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Bitcoin has a history of more than ten years since its inception. Due to its decentralization, globalization, low transaction costs, and anonymity, it has been favored by financial investors.

      Bitcoin, as the world's most influential and well-known digital currency, can make the interconnection of everything easier to achieve through value transmission.

      For example, in the field of cross-border settlement, compared with traditional multinational bank wire transfers, Bitcoin payment transfers are faster and more convenient. The time it takes is only the confirmation time on the chain, investors can transfer Bitcoin assets to any place in the world. people.

      The number of Bitcoin has been halved, and its mining difficulty has also increased. The demand around the world is increasing. Therefore, its stable legal currency characteristics + strong demand and continuous recognition by the mainstream society have made the value of Bitcoin continue to rise. Investment attributes are becoming more prominent.

      Therefore, the most widely used field of Bitcoin is the digital currency trading platform, which gains profits by buying up and down in the trading platform.

      How to build a Bitcoin payment interface to realize the payment and transfer of Bitcoin on the trading platform? How to access the Bitcoin payment interface to realize quick access to the deposit and withdrawal of Bitcoin?

      The continuous flow of funds into the trading platform, the demand for Bitcoin deposits and withdrawals and the security of platform digital assets are important issues that many platform operators have to deal with with caution.

      The wallet management system is an important part of the exchange ecosystem, but the wallet management system for business systems like exchanges involves security, cross-chain integration, huge data volume, and complex business requirements (address generation, address generation, etc.). Management, fund management, transaction record management, deposit and withdrawal, callback, etc.), the development difficulty coefficient is relatively large.

 The emergence of Udun Wallet has made the implementation of a mature enterprise-level digital asset management system a reality. Take Udun Wallet as an example to discuss how to build a btc payment interface.

The detailed wallet interface documents are as follows:

Original link: https://www.uduncloud.com/gateway-interface

1. Directory

1.1. Generate addresses
1.2. Withdrawal
1.3. Payment on behalf
1.4. Trade callback
1.5. Verify address legality
1.6. Obtain the information of tokens supported by merchants

2. Interface details

1. Generate addresses

1.1 Scenario description

Request the address of the designated tokens. Tokens must be saved in the wallet and supported by the wallet in order to get the address successfully, For more information, please refer to

1.2. Interface details

1.2.1 Interface addresses

1.2.2 Parameters

1.2.2.1 Parameter description

[

    {

     "merchantId":"300015",

     "coinType":520,

     "callUrl":"http://localhost:8080/callBack"

    }

]

1.2.2.2 Body parameter field

1.2.2.3 Examples

{

    "timestamp": 1535005047,

    "nonce": 10000,

    "sign": "a230def43c1a12b14393880a28d4e005",

"body": "[{\"merchantId\":\"300015\",\"coinType\":520,\"callUrl\":\"http://localhost:8080/callBack\"}]"

}

1.2.3 Return to status code

1.3 Call examples

1.3.1 Success

{

    "data":{

        "coinType":520,

        "address":"0xbe4e3699cb870bc95365fe04a187dd279a651a58"

    },

    "message":"SUCCESS",

    "code":200

}

1.3.2 Failure

{

    "code": "4101",

"message": "SIGN_MSG_ERROR"

}

2、Send withdrawal application

2.1 Scenario description

Withdrawal application

2.2 Interface details

2.2.1 Interface address

2.2.2 Parameters

2.2.2.1 Parameter description

[

    {

        "address":"raadSxrUhG5EQVCY75CSGaVLWCeXd6yH6s",

        "amount":"0.11",

        "merchantId":"100109",

        "mainCoinType":"144",

        "coinType":"144",

        "callUrl":"http://localhost:8080/mch/callBack",

        "businessId":"15",

        "memo":"10112"

    }

]

2.2.2.2 Body parameter field

2.2.2.3 Examples

{

  "timestamp": 1535005047,

  "nonce": 100000,

  "sign": "6df1512ee650431632ce1541a6b064e1",

  "body": "[{\"address\":\"raadSxrUhG5EQVCY75CSGaVLWCeXd6yH6s\",\"amount\":\"0.11\",\"merchantId\":\"100109\",\"mainCoinType\":\"144\",\"coinType\":\"144\",\"callUrl\":\"http://localhost:8080/callBack\",\"businessId\":\"15\",\"memo\":\"10112\"}]"

}

2.2.3 Return to status code

2.3 Call examples

2.3.1 Success

{

    "message":"SUCCESS",

    "code":200

}

2.3.2 Failure

{

    "code": "4101",

    "message": "SIGN_MSG_ERROR"

}

3、Payment on behalf

3.1 Scenario description

Payment on behalf. Send automatic payment application and if payment on behalf information is not set or payment on behalf fails, it will enter the audit status.

