Ethereum & EVM compatible

getEthereumSignedTransaction

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

This function is for:

• ETHEREUM (ETH) - ethereum
• ETH_CLASSIC (ETC) - ethereum classic
• ETHEREUM_GOERLI (ETHt) - ethereum goerli
• FLARE_COSTON (CFLR) - flare network coston
• RSK (RBTC)- rsk smart bitcoin
• RSK_TESTNET (RBTCt) - rsk smart bitcoin testnet
• XDC (XDC) - xdc network
• XDC_APOTHEM (XDCt) - xdc apothem
• BSC (BNB) - binance smart chain
• BSC_TESTNET (BNBt) - binance smart chain testnet
• POLYGON (MATIC) - polygon
• POLYGON_TESTNET (MATICt) - polygon testnet
• ETH_CHAIN - other evm networks

Parameters

Parameter	Type	Description
coinType	CoinType	ethereum coin type.
transaction	EthereumTransanction	ethereum transaction parameters.

class EthereumTransanction

Name	Type	Description
hdKeyPath	Bip44KeyPath	sign key path for ethereum transaction
nonce	String	account nonce for ethereum transaction
toAddr	String	recipient's address of ethereum transaction
amount	String	amount of ether to be sent. ( WEI unit value )
gasLimit	String	gas limit value of ethereum transaction
gasPrice	String	gas price for ethereum transaction
data	String	transaction data of ethereum transaction
chainId	String	chain id
symbol	String	symbol of contract for ethereum transaction
tx_type	byte	(optional)Type of ethereum transaction
max_priority_fpg	String	(optional)max_priority_fpg of ethereum transaction
max_fee_per_gas	String	(optional)max_fee_per gas of ethereum transaction
access_list	String	(optional)access_list of ethereum transaction

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

EthereumTransanction ethereumTransanction;
ethereumTransanction = new EthereumTransanction.Builder()
                .keyPath(Bip44KeyPath.valueOf("m/44'/60'/0'/0/0"))
                .nonce("14")
                .toAddr("0xe5c23dAa6480e45141647E5AeB321832150a28D4")
                .amount("500000000000000")
                .gasLimit("21000")
                .gasPrice("6000000000")
                .data("0x")
                .chainId("1")
                .symbol("ETH")
                .build();
String response = mDcentmanager.getEthereumSignedTransaction(CoinType.ETHEREUM, ethereumTransanction);

getTokenSignedTransaction

This function is for:

• ERC20 - ethereum erc20 token
• ETC_ERC20 - ethereum classic erc20 token
• ERC20_KOVAN - ethereum kovan erc20 token
• ERC20_ROPSTEN - ethereum ropsten erc20 token
• ERC20_GOERLI - ethereum goerli erc20 token
• ERC20_RINKEBY - ethereum rinkeby erc20 token
• FRC20_COSTON - flare network coston token
• RRC20 - rsk smart bitcoin token
• RRC20_TESTNET - rsk smart bitcoin testnet token
• XRC20 - xdc xrc20 token
• XRC20_APOTHEM - xdc apothem xrc20 token
• BSC_BEP20 - binance smart chain bep20 token
• BSC_BEP20_TESTNET - binance smart chain bep20 testnet token
• POLYGON_ERC20 - polygon erc20 token
• POLYGON_ERC20_TESTNET - polygon erc20 testnet token
• ECH_ERC20 - other evm erc20 token

Parameters

Parameter	Type	Description
coinType	CoinType	erc20 type.
transaction	TokenTransaction	token transaction parameters.

class TokenTransaction

Name	Type	Description
hdKeyPath	Bip44KeyPath	sign key path for ethereum transaction
nonce	String	account nonce for ethereum transaction
toAddr	String	address to send
amount	String	amount of ETH to send
gasLimit	String	gas limit value
gasPrice	String	gas price for ethereum transaction
tokenName	String	token name of contract for ERC20 transaction
contractAddress	String	address of contract for ERC20 transaction
decimals	String	decimals of contract for ERC20 transaction
symbol	String	symbol of contract for ERC20 transaction
chainId	String	chain id
feeSymbol	String	symbol of fee Account for ERC20 transaction

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

TokenTransaction erc20transaction;
erc20transaction = new TokenTransaction.Builder()
                .keyPath(Bip44KeyPath.valueOf("m/44'/60'/0'/0/0"))
                .nonce("14")
                .toAddr("0xe5c23dAa6480e45141647E5AeB321832150a28D4")
                .amount("60000000000000000")
                .gasLimit("70000")
                .gasPrice("3000000000")
                .tokenName("OmiseGO")
                .contractAddress("0xd26114cd6ee289accf82350c8d8487fedb8a0c07")
                .decimals("18")
                .symbol("OMG")
                .chainId("1")
                .feeSymbol("ETH")
                .build();

String response = mDcentmanager.getTokenSignedTransaction(CoinType.ERC20, erc20transaction)

getEthereumMessageSigned

Get the sign value of "EVM" message sign(personal_sign & signTypedData).

This function is for:

• ETHEREUM (ETH) - ethereum
• ETHEREUM_GOERLI (ETHt) - ethereum goerli
• RSK (RBTC)- rsk smart bitcoin
• RSK_TESTNET (RBTCt) - rsk smart bitcoin testnet
• XDC (XDC) - xdc network
• XDC_APOTHEM (XDCt) - xdc apothem
• BSC (BNB) - binance smart chain
• BSC_TESTNET (BNBt) - binance smart chain testnet
• POLYGON (MATIC) - polygon
• POLYGON_TESTNET (MATICt) - polygon testnet
• ETH_CHAIN - other evm networks
• KLAYTN (KLAY) - klaytn
• KLAY_BAOBAB (KLAYt) - klaytn baobab

Parameters

Parameter	Type	Description
coinType	CoinType	coin type.
transaction	EthMesageSignData	ethereum message sign data parameters.
command	String	data sign command.("msg_sign" | "sign_data") - "msg_sign" for personal_sign or 'eth_sign' of EVM - "sign_data" for signTypedData(EIP-712) of EVM

class EthMesageSignData

Name	Type	Description
hdKeyPath	Bip44KeyPath	sign key path for ethereum sign data transaction
data	String	message for signing

Returns

HashMap<String, String> - signedData{address,sign}

Requirements

• DCENT Biometric Wallet version 1.3.0. or higher is required.
  • (for EIP-712) version 2.11.1. or higher is required.

Example(ethereum personal_sign)

EthMesageSignData ethMesageSignData;
ethMesageSignData = new EthMesageSignData.Builder()
                    	.keyPath(Bip44KeyPath.valueOf("m/44'/60'/0'/0/0"))
                    	.data("Message Sign TEST")
                    	.build();
HashMap<String, String> response = mDcentmanager.getEthereumMessageSigned(CoinType.ETHEREUM, ethMesageSignData, "msg_sign");
String address = response.get("address");
String sign = response.get("sign");