self,
        fund_id: str,
        target_pct: float
    ) -> Dict:
        """启用比特币配置"""
        if fund_id not in self.funds:
            raise ValueError("基金不存在")
        
        fund = self.funds[fund_id]
        fund.bitcoin_target_pct = target_pct
        
        # 重新分配资产
        reallocation_amount = fund.total_aum * (target_pct / 100)
        fund.bitcoin_allocation = reallocation_amount / 350000  # 假设BTC=$350K
        
        # 从其他资产中扣除
        reductions = {
            AssetType.US_TREASURY: reallocation_amount * 0.5,
            AssetType.BOND: reallocation_amount * 0.3,
            AssetType.CASH: reallocation_amount * 0.2
        }
        
        for asset, amount in reductions.items():
            fund.current_portfolio[asset] -= amount
        
        fund.current_portfolio[AssetType.BITCOIN] = reallocation_amount
        fund.is_btc_enabled = True
        
        self.total_sovereign_btc += fund.bitcoin_allocation
        
        return {
            "fund": fund.name,
            "target_pct": target_pct,
            "btc_amount": fund.bitcoin_allocation,
            "usd_value": reallocation_amount,
            "reallocated_from": reductions
        }
    
    def simulate_market_conditions(self, days: int = 365) -> List[MarketData]:
        """模拟市场条件"""
        market_data = []
        btc_price = 35000  # 起始价格
        
        for day in range(days):
            # 模拟BTC价格（随机游走+趋势）
            trend = 0.0003  # 每日上涨趋势
            noise = random.gauss(0, 0.02)  # 2%波动
            btc_price *= (1 + trend + noise)
            
            # 模拟其他市场数据
            gold_price = 2000 + random.gauss(0, 10)
            usd_index = 100 - day * 0.01 + random.gauss(0, 0.5)  # 美元缓慢贬值
            sp500 = 4500 + day * 2 + random.gauss(0, 50)
            vol_index = 15 + random.gauss(0, 3)
            
            data = MarketData(
                bitcoin_price=btc_price,
                gold_price=gold_price,
                usd_index=usd_index,
                sp500=sp500,
                vol_index=vol_index,
                timestamp=time.time() + day * 86400
            )
            
            market_data.append(data)
        
        self.market_history = market_data
        return market_data
    
    def analyze_portfolio(
        self,
        fund_id: str,
        market_data: List[MarketData]
    ) -> PortfolioAnalysis:
        """分析投资组合表现"""
        if fund_id not in self.funds:
            raise ValueError("基金不存在")
        
        fund = self.funds[fund_id]
        
        # 计算各资产年化收益
        btc_return = (market_data[-1].bitcoin_price / market_data[0].bitcoin_price) - 1
        gold_return = (market_data[-1].gold_price / market_data[0].gold_price) - 1
        equity_return = (market_data[-1].sp500 / market_data[0].sp500) - 1
        bond_return = 0.03  # 假设债券年化3%
        cash_return = 0.02  # 假设现金年化2%
        
        # 计算投资组合收益
        portfolio_return = (
            fund.current_portfolio.get(AssetType.BITCOIN, 0) / fund.total_aum * btc_return +
            fund.current_portfolio.get(AssetType.GOLD, 0) / fund.total_aum * gold_return +
            fund.current_portfolio.get(AssetType.EQUITY, 0) / fund.total_aum * equity_return +
            fund.current_portfolio.get(AssetType.BOND, 0) / fund.total_aum * bond_return +
            fund.current_portfolio.get(AssetType.CASH, 0) / fund.total_aum * cash_return
        )
        
        # 计算波动率（简化）
        btc_vol = 0.65  # 65%年化波动率
        portfolio_vol = 0.12  # 12%基准波动率
        
        if fund.is_btc_enabled:
            btc_weight = fund.bitcoin_target_pct / 100
            portfolio_vol = math.sqrt(
                (1 - btc_weight)**2 * 0.10**2 +  # 传统资产波动
                btc_weight**2 * btc_vol**2 +
                2 * (1 - btc_weight) * btc_weight * 0.1 * btc_vol * 0.2  # 相关系数0.2
            )
        
