# Tezos (XTZ & XTZ\_FA)

## Sign Transaction

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

### **getTezosSignedTransaction()**

#### Supported Coin Type

* TEZOS (XTZ)
* TEZOS Token (XTZ\_FA)

#### Parameters 

* unsignedTx: unsigned hexadecimal tx [Tezos Docs](https://tezostaquito.io/docs/quick_start)
* path: key path, wallet sign with that private key with a given key path (BIP32 ex) "m/44'/1729'/0'/0/0").
* fee: fee, It is fee that wallet displays on the screen.
* symbol: symbol, It is a symbol that the wallet displays on the screen.
* decimals: tezos or tezos token's decimals.

#### Requirements

* `D'CENT Bridge` version 1.5.0 or higher is required.
* D'CENT Biometric Wallet version 2.24.1 or higher is required.

#### Useage 

```javascript
import { TezosToolkit, Estimate } from '@taquito/taquito'
import * as tezosUtils from '@taquito/utils'
import { Tzip12Module, tzip12 } from '@taquito/tzip12'
import BigNumber from 'bignumber.js'

const Tezos = new TezosToolkit('https://YOUR_PREFERRED_RPC_URL');
const TezosContext = Tezos._context

// https://github.com/ecadlabs/taquito/blob/3640373e5acd160767234e10bab4fe18ac3cb586/packages/taquito/src/prepare/prepare-provider.ts#L868

const BlockHash = await TezosContext.readProvider.getBlockHash('head~2')
const BlockProto = await TezosContext.readProvider.getNextProtocol('head')
const counter = Number(await TezosContext.readProvider.getCounter(account.recvAddress, 'head'))

let ops = []
ops.push({
    kind: 'transaction',
    fee,
    amount: DcentWebConnector.unitConverter(amount, decimals).num.toString(),
    gas_limit,
    storage_limit,
    destination: toAddr,
    counter: (counter + 1 + index).toString(),
    source: recvAddress,
})

const prepared = {
    opOb: {
      branch: BlockHash,
      contents: ops,
      protocol: BlockProto
    },
    counter: counter
  }
const forgedBytes = await Tezos.estimate.forge(prepared)

const sigHash = '03' + forgedBytes.opbytes

const transactionJson = {
    coinType: DcentWebConnector.coinType.TEZOS,
    sigHash: sigHash,
    path: `m/44'/1729'/0'/0/0`,
    decimals, // 6,
    fee: fee,
    symbol: 'XTZ',
}

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

#### Returned response object

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


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