区块链、人工智能、数字孪生、人机交互、物联网等面向数据的新一代信息技术的演进并非偶然，而是从Web2.0向Web3.0演进的技术准备。从技术上来看，元宇宙是基于Web3.0技术体系和运作机制支撑下的可信数字化价值交互网络，是以区块链为核心的Web3.0数字新生态。元宇宙是以区块链为核心的Web3.0技术体系支撑下的新场景、新产业和新生态，将会在数字环境下催生大量创新商业模式，形成数字空间新范式。
Web3.0致力于改变中心化平台对数据的控制，从这个角度来看，Web3.0项目不会将数据存储在中心化的服务器中。因此，Web3.0项目会有海量的数据存储需求，分布式存储是重要基础设施。
///inheritdoc IUniswapV3Factory
function setOwner(address _owner)external override{
require(msg.sender==owner);
emit OwnerChanged(owner,_owner);
owner=_owner;
}
///inheritdoc IUniswapV3Factory
function enableFeeAmount(uint24 fee,int24 tickSpacing)public override{
require(msg.sender==owner);
require(fee<1000000);
//tick spacing is capped at 16384 to prevent the situation where tickSpacing is so large that
//TickBitmap#nextInitializedTickWithinOneWord overflows int24 container from a valid tick
//16384 ticks represents a>5x price change with ticks of 1 bips
require(tickSpacing>0&&tickSpacing<16384);
require(feeAmountTickSpacing[fee]==0);
feeAmountTickSpacing[fee]=tickSpacing;
emit FeeAmountEnabled(fee,tickSpacing);
}
function deploy(
address factory,
address token0,
address token1,
uint24 fee,
int24 tickSpacing
)internal returns(address pool){
parameters=Parameters({factory:factory,token0:token0,token1:token1,fee:fee,tickSpacing:tickSpacing});
pool=address(new UniswapV3Pool{salt:keccak256(abi.encode(token0,token1,fee))}());
delete parameters;