        # 夏普比率（假设无风险利率3%）
        risk_free = 0.03
        sharpe = (portfolio_return - risk_free) / portfolio_vol if portfolio_vol > 0 else 0
        
        # 最大回撤（简化）
        max_drawdown = -0.15 if fund.is_btc_enabled else -0.10
        
        # 相关性
        oil_correlation = 0.15  # BTC与石油弱相关
        gold_correlation = 0.35  # BTC与黄金中度相关
        
        # BTC贡献
        btc_contribution = (
            fund.current_portfolio.get(AssetType.BITCOIN, 0) / fund.total_aum * btc_return
        ) if fund.is_btc_enabled else 0
        
        return PortfolioAnalysis(
            expected_return=portfolio_return,
            volatility=portfolio_vol,
            sharpe_ratio=sharpe,
            max_drawdown=max_drawdown,
            correlation_with_oil=oil_correlation,
            correlation_with_gold=gold_correlation,
            btc_contribution=btc_contribution
        )
    
    def simulate_settlement(
        self,
        from_fund_id: str,
        to_fund_id: str,
        amount_usd: float
    ) -> Dict:
        """模拟比特币结算"""
        if from_fund_id not in self.funds or to_fund_id not in self.funds:
            raise ValueError("基金不存在")
        
        from_fund = self.funds[from_fund_id]
        to_fund = self.funds[to_fund_id]
        
        if not from_fund.is_btc_enabled or not to_fund.is_btc_enabled:
            raise ValueError("基金未启用比特币")
        
        # 计算BTC数量
        btc_price = self.market_history[-1].bitcoin_price if self.market_history else 35000
        btc_amount = amount_usd / btc_price
        
        # 检查余额
        if from_fund.bitcoin_allocation < btc_amount:
            raise ValueError("比特币余额不足")
        
        # 执行结算
        from_fund.bitcoin_allocation -= btc_amount
        to_fund.bitcoin_allocation += btc_amount
        
        settlement = {
            "settlement_id": hashlib.sha256(
                f"settlement_{len(self.settlements)}_{time.time()}".encode()
            ).hexdigest()[:16],
            "from_fund": from_fund.name,
            "to_fund": to_fund.name,
            "amount_usd": amount_usd,
            "amount_btc": btc_amount,
            "btc_price": btc_price,
            "timestamp": time.time(),
            "status": "settled"
        }
        
        self.settlements.append(settlement)
        
        return settlement
    
    def get_global_stats(self) -> Dict:
        """获取全球主权基金统计"""
        total_funds = len(self.funds)
        btc_enabled = sum(1 for f in self.funds.values() if f.is_btc_enabled)
        total_aum = sum(f.total_aum for f in self.funds.values())
        total_btc = sum(f.bitcoin_allocation for f in self.funds.values())
        
        # 平均配置比例
        enabled_funds = [f for f in self.funds.values() if f.is_btc_enabled]
        avg_target = statistics.mean(
            [f.bitcoin_target_pct for f in enabled_funds]
        ) if enabled_funds else 0
        
        # 结算统计
        total_settlements = len(self.settlements)
        total_settlement_volume = sum(s["amount_usd"] for s in self.settlements)
        
        return {
            "total_funds": total_funds,
            "btc_enabled_funds": btc_enabled,
            "adoption_rate": btc_enabled / total_funds if total_funds > 0 else 0,
            "total_aum_usd": total_aum,
            "total_bitcoin_holdings": total_btc,
            "total_bitcoin_value_usd": total_btc * 35000,
            "avg_target_allocation": round(avg_target, 2),
            "total_settlements": total_settlements,
            "total_settlement_volume_usd": total_settlement_volume
        }

# 运行模拟
async def main():
    analytics = SovereignBitcoinAnalytics()
    
    print("=== Fidelity主权基金比特币配置报告模拟 ===\n")
    
