There&#x27;s this: <a href="https:&#x2F;&#x2F;blog.ethereum.org&#x2F;2015&#x2F;12&#x2F;03&#x2F;how-to-build-your-own-cryptocurrency&#x2F;" rel="nofollow">https:&#x2F;&#x2F;blog.ethereum.org&#x2F;2015&#x2F;12&#x2F;03&#x2F;how-to-build-your-own-c...</a>