# Polkadot

## **getPolkadotSignedTransaction**

**This function for :**

* `.POLKADOT` - polkadot (DOT)

### **Parameters**

* coinType: polkadot networks coin type
* polkadotTransaction: ([PolkadotTransation](#class-polkadottransaction))polkadot transaction parameter

#### **class** PolkadotTransaction

| Name        | Type     | Description                                                                                         |
| ----------- | -------- | --------------------------------------------------------------------------------------------------- |
| sigHash     | `String` | transaction that has not been signed of polkadot transaction                                        |
| key         | `String` | sign key path for polkadot transaction                                                              |
| fee         | `String` | <p>transaction fee of polkadot transaction<br>\* fee value is configured in polkadot(DOT) unit.</p> |
| nonce       | `String` | (optional)transaction nonce of polkadot transaction)                                                |
| decimals    | `String` | transaction decimals of polkadot transaction                                                        |
| symbol      | `String` | transaction symbol of polkadot transaction                                                          |
| optionParam | `String` | (optional)option parameter                                                                          |

### **Returns**

* result: (Bool) `true` if successful, `false` if error occurred
* txData: signed transaction

### **Requirements**

* D'CENT Biometric Wallet version 2.19.1 or higher is required.

**Example**

```swift
let polkadotTransaction : PolkadotTransaction = PolkadotTransaction(sigHash: "040000163a5ee36b1243ce5241c0a45010dd1717869e9918c040bf5d305be4a5af9e7a0b00407a10f35a003400a223000007000000e143f23803ac50e8f6f8e62695d1ce9e4e1d68aa36c1cd2cfd15340213f3423ee143f23803ac50e8f6f8e62695d1ce9e4e1d68aa36c1cd2cfd15340213f3423e", key: "m/44'/354'/0'/0/0", fee: "0.0000000005", decimals: 12, symbol: "DOT", optionParam: "")
  
DcentMgr.getPolkadotSignedTransaction(coinType: .POLKADOT, polkadotTransaction: polkadotTransaction) { (result, txData) in
    print("Polkadot Transaction closure")
    if result == false {
        print("FAIL !!!")
    }else{
        print(txData)
    }
}
```