const serializeOrder = (signedOrder: SignedOrder): SignedOrderModel => {
    const signedOrderModel = new SignedOrderModel({
        signature: signedOrder.signature,
        senderAddress: signedOrder.senderAddress,
        makerAddress: signedOrder.makerAddress,
        takerAddress: signedOrder.takerAddress,
        makerFee: signedOrder.makerFee.toString(),
        takerFee: signedOrder.takerFee.toString(),
        makerAssetAmount: signedOrder.makerAssetAmount.toString(),
        takerAssetAmount: signedOrder.takerAssetAmount.toString(),
        makerAssetData: signedOrder.makerAssetData,
        takerAssetData: signedOrder.takerAssetData,
        salt: signedOrder.salt.toString(),
        exchangeAddress: signedOrder.exchangeAddress,
        feeRecipientAddress: signedOrder.feeRecipientAddress,
        expirationTimeSeconds: signedOrder.expirationTimeSeconds.toNumber(),
        hash: orderHashUtils.getOrderHashHex(signedOrder),
    });
    return signedOrderModel;
};

 .filter(order => !shadowedOrders.has(orderHashUtils.getOrderHashHex(order)))