Abstract: Systems, methods, and computer media implementing blockchain-based identity and transaction platforms are described herein. Identity information, such as a photo, for a person can be encrypted and stored in a blockchain as part of enrolling the person as a user in a blockchain-based identity and transaction platform. Trust relationships can be formed between the user and other users, and records of the trust relationships can also be stored in the blockchain. Transactions between the user and other users with whom the user has formed a trust relationship can also be stored in the blockchain. The transactions can be authorized, for example, through a multi-stage verification process that accesses information stored on the blockchain. The transactions and identity information, along with other information, contribute to an economic identity of the person.