SolidStamp
SolidStamp (2017-2018) was my attempt to enter the blockchain startup world. The service was supposed to connect smart contract users and security auditors to ensure the safety of their ethers and tokens. It maintained an on-chain database of smart contract audits so you could be sure you were investing your funds securely. SolidStamp allowed to hire top-notch security specialists to audit the contract you plan to use to validate their authenticity and security.
I discontinued it because of lack of the product-market fit.
You can read more at the SolidStamp Medium profile.