# Hedera (HBAR & HTS)

## Get Public Key

In order to get public key for Hedera Account, you can use `getAddress()` function.

If you use `DcentWebConnector.coinType.HEDERA` as a coinType parameter for `getAddress()` function, you can get public key for the private key of the BIP44 path.

For more detail about `getAddress()`, please see the below section.

* go to [Get Address API](https://dev-docs.dcentwallet.com/dcent-biometric-wallet-for-pc/address-and-xpub#get-address) description

## Sign Transaction

### **Supported Transaction Types**

<table><thead><tr><th width="259.3893925964739">Transaction</th><th width="150" align="center">Supported</th><th width="150">Group</th></tr></thead><tbody><tr><td>AccountCreateTransaction</td><td align="center">O</td><td>Accounts</td></tr><tr><td>AccountUpdateTransaction</td><td align="center">O</td><td>Accounts</td></tr><tr><td>TransferTransaction</td><td align="center">O</td><td>Accounts</td></tr><tr><td>AccountDeleteTransaction</td><td align="center">X</td><td>Accounts</td></tr><tr><td>AccountAllowanceApprovalTransaction</td><td align="center">X</td><td>Accounts</td></tr><tr><td>AccountAllowanceAdjustTransaction</td><td align="center">X</td><td>Accounts</td></tr><tr><td>TokenCreateTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenUpdateTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenDeleteTransaction</td><td align="center">X</td><td>Token</td></tr><tr><td>TokenAssociateTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenDissociateTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenMintTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenBurnTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenFreezeTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenFeeScheduleUpdateTransaction</td><td align="center">X</td><td>Token</td></tr><tr><td>TokenUnfreezeTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenGrantKycTransaction</td><td align="center">X</td><td>Token</td></tr><tr><td>TokenRevokeKycTransaction</td><td align="center">X</td><td>Token</td></tr><tr><td>TokenPauseTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenUnpauseTransaction</td><td align="center">O</td><td>Token</td></tr><tr><td>TokenWipeTransaction</td><td align="center">O</td><td>Token</td></tr></tbody></table>

For your reference, all transaction types for Hedera can be found here.

* <https://docs.hedera.com/guides/docs/sdks/transactions>

### **getHederaSignedTransaction()**

#### Supported Coin Type

* Hedera(HTS)

#### Parameters :

* unsignedTx: unsigned hexadecimal tx [Hedera Docs](https://docs.hedera.com/guides/getting-started/transfer-hbar)
* path: key path, wallet sign with that private key with a given key path (BIP32 ex) "m/44'/144'/0'").
* symbol: symbol, It is a symbol that the wallet displays on the screen.
* decimals: hedera or hts token's decimals.

#### Requirements:

* `D'CENT Bridge` version 1.2.1 or higher is required.
* D'CENT Biometric Wallet version 2.19.3. or higher is required.
* This feature is tested with [Hedera JavaScript SDK](https://github.com/hashgraph/hedera-sdk-js) v2.8.0

#### Usage:

```javascript
const _buf2hex = (buffer) => { // buffer is an ArrayBuffer
return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' + x.toString(16)).slice(-2)).join('');
}
const client = HederaSDK.Client.forMainnet()
const nodeList = client._network.getNodeAccountIdsForExecute()
const validStart = Timestamp.generate()
const fromAccountId = AccountId.fromString('accountIdString')
const txId = new TransactionId(fromAccountId, validStart)
const tx = new HederaSDK.TransferTransaction()

// when you transfer hbar
tx.addHbarTransfer(fromAccountId, HederaSDK.Hbar.fromTinybars('-' + amountTinybar))
tx.addHbarTransfer('toAccountIdString', HederaSDK.Hbar.fromTinybars(amountTinybar))

// or you can transfer token like this.
tx.addTokenTransfer(contractAddress, fromAccountId, HederaSDK.Hbar.fromTinybars('-' + amountTinybar))
tx.addTokenTransfer(contractAddress, 'toAccountIdString', HederaSDK.Hbar.fromTinybars(amountTinybar))


tx.setNodeAccountIds([nodeList[nodeList.length - 1]])
tx.setTransactionId(txId)
tx.setTransactionMemo('')
tx.setMaxTransactionFee(fee)
tx.freezeWith(client)

const bodyBytes = tx._signedTransactions[0].bodyBytes
const unsignedTx = _buf2hex(bodyBytes)

const transactionJson = {
    unsignedTx: unsignedTx,
    path: `m/44'/3030'/0'`,
    symobl: HBAR,
    decimals: 8,
}

var result
try {
    result = await DcentWebConnector.getHederaSignedTransaction(transactionJson);    
} catch (e) {
    console.log(e)
    result = e
}
```

#### Returned response object:

```json
{
    "header": {
        "version": "1.0",
        "response_from": "hedera",
        "status": "success"
    },
    "body": {
        "command": "transaction",
        "parameter": {
            "signed_tx": "0x31aa13b5e04cb6fc6381ea0520bf7f6727ebdb6e96cd7ca8625bb3e3dd36cf0e2cee4ece13aa9f7ddc09ee10c74aa00af954201829d8016317f10f5a921dcc0d",
            "pubkey": "0x9a5c753d02038e512c06867556324b37181c9c1fc19c21c27752c520e8f0d822"
        }
    }
}
```