2025-08-30
By 2025, the cross-border transfer system of HashKey Exchange in Hong Kong achieves anonymization processing for transactions below 5 million Hong Kong dollars through zero-knowledge proof technology. The verification time is compressed to within 2 seconds, and the risk of transaction data leakage is reduced by 99%. As the core infrastructure of the Web3 ecosystem, privacy technology achieves data "available but invisible" in a decentralized environment through cryptographic algorithms and distributed system design, promoting the transition of the Internet from "transparent interaction" to "privacy-first" paradigm.
Zero-Knowledge Proof (ZKP) allows the prover to verify the authenticity of the claim without revealing specific data. Zcash's zk-SNARKs protocol generates transaction proofs through elliptic curve encryption, allowing the sender to prove that they have sufficient balance without exposing the address and amount, reducing Gas fees by 30%. HashKey Exchange's compliance framework integrates a similar mechanism. When users transfer money across borders, the system automatically generates transaction validity proofs. By 2025, it has processed over 1.20 million anonymous transactions with a verification accuracy rate of 99.98%.
The Bulletproofs algorithm further optimizes the proof efficiency, and its linear verification complexity makes the proof size of range proofs (such as "account balance between 100-1000 ETH") only 1/10 of the traditional scheme. After a certain DeFi protocol adopted Bulletproofs, when users pledged LP tokens to participate in liquidity mining, the privacy protection of the pledged amount reduced MEV (miner extractable value) attacks by 65%.
Full homomorphic encryption (FHE) allows direct computation of encrypted data. The Fhenix protocol implements EVM-compatible privacy smart contracts. Users can encrypt ETH and deposit it into the contract, which automatically performs operations such as borrowing and trading, and the decrypted results are consistent with plaintext. The cross-chain gateway of HashKey Exchange uses partial homomorphic encryption technology. When users lock assets on the source chain, the gateway generates encrypted credentials, and the target chain releases equivalent tokens after verification. By 2025, cross-border asset mapping will exceed 80 million Hong Kong dollars, and the transaction fee will be reduced by 40%.
MPC (Multi-Party Secure Computing) supports multi-party joint computing without sharing the original data source. A medical alliance analyzes patient genetic data through MPC. Hospital A provides lung cancer patient data, Hospital B provides health control data. After Model Training is completed, only the cancer risk prediction results are output, and the original data source is always kept locally. The compliance audit system of HashKey Exchange adopts MPC sharding key management. The user's private key is divided into 5 parts, and at least 3 fragments need to be verified simultaneously to unlock the assets. By 2025, the asset custody of processing institution customers will exceed $2 billion with zero security incidents.
Secret Network is built on Cosmos SDK and implements default privacy of smart contracts through Intel SGX trusted execution environment. Developers can write Secret Contracts in Rust language. When users call the contract, the input and output data is automatically encrypted and only the authorized party can see it. For example, a certain Supply Chain Finance platform uses Secret Contracts to manage accounts receivable. Suppliers, banks, and Logistics Companies share encrypted data through the contract, and financing approval is automatically executed. The financing cycle is shortened from 7 days to 24 hours.
Zk-Rollups compresses multiple transactions into one proof and submits it to L1 through zero-knowledge proof. Aztec Protocol's zk-Rollups supports private transactions and anonymous NFTs. Users can combine ETH and ERC-20 tokens for payment, and the transaction details are hidden in the proof. Gas costs are reduced by 50% compared to Optimism. After the compliance framework of HashKey Exchange is integrated with zk-Rollups, the throughput of processing compliance transactions will increase threefold by 2025, and the confirmation time of a single transaction will be shortened to 1.5 seconds.
DeFi protocol circumvents on-chain Data Analysis through privacy technology. Aave Arc institutional lending pool uses MPC to verify borrower qualifications, banks submit encrypted financial data, contracts automatically evaluate credit ratings, and loan interest rates dynamically adjust, protecting corporate secrets and improving fund efficiency. HashKey Exchange's DeFi aggregator integrates privacy routing, dispersing user transaction paths to multiple DEXs. By 2025, it will resist MEV robot attacks more than 500,000 times and reduce transaction slippage by 25%.
Medical data achieves cross-institutional collaboration through privacy computing. A multinational hospital alliance uses FL to train a diabetes prediction model. After encrypting local data, each hospital participates in the training, and the model parameters are updated synchronously. The final output prediction accuracy reaches 92%, and patient identity and medical records are always kept confidential. The medical data platform of HashKey Exchange is integrated with this mechanism. By 2025, it has processed more than 3 million cross-border data verifications, supporting collaborative research on rare diseases among 2,000 hospitals worldwide.
DID (Decentralized Identity) combined with zero-knowledge proof achieves "on-demand disclosure". After generating DID, users can optionally prove that they are "over 18 years old" or "have a master's degree" without revealing their ID number or graduation school. HashKey Exchange's KYC system adopts the DID + ZKP solution. Users upload encrypted identity files, and the system automatically verifies their authenticity. In 2025, more than 500,000 compliance user authentications were processed, and the average review time was reduced from 3 days to 2 hours.