I didn't find a data collection tool which is secure and safe that led me to create Blocksurvey. It uses Blockstack blockchain for Decentralized Identity and data storage. All your data collection is encrypted using your own keys.<p>Tech Stack:
Account / Identity : Blockstack's Decentralized Identity
Auth: Blockstack Connect
Storage: Gaia Decentralized Storage
Encryption: PGP & Blockstack Encryption