Blockchain is a distributed and decentralized digital ledger technology. Its core principles include: 1. Distributed ledger ensures that data is stored simultaneously on all nodes; 2. Encryption technology, linking blocks through hash values to ensure that data is not tampered with; 3. Consensus mechanisms, such as PoW or PoS, ensure that transactions are agreed between nodes; 4. Decentralization, eliminating single point of control, enhancing censorship resistance; 5. Smart contracts, protocols for automated execution. Cryptocurrencies are digital assets issued based on blockchain. The operation process is: 1. The user initiates transactions and signs digitally; 2. The transactions are broadcast to the network; 3. The miner or verifier verifies the validity of the transaction; 4. Multiple transactions are packaged into new blocks; 5. Confirm the new zone through consensus mechanism

Get the Android version of APP download link through Binance official website or official social media, and give priority to the APK file provided by the official website; 2. Enable "Allow to install unknown sources" in the mobile phone settings, check the SHA256 hash value after downloading and complete the installation; 3. Grant necessary permissions such as storage and network when starting for the first time to ensure normal use of the functions; 4. The new version v6.135.0 enhances the risk control and anti-phishing protection of the device, optimizes transaction response speed and integrates the Web3 storage portal; 5. Beware of phishing software when downloading, and only obtains applications from official channels. Note that the package is called "com.binance.dev", and complies with the usage restrictions in your area. It is recommended to enable automatic updates to obtain the latest security patches. The above steps and attention are required.

Confirm that the official website address is www.okx.com, and manually enter it to prevent phishing; 2. Make sure that the Android system is above 5.0, reserve 100MB of space and enable the "Allow unknown sources" permission; 3. Download the APK file for Android v6.135.0 through the official website, and it is recommended to verify the SHA256 hash value; 4. Click the APK file to install, and manually allow "Continue to install" or "Trust this source"; 5. Grant necessary permissions such as storage, network, etc.; 6. Open the Ouyi OKX icon on the desktop after the installation is completed.

Binance: is known for its high liquidity, multi-currency support, diversified trading modes and powerful security systems; 2. OKX: provides diversified trading products, layout DeFi and NFT, and has a high-performance matching engine; 3. Huobi: deeply engaged in the Asian market, pays attention to compliance operations, and provides professional services; 4. Coinbase: strong compliance, friendly interface, suitable for novices and is a listed company; 5. Kraken: strict security measures, supports multiple fiat currencies, and has high transparency; 6. Bybit: focuses on derivative trading, low latency, and complete risk control; 7. KuCoin: rich currency, supports emerging projects, and can enjoy dividends with KCS; 8. Gate.io: frequent new coins, with Copy Tr

Smart contracts are automatic execution programs stored on blockchains. The core is to implement the "if... then..." logic through code to execute protocols in a decentralized and tamper-free way. 1. Write code: define contract logic using languages such as Solidity; 2. Compile: convert the code into machine-readable bytecode; 3. Deploy: publish the bytecode to the blockchain through transactions and generate a unique address; 4. Trigger execution: When the preset conditions are met, the contract will run automatically; 5. Record the result: All operations are permanently recorded on the chain to ensure transparency and verifiability. It solves the trust, efficiency, cost, transparency and execution risks in traditional protocols, and is widely used in DeFi, supply chain, copyright management, voting, insurance and gaming fields.

Through its Turing-complete smart contracts, EVM virtual machines and Gas mechanisms, Ethereum has built a programmable blockchain platform beyond Bitcoin, supporting diversified application ecosystems such as DeFi and NFT; its core advantages include a rich DApp ecosystem, strong programmability, active developer community and cross-chain interoperability; it is currently implementing consensus transformation from PoW to PoS through the upgrade of Ethereum 2.0, introducing beacon chains, verifier mechanisms and punishment systems to improve energy efficiency, security and decentralization; in the future, it will rely on sharding technology to realize data sharding and parallel processing, greatly improving throughput; at the same time, Rollup technology has been widely used as a Layer 2 solution, Optimistic Rollup and ZK-Rollu

Selecting a suitable exchange can reduce transaction costs. Mainstream platforms such as Binance, OKX and Huobi provide different rate structures and platform currency discounts; 2. Priority is given to using limit orders as pending orders to enjoy lower rates, avoid frequent use of market orders, resulting in high order eating fees; 3. Concentrate transactions to increase transaction volume, reach VIP level and enjoy ladder discounts, and enable fee deduction function by holding platform coins (such as BNB, OKB, HT); 4. Pay attention to the official exchange activities, participate in trading competitions, rebate plans or limited-time zero-fee activities to further save costs; 5. Optimize withdrawal strategies, choose low-cost currencies and network non-congestion periods to withdraw cash, and reduce the number of small-scale frequent withdrawals, thereby reducing overall expenditure.

Blockchain is a decentralized distributed ledger technology that ensures data is tamper-proof and secure and trustworthy through encryption algorithms and consensus mechanisms, and has higher transparency and risk resistance than traditional centralized databases; 1. Blockchain is linked to blocks, and each block contains transaction data and is connected through cryptographic methods; 2. Its core features include decentralization, distributed ledger, tamper-proof, transparency, encryption security and consensus mechanism; 3. Digital currencies such as Bitcoin operate based on blockchain, and transactions are verified by the entire network nodes and packaged into the block, ensuring openness and transparency and unchangeable; 4. Public keys are used to receive digital currency, and private keys are the only vouchers to control assets and must be strictly confidential; 5. The method of safely custody of private keys includes using hardware storage and paper