A cryptocurrency protocol and system and method for use of the same are disclosed. In one embodiment of the cryptocurrency protocol, a contingent financial transaction request is received. A blockchain addition mapping to a distributed accounting subledger of interest is performed to create contingent stored value. This blockchain addition mapping includes the contingent financial transaction request entered as an appended pair of contingent accounting entries including a corresponding debit entry and credit entry with validation detail data. If the appended pair of contingent accounting entries are validated, a blockchain addition mapping to a distributed accounting ledger of interest is performed to enter the contingency financial transaction request as an appended pair of accounting entries including the corresponding debit entry and credit entry.

A system and method for providing an electronic wallet characterized by enhanced cryptocurrency handling and security for debit card transactions includes a control computer, a financial information exchange server, a transfer server, and a wallet banking platform in communication with the electronic wallet. The wallet includes a virtual debit card, and the system allows a user to instantly load funds on to the debit card using a hand-held computing device upon which the electronic wallet software application resides. The electronic wallet system provides a firewall between the debit card and the user's traditional bank account(s).

A system and method for providing reputational information on users involved in transactions is detailed. The method includes evaluating fulfilment of transactions, particularly in the context of contracts, and providing a record of that on a blockchain through reputational information, which can be retrieved later. Similar reputational information for other transactions can be retrieved and linked to the same user, based on a hash of a master public key for a user. Aggregate reputational information can be computed from pieces of reputational information retrieved. The evaluation and record provision can be implemented using a deterministic finite automaton (DFA). For each user involved in each contract, the DFA not only configures and allows for implementation of the contract, but also considers the extent of fulfilment of the contract's terms. The DFA generates reputational information in relation to each user in each contract, and this reputational information is published to and stored on the blockchain.

A payment network is operated with a blockchain-based ledger. In one embodiment, a request is prepared to complete a transaction from an account associated with a payer digital wallet for entry on a blockchain. The request includes an amount and a payee identifier associated with a payee digital wallet. The request is sent to the blockchain and approved. A balance of the payer digital wallet and a balance of the payee digital wallet are adjusted in response to approval of the request to complete the transaction by at least writing a portion of data associated with the transaction comprising the amount and the payee identifier to the blockchain. A reputation ledger associated with the account is recorded in the blockchain in association with the transaction. The reputation ledger includes at least one reputation score associated with at least one previous transaction conducted by the account.

Blockchain-based, smart contract platforms have great promise to remove trust and add transparency to distributed applications. However, this benefit often comes at the cost of greatly reduced privacy. Techniques for implementing a privacy-preserving smart contract is described. The system can keep accounts private while not losing functionality and with only a limited performance overhead. This is achieved by building a confidential and anonymous token on top of a cryptocurrency. Multiple complex applications can also be built using the smart contract system.

A method for facilitating the exchange of a stable cryptocurrency collateralized by government-issued debt. First granularity parameters are received through a first wallet interface of a first digital wallet. A first restricted use key is generated based upon the first granularity parameters and provided to an owner of a second digital wallet. A second restricted use key is generated based upon second granularity parameters received through a second wallet interface associated with the second digital wallet. Information from a blockchain wallet is accessed using the second restricted use key wherein the information relates to one or more of an ID classification and risk score of the second wallet owner at a level of detail determined by the second granularity parameters. An indication to proceed with a transaction between the first digital wallet and the second digital wallet may then be received through the first wallet interface.

Systems and methods for managing a set of electronic assets from a single location are disclosed. The method includes providing a portal with a network security access control. The method includes determining that login credentials input to the access control are associated with a set of electronic assets corresponding to a plurality of third-party computing systems with application programming interface (API) gateways configured to accept API calls directed to changes in functionality of the electronic assets. The method includes presenting, via the portal, a virtual icon to identify a coordinated action with respect to the set of electronic assets and, in response to a selection of the virtual icon, executing a set of API calls that include an asset-specific API call to each third-party computing system in the plurality of third-party computing systems to implement the coordinated action on all electronic assets in the set of electronic assets.

A computer-based system converts cryptocurrency into a virtual asset. The system includes a user account database server configured to store data of a plurality of user accounts. The stored data pertains to each user account and indicates an accounting of obligations of the system to the user. The system also includes a cryptocurrency account server configured to receive, from a networked device of a user, a transfer of crypto currency, from an external cryptocurrency account. In response to receipt of such a transfer, the cryptocurrency account server is configured to update the data pertaining to the obligations of the system to the user. The system also includes a user interface server configured to receive a request from the user for conversion of cryptocurrency to an asset. In response to receipt of the request, the system updates the data pertaining to the user account of the user.

A system and method of verifying a user for participation in a block chain of a distributed network. The method includes receiving, by one or more validation devices of the distributed network, a request for participation in adding transaction records to the block chain, the request being received from a mobile communication device of the user and including behavioral data collected by the mobile communication device. In response to determining that the behavioral data satisfies a human characteristic threshold, determining that the behavioral data is not associated with another device of the distributed network. In response to both those conditions above, verifying the user and enabling the user to participate in the block chain distributed network by adding a block including transaction records to the block chain via the mobile communication device.

The apparatus for managing cyptocurrency rewarded for a response selected via lottery comprises: memory for storing commands; and a processor for executing actions in accordance with the commands. The actions executed in accordance with the commands comprise: transmitting, to a server, responses to a questionnaire associated with an advertisement after same transmitted to a client device is viewed; selecting one or more responses from among the responses transmitted from users; informing the client device that transmitted the selected response of the selection which includes a reward; receiving, from the client device that received the selection notification, information concerning receiving cryptocurrency; and paying cryptocurrency, which is legal tender, corresponding to the reward.