3.2 Interface details

3.2.1 Interface address

3.2.2 Parameters

3.2.2.1 Parameter description

[

  {

      "address":"raadSxrUhG5EQVCY75CSGaVLWCeXd6yH6s",

      "amount":"0.1",

      "merchantId":"100146",

      "mainCoinType":"144",

      "coinType":"144",

      "callUrl":"http://localhost:8080/callBack",

      "businessId":"571001",

      "memo":"10112"

  }

]

3.2.2.2 Body parameter description

3.2.2.2 Examples

{

    "timestamp": 1535005047,

    "nonce": 100000,

    "sign": "e1bee3a417b9c606ba6cedda26db761a",

    "body": "[{\"address\":\"raadSxrUhG5EQVCY75CSGaVLWCeXd6yH6s\",\"amount\":\"0.1\",\"merchantId\":\"100146\",\"mainCoinType\":\"144\",\"coinType\":\"144\",\"callUrl\":\"http://localhost:8080/callBack\",\"businessId\":\"571001\",\"memo\":\"10112\"}]"

}

3.2.3 Return to status code

3.3 Call examples

3.3.1 Success

{

    "message":"SUCCESS",

    "code":200

}

3.3.2 Failure

{
"code": "4101",
"message": "SIGN_MSG_ERROR"
}

4、Trade callback interface

4.1 Scenario description

The gateway receives the transaction processing result and calls the callback interface provided by the merchant to notify the merchant of the specific change information. The interface gateway sends you the content of the callback address specified by you to process your business information. There are callbacks for deposit and withdrawal, of which up to two callbacks will be made for withdrawals (audit callback and transaction result callback)

4.2 Interface details

4.2.1 Interface address

4.2.2 Parameters

4.2.2.1 Parameter description

{

    "address":"DJY781Z8qbuJeuA7C3McYivbX8kmAUXPsW",

    "amount":"12345678",

    "blockHigh":"102419",

    "coinType":"206",

    "decimals":"8",

    "fee":"452000",

    "mainCoinType":"206",

    "status":3,

    "tradeId":"20181024175416907",

    "tradeType":1,

    "txId":"31689c332536b56a2246347e206fbed2d04d461a3d668c4c1de32a75a8d436f0",

"businessId":"",// The coin withdrawal callback is the business id passed from the coin withdrawal interface, and the coin has no value.

 "memo":""

}

4.2.2.2 Body parameter description

4.2.2.2 Examples

{

    "timestamp": 1535005047,

    "nonce": 100000,

    "sign": "e1bee3a417b9c606ba6cedda26db761a",

    "body": "{\"address\":\"DJY781Z8qbuJeuA7C3McYivbX8kmAUXPsW\",\"amount\":\"12345678\",\"blockHigh\":\"102419\",\"coinType\":\"206\",\"decimals\":\"8\",\"fee\":\"452000\",\"mainCoinType\":\"206\",\"status\":3,\"tradeId\":\"20181024175416907\",\"tradeType\":1,\"txId\":\"31689c332536b56a2246347e206fbed2d04d461a3d668c4c1de32a75a8d436f0\"}"

}

5、Verify address legality

5.1 Scenario description

Check the legality of the address. You can check the legality of the address first when adding addresses, withdrawing coins and other scenarios, see Verification rule

5.2 Interface details

5.2.1 Interface address

5.2.2 Parameters

5.2.2.1 Parameter description

{

    "merchantId":200000,

    "mainCoinType":"206",

    "address":"DJY781Z8qbuJeuA7C3McYivbX8kmAUXPsW"

}

5.2.2.2 Body parameter description

5.2.2.2 Examples

{

    "timestamp": 1535005047,

    "nonce": 100000,

    "sign": "e1bee3a417b9c606ba6cedda26db761a",

    "body": "[{\"merchantId\":200000,\"mainCoinType\":\"206\",\"address\":\"DJY781Z8qbuJeuA7C3McYivbX8kmAUXPsW\"}]"

5.2.3 Return to status code

5.3 Call examples

5.3.1 Success

{

    "code":200,

    "message":"SUCCESS"

}

5.3.2 Failure

{

    "code":4005,

    "message":"PARAM_ERROR"

}

6、Obtain the information of tokens supported by merchants

6.1 Scenario description

Obtain the tokens supported by merchants and the balance

6.2 Interface details

6.2.1 Interface address

6.2.2 Parameters

6.2.2.1 Parameter description

6.2.2.2 Body parameter description

6.2.2.3 Examples

{

    "timestamp": 1535005047,

    "nonce": 100000,

    "sign": "e1bee3a417b9c606ba6cedda26db761a",

    "body": "{\"merchantId\":\"200032\",\"showBalance\":true}"

