Abstract: Techniques for a privacy-based user data sharing protocol disclose a system that receives a request to consent to share user data with a subscriber device. The system identifies, based on the request, a smart contract associated with the subscriber device. The smart contract comprises one or more conditions for collecting and managing the user data. The system generates a token based on the smart contract, in which the token indicates consent by a user to share the user data with the subscriber device according to the one or more conditions. The system records the generated token to a blockchain.

Abstract: A request processing system uses Iframes and in particular, nested Iframes to provide an isolated environment where various forms of user requests can be processed for different clients within one outer Iframe that can be re-instantiated across various client web applications. A user request can include a payment made using a cryptocurrency against the user's blockchain wallet. The request processing system can employ persistent authorization storage to allow users to authenticate themselves for future requests without further involving themselves (e.g., exposing their private key to authenticate themselves). The request processing system utilizes nested Iframes to promote security among simultaneously processed requests. Each nested Iframe can perform operations that are isolated from other nested Iframes.