Ethereum: How to check confirmations number programmatically

Ethereum and Bitcoin Address Verification

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In this article, we will explore how to check the confirmation number of a specific Bitcoin address programmatically using the Blockchain.info API. We will also cover some best practices for validating addresses and executing transactions on Ethereum.

Address Verification

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Before we dive into the code, let’s check the input addresses to make sure they are valid:

function isValidAddress(address) {
const regex = /^[0-9a-fA-F]{40}$/;
return regex(address);
} }
const address1 = "1A1B2C3D4E5F6G7H8I9J0K";
const address2 = "abc123def456";
if (! isValidAddress(address1)) {
console.error("Invalid address:", address1);
} else {
console.log(Valid address: ${address1});
} }
if (! isValidAddress(address2)) {
console.error("Invalid address:", address2);
} else {
console.log(Valid address: ${address2});
} }

This code defines the isValidAddress function, which uses a regular expression to match the length and format of Bitcoin addresses. If the input address is valid, it returns true; otherwise, it returns false.

API Request

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To get the confirmation number for an Ethereum address using the Blockchain.info API, we need to make an HTTP request to their API endpoint. Here is a step-by-step guide:

• Get your Blockchain.info API Key: Go to [Blockchain.info]( and register an account.

• Create a new API Key: After logging in, go to the “API” tab, then click on “Keys”. Create a new API key by clicking on “New API Key”.

• Get the API URL

  : After creating the API key, copy the “key” and “secret” values.

• Make an HTTP request to the Ethereum blockchain API endpoint: Use a library like Axios or the browser console API to make a GET request to the Ethereum blockchain API endpoint.

Here is an example of using Axios:

import axios from 'axis';
const apiEndpoint = '
const apiKey = 'YOUR_API_KEY_HERE'; // Replace with key
async function getConfirmationNumber(address) {.
const headers = { "X-API-KEY": apiKey };
const params = {"to": address, "from": "0xYourAccountAddress", "block_number": "last_block", "confirmations": "1"};
try {
const response = wait axis.get(apiEndpoint, { params });
return response ;
} catch (error) {
console.error(error);
} }
} }
const addressToGetConfirmationNumber = '0xYourAccountAddress';
getConfirmationNumber(addressToGetConfirmationNumber).then((confirmationNumberResponse) => {
if (!confirmationNumberResponse || confirmationNumberResponse.length === 0) {
console.log("No data returned.");
} else {
const confirmationNumbers = confirmationNumberResponse.map((item, index) => item.confirmations);
console.log(Confirmed transactions ${confirmationNumbers[index]}.);
} }
});

best practices

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• Check for errors and exceptions: Always check the response from the API to make sure it is valid and does not throw any errors.

• Verify your input: Make sure you have verified your Ethereum address and key before sending a request to the blockchain API.

• Deal with Paging: If you need to get multiple confirmations, be aware of the paging limits imposed by the blockchain API.

• Keep your API keys safe: Never hardcode API keys; consider using environment variables or secret management solutions.

Usage Examples

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• Order Tracking

  : You can use this feature to track orders on your e-commerce platform by sending a request with an Ethereum address and a paging limit to get confirmation numbers.

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