}

6.2.3 Return to status code

6.3 Call examples

6.3.1 Success

{

"code":200,

"message":"SUCCESS",

"data":[

{

"name":"BTC", // Coin alias

"coinName":"Bitcoin", // Full name of the coin

"symbol":"BTC", // Coin unit

"mainCoinType":"0", //Main coin type

"coinType":"0", // Coin type

"decimals":"8", // Coin precision

"tokenStatus":"0", // 0： Main coin 1：Token

"mainSymbol":"BTC", //Main coin unit

"balance":"0", // Balance

"logo":"http://bipay-admin.oss-cn-hangzhou.aliyuncs.com/bipay-admin-release/coin-logo/BTC.png" // Coin log address

},

{

"name": "ETH", // Coin alias

"coinName":"Ethereum", // Full name of the coin

"symbol":"ETH", // Coin unit

"mainCoinType":"60", //Main coin type

"coinType":"60", // Coin type

"decimals":"18", // Coin precision

"tokenStatus":"0", // 0： Main coin 1：Token

"mainSymbol":"ETH", //Main coin unit

"balance":"0", // Balance

"logo":"https://bipay-admin.oss-cn-hangzhou.aliyuncs.com/bipay-admin-release/coin-logo/ETH.png" // Coin log address

}

]

}

6.3.2 Failure

{

"code":4005,

"message":"BGS_ILLEGAL_PARAMETER"

}

Appendix one

Callback interface status description

Callback interface transaction type description

Verification description

In order to ensure that the parameter information transmitted by merchants to Udun will not be tampered maliciously, the gateway provides MD5 encrypted digest authentication for merchant interface. The merchant can use basic encryption parameters: time stamp, random number, signature key (the merchant's unique apikey) and request plaintext parameters to perform MD5 encryption in the specified order to generate a verification string sign. When the merchant requests the gateway interface, it takes time stamp, random number, request of plaintext parameter and sign as parameters. The gateway gets the corresponding parameters and checks the signature in the same way. Similarly, the gateway requests the merchant to verify in the same way.
sign=md5(body + key + nonce + timestamp)
Key is the interface authorization code APIKEY, which is assigned to the merchant by the gateway, and the order of the encrypted fields cannot be wrong.

Coin address verification rules

As the creator of cryptocurrency, Bitcoin has the widest audience and the most trusted, but its disadvantages are the large amount of block data, slow synchronization, and long transaction confirmation time.

      General exchanges will not develop a separate wallet system by themselves. Not only is the data of block nodes such as Bitcoin huge and slow synchronization transmission, but also the cost of server and bandwidth is relatively high. The most important thing is that you can't afford such a technical team! The private key of the native wallet is very insecure on the server.

      Standard Bitcoin payment interface documents are provided by Udun Wallet, which can realize quick access to deposit and withdrawal of Bitcoin. There is no restriction on the language of the trading platform system. Any language can be docked without deploying a node server. The docking can be completed in a few minutes. Trading platform, public key derived address, private key cold storage, double encryption method to prevent the risk of losing coins due to hacker attacks.

     Udun Wallet, as the world's first open enterprise-level wallet solution. It has been safely operated for 800days+, with a daily deposit and withdrawal of 20 million US dollars and 2000+ registered users. Redefine the digital asset wallet with safe and complete technology, and provide API access for more than 100 currencies such as Bitcoin and Ethereum; the top private key BOSS is autonomously controlled, the sub-private key dynamic calculation does not touch the network, hardware blessing, pure cold operation ; Multi-level financial review strategy, asset trends, operation logs are clear at a glance; massive addresses are managed in a unified way, and the balance is automatically collected with one click.

Anti-hacking technology:

①API interface information access verification, secure transmission based on HTTPS, and refuse to be monitored;

②The private key is not uploaded or touched the Internet, and is hosted on the client side through secondary encryption;

③The wallet binds the computer MAC address and denies access to non-authenticated devices;

④The hot and cold wallets are separated, and large assets are stored offline in the cold wallet;

Anti-ghost technology:

① One-key setting of staff operation authority by administrator;

②One-key query of staff operation records by the administrator;

③Employees only contact and manage independent small sub-wallets;

④Excess transfer-out transactions need to be reviewed by the administrator;

⑤The administrator's consent is required for employees to log in to Udun account on non-company-designated computer equipment;

Convenient access:

① No node synchronization;

②Standard interface;

③Detailed interface documents;

④Access to DEMO;

⑤ 7*24 hours technical support.