### 1. **The United States and Blockchain Technology**

- **Bitcoin (Bitcoin) and Solana (Sol Chain)**: Bitcoin, as the earliest blockchain technology, is mainly used as a store of value and a decentralized payment tool. Solana, on the other hand, is a high-performance blockchain platform that focuses on fast transactions and low fees, making it suitable for the development of decentralized applications (DApps).
- **Wealth for the People**: The United States has extensive innovation and application in the field of blockchain, and many enterprises and individuals have achieved wealth growth and transfer through cryptocurrency and blockchain technology. The US government is also gradually formulating relevant regulations, trying to find a balance between innovation and supervision.

### 2. **Russia and Ethereum (ETH chain)**
- **Ethereum**: Ethereum is a smart contract platform that supports decentralized applications and financial tools (such as DeFi). When facing Western financial sanctions, Russia may use blockchain technologies like Ethereum to bypass traditional financial systems for cross-border payments and fund flows.
- **Blockchain Applications Under Financial Sanctions**: Despite the severe financial sanctions imposed by Western countries, the decentralized nature of blockchain technology enables Russia to conduct international trade and fund transfers through cryptocurrencies, thus mitigating the economic pressure to a certain extent.

### 3. The Role of Blockchain in War and Sanctions
- **Advantages of Decentralization**: The decentralized nature of blockchain technology means that it is not controlled by a single country or institution, so in extreme situations such as war and sanctions, blockchain can provide an alternative financial channel for sanctioned countries.
- **Cross-border payments**: Through blockchain, sanctioned countries like Russia can bypass the traditional SWIFT system and directly transact with other countries or companies, reducing reliance on the US dollar and Euro.

### 4. **Challenges and Risks**
- **Regulatory Pressure**: Although blockchain technology offers the possibility of bypassing traditional financial systems, governments around the world (especially in Western countries) are stepping up regulation of cryptocurrencies, attempting to restrict their use in illegal activities.
- **Technical Limitations**: The blockchain technology is currently facing issues such as scalability, transaction speed, and energy consumption. Especially when applied on a large scale, these limitations may affect its effectiveness.

### Summary
Blockchain technology, especially platforms such as Bitcoin, Ethereum, and Solana, is being widely used globally. For countries like the United States, blockchain is more of a tool for innovation and wealth management; while for sanctioned countries like Russia, blockchain has become an important means to bypass traditional financial systems and maintain economic operations. However, the application of blockchain technology also faces regulatory and technological challenges, and its future development will depend on adjustments in national policies and technological advancements.