    function mint(
        MintTrade memory _mintTrade
    ) external onlyMinter {
        uint newTokenID = _tokenIds.current();

        Trade storage newTrade = _trades[newTokenID];
        newTrade.margin = _mintTrade.margin;
        newTrade.leverage = _mintTrade.leverage;
        newTrade.asset = _mintTrade.asset;
        newTrade.direction = _mintTrade.direction;
        newTrade.price = _mintTrade.price;
        newTrade.tpPrice = _mintTrade.tp;
        newTrade.slPrice = _mintTrade.sl;
        newTrade.orderType = _mintTrade.orderType;
        newTrade.id = newTokenID;
        newTrade.tigAsset = _mintTrade.tigAsset;

        _safeMint(_mintTrade.account, newTokenID);   // make external call because of safeMint() usage
        if (_mintTrade.orderType > 0) { // update the values of some storage functions
            _limitOrders[_mintTrade.asset].push(newTokenID);
            _limitOrderIndexes[_mintTrade.asset][newTokenID] = _limitOrders[_mintTrade.asset].length-1;
        } else {
            initId[newTokenID] = accInterestPerOi[_mintTrade.asset][_mintTrade.tigAsset][_mintTrade.direction]*int256(_mintTrade.margin*_mintTrade.leverage/1e18)/1e18;
            _openPositions.push(newTokenID);
            _openPositionsIndexes[newTokenID] = _openPositions.length-1;

            _assetOpenPositions[_mintTrade.asset].push(newTokenID);
            _assetOpenPositionsIndexes[_mintTrade.asset][newTokenID] = _assetOpenPositions[_mintTrade.asset].length-1;
        }
        _tokenIds.increment();
    }
