Request a specific transaction from the blockchain.
Introduction
For illustration purposes, we’ll request a transaction in the blockchain using the cURL tool information on cURL: Wikipedia
The following code will retrieve a transaction from the Credits blockchain with the given TransactionID :7885122.1 on Testnet.
We are using the “GetTransactionInfo()” function which is explained here: GetTransactionInfo.
Description of cURL parameters
X POST - type of HTTP request, in this case we use POST. More info here: Wikipedia
-H “accept: application/json”
-H “Content-Type: application/json” - Specification for the transferred parameters and response to be in JSON format
-d {parameters} - With this key, we specify the data transferred with the request. Let’s look at them in more detail:
“authKey”: “” - Authorization key. Not used at present, should be passed “”
“networkAlias”: “TestNet” - We specify the network, where the request should be executed. Either TestNet or MainNet.
"Compressed": "true" - Here we specify the compression of the information that is send back to us.
“TransactionId”: "7885122.1" - We specify the transaction number which we want to retrieve from the blockchain
"methodApi": "GetBalance"
For CMD to overlook quotation marks “ inside the request body since those are special characters, they should be escaped with the backward slash .
Code
Let's try it out with the following code !
curl -X POST "http://apinode.credits.com/api/Monitor/GetTransactionInfo" -H "accept: application/json" -H "Content-Type: application/json" -d "{\"authKey\":\"\",\"networkAlias\":\"TestNet\", \"Compressed\": true, \"TransactionId\":\"7885122.1\",\"methodApi\":\"GetTransactionInfo\"}"Response
We get the following response from the REST API in JSON.
{ "id":"7885122.1", - Transaction identifier "fromAccount":"7CAbMzgimfoHTQy32bJhB3wCx1j3XfZp5TARGMcgp4Fe", //Sender address (public key) "toAccount":"CZVkVSX7iQVdQpMwV7Pg3j7MmSdKeLEwWdFFjdA7nWc9", //Recipient address (public key) "time":"2020-06-05T09:40:13.433Z", //Time in UTC format "value":"0.05244140625", //Transaction amount "fee":"0.008740234375", //Fee paid for the transaction "currency":"CS", //Transferred currency "innerId":101, //Ordinal number of the transaction by sender’s wallet "index":0, //Ordinal number of the transaction in the block(count from 0) "status":"Success", //Transaction status, “Success” here means it was successful "blockNum":"7885122", //Block number, in which the transaction was written "found":true, //Service parameter indicating that the transaction was found in the blockchain "userData":null, // userData is missing in this transaction. For example, if this is a smart contract address, this field will contain source code of the smart contract (Try requesting transaction data in MainNet network for the transaction 26144194.1) "signature":"", //Transaction signature won’t be displayed "extraFee":null, //extraFee is missing in this case "bundle":null, "success":true, //Result of the request execution, “Success” here means it was successful "message":null //Message not displayed because the request was a "Succes"},In this example, we executed the retrieval of a transaction REST request to the Credits blockchain without any specialized development environment or additional tools.