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Ouyi OKX is the world's leading digital asset trading platform. 1) Its development history includes: it will be launched in 2017, the Chinese name "Ouyi" will be launched in 2021, and it will be renamed Ouyi OKX in 2022. 2) Core services include: trading services (coin, leverage, contracts, DEX, fiat currency trading) and financial services (Yubibao, DeFi mining, lending). 3) The platform's special functions include: market data services and risk control system. 4) Core advantages include: technical strength, security system, service support and market coverage.

APP software that can purchase mainstream coins includes: 1. Binance, the world's leading, large transaction volume and fast speed; 2. OKX, innovative products, low fees, high security; 3. Gate.io, a variety of assets and trading options, focusing on security; 4. Huobi (HTX), low fees, good user experience; 5. Coinbase, suitable for novices, high security; 6. Kraken, safe and compliant, providing a variety of services; 7. KuCoin, low fees, suitable for professional traders; 8. Gemini, emphasizes compliance, and provides custodial services; 9. Crypto.com, providing a variety of offers and services; 10. Bitstamp, an old exchange, strong liquidity,

Quantum Chain (Qtum) is an open source decentralized smart contract platform and value transmission protocol. 1. Technical features: BIP-compatible POS smart contract platform, combining the advantages of Bitcoin and Ethereum, introduces off-chain factors and enhances the flexibility of consensus mechanisms. 2. Design principle: realize on-chain and off-chain data interaction through main control contracts, be compatible with different blockchain technologies, flexible consensus mechanisms, and consider industry compliance. 3. Team and Development: An international team led by Shuai Chu, 80% of the quantum coins are used in the community, and 20% rewards the team and investors. Quantum chains are traded on Binance, Gate.io, OKX, Bithumb and Matcha exchanges.

Quantum chains can be traded on the following exchanges: 1. Binance: One of the world's largest exchanges, with large trading volume, rich currency and high security. 2. Sesame Open Door (Gate.io): a large exchange, providing a variety of digital currency transactions, with good trading depth. 3. Ouyi (OKX): operated by OK Group, with strong comprehensive strength, large transaction volume, and complete safety measures. 4. Bitget: Fast development, provides quantum chain transactions, and improves security. 5. Bithumb: operated in Japan, supports transactions of multiple mainstream virtual currencies, and is safe and reliable. 6. Matcha Exchange: a well-known exchange with a friendly interface and supports quantum chain trading. 7. Huobi: a large exchange that provides quantum chain trading,

Platforms that support Qtum trading are: 1. Binance, 2. OKX Ouyi, 3. Huobi, 4. Gate.io Sesame Open Door, 5. Siren, 6. Coinku, 7. Bit stamp, 8. Coinku, 9. Bybit, 10. Gemini, these platforms have their own characteristics and advantages.

The quantum chain (Qtum) transaction process includes three stages: preliminary preparation, purchase and sale. 1. Preparation: Select a compliant exchange, register an account, perform identity verification, and set up a wallet. 2. Purchase quantum chains: recharge funds, find trading pairs, place orders (market orders or limit orders), and confirm transactions. 3. Sell quantum chains: Enter the trading page, select the trading pair and order type (market order or limit order), confirm the transaction and withdraw cash.

Exchanges that support cross-chain transactions: 1. Binance, 2. Uniswap, 3. SushiSwap, 4. Curve Finance, 5. Thorchain, 6. 1inch Exchange, 7. DLN Trade, these platforms support multi-chain asset transactions through various technologies.

Suggestions for choosing a cryptocurrency exchange: 1. For liquidity requirements, priority is Binance, Gate.io or OKX, because of its order depth and strong volatility resistance. 2. Compliance and security, Coinbase, Kraken and Gemini have strict regulatory endorsement. 3. Innovative functions, KuCoin's soft staking and Bybit's derivative design are suitable for advanced users.