    # 注册主权基金
    print("注册主权基金...")
    funds_data = [
        ("Norway GPFG", "Norway", FundType.SOVEREIGN_WEALTH, 1.7e12, 0.3, 50),
        ("Abu Dhabi ADIA", "UAE", FundType.SOVEREIGN_WEALTH, 1.1e12, 0.4, 40),
        ("Singapore GIC", "Singapore", FundType.SOVEREIGN_WEALTH, 8.0e11, 0.35, 45),
        ("Saudi PIF", "Saudi Arabia", FundType.SOVEREIGN_WEALTH, 7.5e11, 0.5, 30),
        ("Qatar QIA", "Qatar", FundType.SOVEREIGN_WEALTH, 4.5e11, 0.45, 35),
        ("Swiss SNB", "Switzerland", FundType.CENTRAL_BANK, 9.0e11, 0.2, 60),
        ("Japan BOJ", "Japan", FundType.CENTRAL_BANK, 1.3e12, 0.15, 55),
        ("China CIC", "China", FundType.SOVEREIGN_WEALTH, 1.2e12, 0.25, 50),
        ("Kuwait KIA", "Kuwait", FundType.SOVEREIGN_WEALTH, 7.0e11, 0.4, 40),
        ("Temasek", "Singapore", FundType.SOVEREIGN_WEALTH, 3.5e11, 0.5, 35),
    ]
    
    fund_ids = {}
    for name, country, ftype, aum, risk, horizon in funds_data:
        fid = analytics.register_fund(name, country, ftype, aum, risk, horizon)
        fund_ids[name] = fid
        print(f"  {name[:20]}: ${aum:.1e} AUM, {country}")
    
    # 模拟市场条件
    print("\n模拟市场数据（365天）...")
    market_data = analytics.simulate_market_conditions(365)
    print(f"  BTC价格: ${market_data[0].bitcoin_price:.0f} → ${market_data[-1].bitcoin_price:.0f}")
    print(f"  美元指数: {market_data[0].usd_index:.1f} → {market_data[-1].usd_index:.1f}")
    
    # 启用比特币配置
    print("\n启用比特币配置...")
    btc_configs = [
        ("Norway GPFG", 3.0),
        ("Abu Dhabi ADIA", 5.0),
        ("Singapore GIC", 4.0),
        ("Saudi PIF", 7.0),
        ("Qatar QIA", 6.0),
        ("Swiss SNB", 1.0),
        ("Kuwait KIA", 5.0),
        ("Temasek", 8.0),
    ]
    
    for name, target in btc_configs:
        result = analytics.enable_bitcoin_allocation(fund_ids[name], target)
        print(f"  {name[:20]}: {target}% → ${result['usd_value']:.1e} BTC ({result['btc_amount']:.2f} BTC)")
    
    # 分析投资组合
    print("\n=== 投资组合分析 ===\n")
    for name, fid in fund_ids.items():
        if analytics.funds[fid].is_btc_enabled:
            analysis = analytics.analyze_portfolio(fid, market_data)
            print(f"{name[:20]}:")
            print(f"  预期收益: {analysis.expected_return:.2%}")
            print(f"  波动率: {analysis.volatility:.2%}")
            print(f"  夏普比率: {analysis.sharpe_ratio:.3f}")
            print(f"  BTC贡献: {analysis.btc_contribution:.2%}")
            print()
    
    # 模拟比特币结算
    print("=== 跨境结算模拟 ===\n")
    
    settlements = [
        ("Norway GPFG", "Abu Dhabi ADIA", 500000000),
        ("Singapore GIC", "Saudi PIF", 300000000),
        ("Qatar QIA", "Swiss SNB", 200000000),
    ]
    
    for from_fund, to_fund, amount in settlements:
        result = analytics.simulate_settlement(fund_ids[from_fund], fund_ids[to_fund], amount)
        print(f"  {from_fund[:15]} → {to_fund[:15]}: "
              f"${amount/1e6:.0f}M (${result['btc_price']:.0f}/BTC, "
              f"{result['amount_btc']:.2f} BTC)")
    
    # 全球统计
    print("\n=== 全球统计 ===")
    stats = analytics.get_global_stats()
    for key, value in stats.items():
        if isinstance(value, float):
            print(f"  {key}: {value:.2%}" if "rate" in key else f"  {key}: ${value:.2e}" if "usd" in key else f"  {key}: {value:.2f}")
        else:
            print(f"  {key}: {value}")

if __name__ == "__main__":
    asyncio.run(main())