數(shù)字藏品（Non-fungible toke）即非同質(zhì)化代幣，是指使用區(qū)塊鏈技術(shù)，對應(yīng)特定的作品、藝術(shù)品生成的唯一數(shù)字憑證，在保護其數(shù)字版權(quán)的基礎(chǔ)上，實現(xiàn)真實可信的數(shù)字化發(fā)行、購買、收藏和使用。每個NFT商品都是唯一的，承載了獨特的數(shù)字資產(chǎn)價值。

　　數(shù)字藏品為數(shù)字出版物的一種新形態(tài)，并分為區(qū)塊鏈作品版權(quán)和區(qū)塊鏈數(shù)字出版產(chǎn)品兩種產(chǎn)品類型。

　　///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);

　　}功能及源碼詳細I35分析7O98開發(fā)O7I8

　　using LowGasSafeMath for uint256;

　　using LowGasSafeMath for int256;

　　using SafeCast for uint256;

　　using SafeCast for int256;

　　using Tick for mapping(int24=>Tick.Info);

　　using TickBitmap for mapping(int16=>uint256);

　　using Position for mapping(bytes32=>Position.Info);

　　using Position for Position.Info;

　　using Oracle for Oracle.Observation[65535];

　　///inheritdoc IUniswapV3PoolImmutables

　　address public immutable override factory;

　　///inheritdoc IUniswapV3PoolImmutables

　　address public immutable override token0;

　　///inheritdoc IUniswapV3PoolImmutables

　　address public immutable override token1;

　　///inheritdoc IUniswapV3PoolImmutables

　　uint24 public immutable override fee;

　　///inheritdoc IUniswapV3PoolImmutables

　　int24 public immutable override tickSpacing;//刻度間隔

　　///inheritdoc IUniswapV3PoolImmutables

　　uint128 public immutable override maxLiquidityPerTick;//可使用范圍內(nèi)任何刻度的頭寸流動性的最大金額

　　struct Slot0{開發(fā)設(shè)計：MrsFu123

　　//the current price

　　uint160 sqrtPriceX96;

　　//the current tick

　　int24 tick;

　　//the most-recently updated index of the observations array

　　uint16 observationIndex;

　　//the current maximum number of observations that are being stored

　　uint16 observationCardinality;

　　//the next maximum number of observations to store,triggered in observations.write

　　uint16 observationCardinalityNext;

　　//the current protocol fee as a percentage of the swap fee taken on withdrawal

　　//represented as an integer denominator(1/x)%

　　uint8 feeProtocol;

　　//whether the pool is locked

　　bool unlocked;

　　}

　　///inheritdoc IUniswapV3PoolState

　　Slot0 public override slot0;