# Bitcoin

## **getBitcoinSignedTransaction**

The D'CENT Android SDK provides functions for signing transaction of coins.

**This function for :**

* `BITCOIN` (BTC) - bitcoin
* `BITCOIN_SV` (BSV) - bitcoin sv
* `BTC_SEGWIT` (BTC) - bitcoin segwit
* `MONACOIN` (MONA) - monacoin
* `LITECOIN` (LTC) - litecoin
* `LTC_SEGWIT` (LTC) - litecoin segwit
* `ZCASH` (ZEC) - zcash
* `HORIZEN` (ZEN) - horizen
* `BITCOINCASH` (BCH) - bitcoin cash
* `DOGECOIN` (DOGE) - dogecoin
* `BITCOINABC` (BCHA) - bitcoin cash abc
* `ECASH` (XEC) - ecash
* `DASH` (DASH) - dash
* `BITCOIN_GOLD` (BTG) - bitcoin gold
* `DIGIBYTE` (DGB) - digibyte
* `DGB_SEGWIT` (DGB)- digibyte segwit
* `RAVENCOIN` (RVN) - ravencoin
* `BITCOIN_TESTNET` (BTCt) - bitcoin testnset
* `BTC_SEGWIT_TESTNET` (BTCt) - bitcoin segwit testnet
* `MONACOIN_TESTNET` (MONAt) - monacoin testnet
* `LITE_TESTNET` (tLTC) - litecoin testnet
* `LTC_SEGWIT_TESTNET` (tLTC) - litecoin segwit testnet
* `ZCASH_TESTNET` (TAZ) - zcash testnet
* `BCH_TESTNET` (tBCH)- bitocin cash testnet
* `DASH_TESTENET` (tDASH) - dash testnet
* `BTG_TESTNET` (tBTG) - bitcoin gold testnet
* `DIGIBYTE_TESTNET` (tDGB) - digibyte testnet
* `DGB_SEGWIT_TESTNET` (tDGB) - digibyte segwit testnet
* `RVN_TESTNET` (tRVN) - ravencoin testnet

### **Parameters**

| Parameter   | Type                                            | Description                     |
| ----------- | ----------------------------------------------- | ------------------------------- |
| coinType    | `CoinType`                                      | bitcoin coin type.              |
| transaction | [BitCoinTransaction](#class-bitcointransaction) | bitcoin transaction parameters. |

#### **class BitCoinTransaction**

This class to be used for bitcoin transaction.

<table><thead><tr><th width="167.33333333333331">Name</th><th>Type</th><th>Description</th></tr></thead><tbody><tr><td>version</td><td><code>int</code></td><td>version of bitcoin transaction. Currently 1<br>- <code>BCH</code> / <code>Dash</code> /<code>BTG</code> -> <code>2</code><br>- <code>ZCASH</code> -> <code>4</code></td></tr><tr><td>input</td><td><code>List&#x3C;</code><a href="#class-unspenttransactionoutput"><code>UnspentTransactionOutput</code></a><code>></code></td><td>previous transaction output information to be used</td></tr><tr><td>output</td><td><code>List&#x3C;</code><a href="#class-transactionoutput"><code>TransactionOutput</code></a><code>></code></td><td>coin spending information</td></tr><tr><td>locktime</td><td><code>int</code></td><td>locktime for this transaction</td></tr><tr><td>optionParam</td><td><code>String</code></td><td>(optional)option parameter</td></tr></tbody></table>

#### **class UnspentTransactionOutput**

The class for previous transaction output information to be used for bitcoin network transaction.

<table><thead><tr><th width="148.33333333333331">Name</th><th width="168">Type</th><th>Description</th></tr></thead><tbody><tr><td>prev_tx</td><td><code>String</code></td><td>full of previous transaction data</td></tr><tr><td>utxo_idx</td><td><code>int</code></td><td>index of previous transaction output to be sent</td></tr><tr><td>type</td><td><code>String</code></td><td>bitcoin transaction type for this UTXO</td></tr><tr><td>key</td><td><code>Bip44KeyPath</code></td><td>BIP44 key path for unlocking UTXO</td></tr></tbody></table>

#### class TransactionOutput

The class for coin spending information of Bitcoin network Transaction

<table><thead><tr><th width="121.33333333333331">Name</th><th width="175">Type</th><th>Description</th></tr></thead><tbody><tr><td>value</td><td><code>long</code></td><td>amount of coin to spend. Satoshi unit.</td></tr><tr><td>to</td><td><code>List&#x3C;String></code></td><td>if <code>type</code> is <code>p2pkh</code> or <code>p2sh</code>, Base58Check encoded address of the receiver.<br>The value of the field may follow the rule of version prefix.(<code>BITCOIN_BASE58CHECK</code>)<br>if the type is <code>p2pk</code>, Base58Check encoded non-compressed public key without version prefix.<br>if the type is <code>multisig</code>, Base58Check encoded non-compressed public key (without version prefix) list.<br>if the type is <code>change</code>, BIP44 formatted PATH to get change address. In this case, the transaction type is assumed as <code>p2pkh</code></td></tr><tr><td>type</td><td><code>String</code></td><td>bitcoin network transaction type or this field can indicate output as a <code>change</code></td></tr></tbody></table>

### **Returns**

`String` - signed transaction.j

### **Requirements**

* Refer to [D\`CENT Firmware Update History](https://dcentwallet.com/support/FirmwareUpdate) to determine which D'CENT Biometric Wallet versions are supported on each network.

**Example**

```java
UnspentTransactionOutput utxo = new UnspentTransactionOutput("01000000012b09bd990adc6792588225486c336fb2090890341fcbc6ae92c440c3bd266b98010000006a47304402201df6bd2294f9d51496c1be7ea09431fcfee4b0ca9359712c2c381aff9b2d6f070220595a5bb4e9f0f0d1f5fb9a800224c01ac99058d9b491cd7e6a60145bbd26ddca0121028cbb73e589f81937784eaf728cd14ad27984e5415766c04408211af8d9e30ee7ffffffff0127810000000000001976a9141c7254fac600ef7371664a613f0323c6c641cbd288ac00000000", 0, BitCoinTransaction.TxType.p2pkh, Bip44KeyPath.valueOf("m/44'/0'/0'/0/0")) ;

List<UnspentTransactionOutput> input = new ArrayList<>();
input.add(utxo) ;

TransactionOutput txo = new TransactionOutput(10000, Arrays.asList(new String[]{"1Ckii7MpiquSxcmo2ch1UTfQMConz31rpB"}), BitCoinTransaction.TxType.p2pkh  ) ;
List<TransactionOutput> output = new ArrayList<>();
output.add(txo) ;

BitCoinTransaction bitCoinTransaction = new BitCoinTransaction.Builder()
                .version(1)
                .input(input)
                .output(output)
                .locktime(0)
                .build();

String response = mDcentManager.getBitcoinSignedTransaction(CoinType.BITCOIN, bitCoinTransaction);
```


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