# Position

Depending on the parameters of the order (leverage, expiration date) the appropriate futures contract hash is generated by the DMEX Web Application and sent for matching to the DMEX server.

The matching is performed as is usually done on an exchange, buy orders and sell orders are matched against one another and if the price condition matches, a new trade is created. The trade is then sent to the Smart Contract and a position is opened.

A position contains the following parameters:

| Parameter  | Type   | Description                                                      |
| ---------- | ------ | ---------------------------------------------------------------- |
| size       | uint64 | the size of the position in terms of the underlying asset (x1e8) |
| price      | uint64 | the average entry price                                          |
| side       | uint16 | 0 or 1 (1 - long, 0 - short)                                     |
| entryBlock | uint48 | the average entry block for the position                         |
| collateral | uint64 | the amount of collateral (margin) reserved for the position      |

Each position has its unique hash comprised from the user address, futures contract hash and side.

```javascript
function generatePositionHash (address user, bytes32 futuresContractHash, bool side) public view returns (bytes32)
{
    return keccak256(this, user, futuresContractHash, side);
}
```


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