Many people see a certain leading privacy protocol supporting threshold encryption and data privacy protection and naturally assume it is an absolute safe vault, eager to store all confidential information there. To be honest, this idea is very dangerous and somewhat lazy.

The key issue is this: although nodes indeed cannot see your sharded stored data, the entire access control system entirely depends on the smart contract rules you write on the Sui chain. In other words, the security ball is in your court.

Does your contract code have vulnerabilities? Was the private key managing permissions improperly leaked? Then the "lock" on the chain is basically useless. Programmable privacy sounds very advanced, but frankly, the security ceiling of the protocol is determined by your code quality, not by the protocol design itself.

Therefore, if you want to put key data on chain, you must go through a complete audit process and explicitly hardcode access rules. For those who lack the ability to write secure contracts, recklessly using programmable privacy systems can be even riskier than traditional centralized storage. This point must be carefully considered.