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数据结构
Validator的奖励：
reward=base+a*n（n是Header中提议的块数=end-start）
struct Reward{
uint256 base;
uint256 a;
} Reward reward;
uint256 public maxReward
//连续块头的默克尔树的根
mapping(address=>bytes32[])roots;
//每一个桥接链的最后一块的块号
mapping(address=>uint256)lastBlock;
//只有Admin才能创建和建立侧链和主链的映射
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//fromChainId=>(oldTokenAddr=>newTokenAddr)
mapping(address=>mapping(address=>address))tokens;Block
//对一个给定的链，一个特定的EPOCH，记录开始块和终块并提供Headerroot
event RootStorage(address indexed chain,uint256 indexed start,
uint256 indexed end,bytes32 headerRoot,uint256 i,address proposer);
event Deposit(address indexed user,address indexed toChain,
address indexed depositToken,address fromChain,uint256 amount);
event Withdraw(address indexed user,address indexed fromChain,
address indexed withdrawToken,uint256 amount);
event TokenAdded(address indexed fromChain,address indexed origToken,
address indexed newToken);
event TokenAssociated(address indexed toChain,address indexed fromToken,
address indexed toToken);
//Pending withdrawals.The user prepares a withdrawal with tx data and then
//releases it with a withdraw.It can be overwritten by the user and gets wiped
//upon withdrawal.
struct Withdrawal{
address withdrawToken;//Token to withdraw(i.e.the one mapped to deposit)
address fromChain;
uint256 amount;//Number of atomic units to withdraw
bytes32 txRoot;//Transactions root for the block housing this tx
bytes32 txHash;//Hash of this tx
bytes32 receiptsRoot;//Receipts root for the block housing this tx
}
mapping(address=>Withdrawal)pendingWithdrawals;
