Bitcoin

getBitcoinSignedTransaction

The DCENT Android SDK provides functions for signing transaction of coins.

This function is 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 testnet
• 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)- bitcoin 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	bitcoin transaction parameters.

class BitCoinTransaction

This class to be used for bitcoin transaction.

Name	Type	Description
version	int	version of bitcoin transaction. Currently 1 - BCH / Dash /BTG -> 2 - ZCASH -> 4
input	List<UnspentTransactionOutput>	previous transaction output information to be used
output	List<TransactionOutput>	coin spending information
locktime	int	locktime for this transaction
optionParam	String	(optional)option parameter

class UnspentTransactionOutput

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

Name	Type	Description
prev_tx	String	full of previous transaction data
utxo_idx	int	index of previous transaction output to be sent
type	String	bitcoin transaction type for this UTXO
key	Bip44KeyPath	BIP44 key path for unlocking UTXO

class TransactionOutput

The class for coin spending information of Bitcoin network Transaction

Name	Type	Description
value	long	amount of coin to spend. Satoshi unit.
to	List<String>	if type is p2pkh or p2sh, Base58Check encoded address of the receiver. The value of the field may follow the rule of version prefix.(BITCOIN_BASE58CHECK) if the type is p2pk, Base58Check encoded non-compressed public key without version prefix. if the type is multisig, Base58Check encoded non-compressed public key (without version prefix) list. if the type is change, BIP44 formatted PATH to get change address. In this case, the transaction type is assumed as p2pkh
type	String	bitcoin network transaction type or this field can indicate output as a change

Returns

String - signed transaction.

Requirements

• Refer to D`CENT Firmware Update History to determine which DCENT Biometric Wallet versions are supported on each network.

Example

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);