2025-08-30
Today, with the rapid development of blockchain technology, public chains such as Ethereum are difficult to support large-scale applications due to slow transaction processing speed and other issues. The emergence of Rollup technology brings hope to solve these problems. It is like an efficient "Data Compressed Packet", which greatly improves network throughput without sacrificing the security and decentralization characteristics of blockchain. So, what is Rollup? How does it work? And in which scenarios does it play a role?
Rollup is a Layer 2 scaling solution designed to enhance the transaction processing capabilities of blockchain. Its core principle is to calculate and package a large number of transactions off-chain, generate a "Compressed Packet" containing numerous transaction information, and then submit the key data of this "Compressed Packet" (such as transaction hash value, state root, etc.) to the main chain for verification, thereby reducing the number of transactions directly processed by the main chain. Unlike other scaling solutions, Rollup inherits the security of the main chain, and all transactions are ultimately protected by the consensus mechanism of the main chain, ensuring the immutability and reliability of data. This design not only improves transaction processing efficiency, but also guarantees the core characteristics of blockchain.
Rollup is mainly divided into two types: Optimistic Rollup and Zero - Knowledge Rollup (ZK - Rollup), each with its own characteristics in their working principles. Optimistic Rollup is based on the "optimistic assumption". By default, all transactions packaged into Rollup are legal. The transaction is quickly submitted to the main chain, and only when other nodes discover anomalies and raise questions will the relevant transactions be verified in detail. ZK - Rollup uses zero-knowledge proof technology to verify transactions off-chain and generate zero-knowledge proofs. The proof is submitted to the main chain together with the transaction data. The main chain does not need to recalculate the transaction, but only needs to verify the validity of the proof to confirm the legitimacy of the transaction. Both types have their own advantages and disadvantages. The former has strong compatibility but takes longer to confirm, while the latter is efficient but difficult to implement. When HashKey Exchange explores blockchain application innovation, it also pays attention to the development of Rollup technology to provide users with more efficient digital asset trading services.
The application scenarios of Rollup technology are very extensive. In the field of decentralized finance (DeFi), it can greatly improve transaction speed, reduce gas fees, and make borrowing, trading and other operations more convenient and efficient. HashKey Exchange If Rollup technology is adopted, it can optimize the DeFi business on the platform and provide users with a smoother trading experience; in the gaming industry, Rollup can support large-scale player online interaction, carrying complex game logic and asset transactions; in the NFT market, Rollup can accelerate the casting and trading process of NFTs, reducing user waiting time and costs. With the continuous maturity of technology, Rollup will become an important force in promoting the large-scale landing of blockchain applications.
What is HashKey Exchange?
HashKey Exchange is one of the first regulated cryptocurrency exchanges in Hong Kong to obtain a license from the Securities and Futures Commission (SFC). It supports fiat currency deposits and trading in Hong Kong dollars (HKD) and US dollars (USD), offering users spot trading services for mainstream digital assets including Bitcoin (BTC), Ethereum (ETH), and Tether (USDT). The platform also provides OTC (over-the-counter) services to meet the needs of large-value asset transactions and fiat currency conversion, ensuring more flexible and private trading. To cater to the asset allocation needs of different investors, HashKey has launched the HashKey Earn channel, offering users fixed-term and demand financial products to achieve stable appreciation of crypto assets. The platform holds ISO 27001 and 27701 security certifications, employs a 98% cold wallet storage mechanism, and incorporates security measures such as two-factor authentication to provide users with a stable and reliable trading environment.
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