# Problems Blockchain technology evolved first bit-coin generation which embodies the basic concept of Distributed Ledger to second-generation Ethereum adding smart contract features. Because of the structure of representative governance, Bitcoin called the typical first generation is hard to upgrade. And PoW patterns could be influenced by Miners’ interest in mining profit, it harmed the concept of decentralization. That comes from miners’ who provide computing power getting bigger. Ethereum rear up the problem of delaying speed from raise of dater process volume, and the problem of raising of the Gas fee the transfer commission. Following first and second-generation main-net create a block using PoW pattern have the fundamental problem of computing power and overspending of electric source. So in Ethereum 2.0 try to transfer to the PoS pattern. But in November 2020 the problem is still unsettled. ![PoS 3.0](/files/SdrHsu6qvMWd6WYjh8Nc) --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://aok.gitbook.io/aok-en/background/problems.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.