Bitcoin with C-Sharp

In this tutorial, we are going to introduce Bitcoin using C. We will be using C#’s bitcoin library, called NBitcoin.

Install Nbitcoin

dotnet add package NBitcoin

Generate a private key

A private key in the context of Bitcoin is a secret number that allows bitcoins to be spent. Every Bitcoin wallet contains one or more private keys.

This is how you generate a private key with NBitcoin:

var privateKey = new Key();

var bitcoinPrivateKey = privateKey.GetWif(Network.Main).ToString();

Console.WriteLine(bitcoinPrivateKey);

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Generate a public key

var privateKey = new Key();

var bitcoinPrivateKey = privateKey.GetWif(Network.Main);

var bitcoinPublicKey = bitcoinPrivateKey.PubKey.ToString();

Console.WriteLine(bitcoinPublicKey);

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Create a Bitcoin address

You know that your Bitcoin Address is what you share to the world to get paid.

var privateKey = new Key();

var bitcoinPrivateKey = privateKey.GetWif(Network.Main);

var bitcoinPublicKey = bitcoinPrivateKey.PubKey;

var address = bitcoinPublicKey.GetAddress(ScriptPubKeyType.Segwit, Network.Main);

Console.WriteLine(address);


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Generate Address from a known private key

var key = "L1TmYw2edTAyF9CtSF64k2Qc3AkKa8t9xn1vMa92xCe9VCzTbYzV";

var bitcoinSecret = new BitcoinSecret(key);

var address = bitcoinSecret.PubKey.GetAddress(ScriptPubKeyType.Segwit,Network.Main);

Console.WriteLine(address);

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Generate Mnemonic

A mnemonic recovery phrase or bitcoin seed is a list of words which store all the information needed to recover a bitcoin wallet

var mnemo = new Mnemonic(Wordlist.English, WordCount.Twelve);

//key victory fashion rough torch ice lesson main grape actual horn dinosaur

Generate Address from Mnemonic

var mnemo = new Mnemonic("dry brown drive parade drastic shine embrace hard report loan fold iron", Wordlist.English);

var hdroot = mnemo.DeriveExtKey();

var pKey = hdroot.Derive(new KeyPath("m/84'/0'/0'/0/0"));

var address = pKey.PrivateKey.PubKey.GetAddress(ScriptPubKeyType.Segwit, Network.Main));

Console.WriteLine(address);

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Generate Multiple Addresses from Mnemonic

Derivation path follows this convention:

m / purpose' / coin_type' / account' / change / address_index

So you can increase address_index from 0 to get new addresses from same mnemonic.

For more details: https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki

var mnemo = new Mnemonic("orange soup note oil token top slab elder mercy mad wool congress", Wordlist.English); 

var hdroot = mnemo.DeriveExtKey(); 

var pKey = hdroot.Derive(new KeyPath("m/84'/0'/0'/0/0")); 

var pKey2 = hdroot.Derive(new KeyPath("m/84'/0'/0'/0/1")); 

Console.WriteLine(pKey.PrivateKey.PubKey.GetAddress(ScriptPubKeyType.Segwit, Network.Main)); 

Console.WriteLine(pKey2.PrivateKey.PubKey.GetAddress(ScriptPubKeyType.Segwit, Network.Main));

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Conclusion

In this tutorial, we introduced bitcoin with c#. We saw how to generate a private key, public key, bitcoin address, mnemonic and also generate address from a mnemonic recovery phrase.

**Source : **https://programmingblockchain.gitbook.io/programmingblockchain/

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Comments

[MarkRLV]

Using VS2017. I did a PM> Install-Package NBitcoin -Version 6.0.18 and added using NBitcoin at the top of the program. Copied your first 4 lines:

var privateKey = new Key();
var bitcoinPrivateKey = privateKey.GetWif(Network.Main).ToString();
var bitcoinPublicKey = bitcoinPrivateKey.PubKey;
var address = bitcoinPublicKey.GetAddress(ScriptPubKeyType.Segwit, Network.Main);

VS2017 can't find ".PubKey"

Ideas?