# Cosmos & Cosmos compatible network

## Sign Transaction

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

### **getCosmosSignedTransaction()**

#### Supported Coin Type

* COSMOS(ATOM)
* COREUM(CORE)

#### Parameters 

* unsignedTx: unsigned hexadecimal tx [Cosmos Docs](https://github.com/cosmostation/cosmosjs)
* path: key path, wallet sign with that private key with a given key path (BIP32 ex) "m/44'/118'/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: cosmos or coreum's decimals.

#### Requirements

* `D'CENT Bridge` version 1.5.0 or higher is required.
* D'CENT Biometric Wallet version 2.21.0 or higher is required.
  * COREUM: 2.25.0 or higher is required.

#### Useage 

```javascript
import message from "@cosmostation/cosmosjs/src/messages/proto";

// signDoc = (1)txBody + (2)authInfo
// ---------------------------------- (1)txBody ----------------------------------
const pubKeyAny = new message.google.protobuf.Any({
      type_url: '/cosmos.crypto.secp256k1.PubKey',
      value: Buffer.from('0a21ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff', 'hex') //temp value
})
const msgSend = new message.cosmos.bank.v1beta1.MsgSend({
  from_address: recAddress,
  to_address: toAddress,
  amount: [{ denom: "uatom", amount: String(100000) }]        // 6 decimal places (1000000 uatom = 1 ATOM)
});

const msgSendAny = new message.google.protobuf.Any({
  type_url: "/cosmos.bank.v1beta1.MsgSend",
  value: message.cosmos.bank.v1beta1.MsgSend.encode(msgSend).finish()
});

const txBody = new message.cosmos.tx.v1beta1.TxBody({ messages: [msgSendAny], memo: "" });

// --------------------------------- (2)authInfo ---------------------------------
const signerInfo = new message.cosmos.tx.v1beta1.SignerInfo({
  public_key: pubKeyAny,
  mode_info: { single: { mode: message.cosmos.tx.signing.v1beta1.SignMode.SIGN_MODE_DIRECT } },
  sequence // nonce
});

const feeValue = new message.cosmos.tx.v1beta1.Fee({
  amount: [{ denom: "uatom", amount: String(5000) }],
  gas_limit: 200000
});

const authInfo = new message.cosmos.tx.v1beta1.AuthInfo({ signer_infos: [signerInfo], fee: feeValue });
const bodyBytes = message.cosmos.tx.v1beta1.TxBody.encode(txBody).finish()
const authInfoBytes = message.cosmos.tx.v1beta1.AuthInfo.encode(authInfo).finish()
const signDoc = new message.cosmos.tx.v1beta1.SignDoc({
  body_bytes: bodyBytes,
  auth_info_bytes: authInfoBytes,
  chain_id,
  account_number,
})
let signMessage = message.cosmos.tx.v1beta1.SignDoc.encode(signDoc).finish()

const sigHash = Buffer.from(signMessage).toString('hex')

const transactionJson = {
  coinType: DcentWebConnector.coinType.COSMOS, // or COREUM
  sigHash: sigHash,
  path: `m/44'/118'/0'/0/0`, // (COREUM -> m/44'/990'/0'/0/0)
  decimals, // 6
  fee,
  symbol: 'ATOM', // (COREUM -> CORE)
}

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

#### Returned response object

```json
{
  "header": {
    "version": "1.0",
    "response_from": "cosmos",
    "status": "success"
  },
  "body": {
    "command": "transaction",
    "parameter": {
    "signed_tx": "0x31aa13b5e04cb6fc6381ea0520bf7f6727ebdb6e96cd7ca8625bb3e3dd36cf0e2cee4ece13aa9f7ddc09ee10c74aa00af954201829d8016317f10f5a921dcc0d",
    "pubkey": "0x0202903dcb31139bf92e096c3ec85fb9a94ab7dbf02d6234ded604d15ee9650480"
    }
  }
}
```


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