Recently, Ethereum founder Vitalik Buterin (V God) published his insights on Bitcoin and Ethereum expansion solutions. He believes that if we want Bitcoin to exist as more than just a payment method, we need to adopt expansion solutions similar to Plasma or ZK Rollup. Fortunately, these two solutions have been tested on Ethereum and have achieved certain results. In addition, he also mentioned Optimism and Arbitrum as successful cases of Rollup, which can be used as case studies for Bitcoin.

Vitalik further tried to find out the commonalities between the two ecosystems of Ethereum and Bitcoin. He pointed out that both blockchain systems, whether Bitcoin or Ethereum, have the characteristic of immutability. This means that once a transaction is confirmed and written into the blockchain, it cannot be changed or deleted. This characteristic ensures the security and reliability of transactions, making Bitcoin and Ethereum widely accepted digital assets around the world.

However, Vitalik also recognizes that Bitcoin and Ethereum have some challenges with L1 privacy. L1 refers to the first layer of the blockchain, the underlying protocol layer. At this layer, transaction and account information is public, and anyone can view and track the flow of funds. This may raise privacy and security concerns in some cases.

To solve this problem, the Ethereum team has been trying various expansion solutions for many years. The latest proposal is EIP-4844, which introduces a new technology called "blob". This technology can process up to 100,000 transactions per second, greatly improving the scalability and throughput of Ethereum.

In Vitalik's opinion, both Bitcoin and Ethereum need to find expansion solutions to meet the growing demand and application scenarios. Technologies such as Plasma and ZK Rollup have been tested on Ethereum and have proven their feasibility. Optimism and Arbitrum, as successful cases of Rollup, can provide useful reference for Bitcoin.

Vitalik's insights provide us with a direction for thinking about scaling solutions for Bitcoin and Ethereum. By adopting technologies similar to Plasma or ZK Rollup, we can further improve the performance and privacy protection capabilities of these two ecosystems. At the same time, for Ethereum, the introduction of EIP-4844 has brought new hope for solving the scalability problem. As technology continues to develop, Bitcoin and Ethereum are expected to usher in wider applications and development.