Private Key

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Before we get deeper into the concept of Ethereum Blockchainit is important to understand how Public Key, Private Key and Address are generated. To make this easier for beginners, I am trying to explain the technical concept with an example. Ethereum key generation is based on elliptical curve ecpk1. Eliptical curve EC is intense mathematics, and there are a lot of great articles on internet covering deep details of elliptical curve.

There are standard libraries to generate Ethereum key pair in much safer bitcoin private key and public key tokens. In this article, just for demonstration, I will use elliptical curve Javascript libaray to perform elliptical curve operations. A good library generate a private key with taking sufficient randomness into account.

For this exercise we will take "1" bitcoin private key and public key tokens private key which is an acceptable private key because it lies in specified range mentioned above. Ethereum requires private key to be bit long. Here is the sample code for nodejs.

This is done using group operation of EC cryptography. To derive public key, private key is multiplied by G. Multiplication used to derive public is EC multiplication which is entirely different from normal multiplication for which I am going to use JS library. G is called generator point which is one of the domain parameters of EC cryptography. G has fixed value for ecpk1, which is recommended by experts. For a given private key, pr, the Ethereum address A pr a bit value to which it corresponds is defined as the right most bits of the Keccak hash of the corresponding ECDSA public key.

To generate Ethereum address, take Keccak hash of public key. Right most 20 bytes is your Ethereum address. This is just an example to understand the concept. Please do not use it to generate real wallet to hold ETH.

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A Bitcoin SIN is comparable to a Bitcoin address, as they are both able to be derived from the same type of public and private keys.

To generate a pem file by running the following:. To create your webclient:. A URI can be added to pair with the test server. The BitPay server requires a public and private key which are used for all client interaction with the server. The public key is used to derive the client identity and to securely sign all API requests from the client.

Storing your private key is necessary. Depending on your circumstances, there are two methods to create a private key, internally or externally and inject the key into the SDK. Create a private key using the SDK:. Store the private key, as it is necessary, and inject it into the SDK:. Inject the private key into the SDK:. You will then use your keypair to derive your SIN. When creating your keypair and SIN, you must be sure to save your private key.

First, create your keys. Which will return something like:. Packages are available for Python 2. With the package installed, import the BitPay Key Utilities:. Save the pem file:. Running the above code will return a response similar to the following response:.

Generate a pem file by running the following:. Run the following to get the SIN from the pem file:. Note that for this example, we are pairing to BitPay's Test server. Request pairing using the client:. To generate a pem file by running the following: Internal Create a private key using the SDK: With the package installed, import the BitPay Key Utilities: Article is closed for comments.