This electronic money transfer system provides an electronic money transfer method and a system for the same which allow handling electronic money in a sense that is very similar to cash, and which allow avoidance of loss of the electronic money even at a time of loss or theft of a terminal for operating the electronic money. To this end, first, information of an electronic certificate for a terminal (A) of a user A is sent from a terminal (B) of a user B to an electronic money management server (300), and information of the electronic certificate for the terminal (B) is sent from the terminal (A) to the electronic money management server (300). Thus, the terminals to perform the transaction are authenticated. Then, requests for a payment/receipt of electronic money is sent from the terminal (A) and the terminal (B) to the electronic money management server (300), based on which requests, the electronic money is transferred from the account of the user (A) to the account of the user (B) within the electronic money management server (300).

A computer-implemented method for improving security of smart contract comprises: obtaining a first and a second transactions both invoking a smart contract, wherein the first transaction is associated with a protection condition; executing the second transaction and updating a current state of the smart contract; determining whether the updated current state of the smart contract satisfies the protection condition; in response to determining that the updated current state satisfies the protection condition, executing the first transaction, and recording the second and the first transactions into a data block for adding to a blockchain; and in response to determining that the updated current state does not satisfy the protection condition, recording the second transaction into another data block for adding to the blockchain, without executing the first transaction.

Apparatus and methods for aggregating Mortgage Loans based upon servicing records verified via a blockchain distributed ledger. The Blockchain is distributed to Participants in the Loan, such as the Borrowers, Regulators, Servicers, and Vendors. Participants may submit an aggregation criteria, such as for example a criteria used for selecting loans to be included in a securitization pool. The present disclosure further provides a method for homogenizing a variety of loan criteria and memorializing execution of a smart contract on the Blockchain.

The present invention provides a system as a computer server platform and application programming software installed in primary devices of users for exchanging and trading digital asset securely and anonymously between two users of the system where said digital asset is registered under a device account of a primary device of a user with the system using a unique device account name. The present invention respects “privacy by design” in GDPR by using device account based-on anonymized data instead of personal account based-on personal data of prior art to ensure the system does not collect, store and process users' personal data in the course of device accounts' set-up and transactions of digital assets.

The techniques herein are directed generally to a “zero-knowledge” data management network. Users are able to share verifiable proof of data and/or identity information, and businesses are able to request, consume, and act on the data—all without a data storage server or those businesses ever seeing or having access to the raw sensitive information (where server-stored data is viewable only by the intended recipients, which may even be selected after storage). In one embodiment, source data is encrypted with a source encryption key (e.g., source public key), with a rekeying key being an encrypting combination of a source decryption key (e.g., source private key) and a recipient's public key. Without being able to decrypt the data, the storage server can use the rekeying key to re-encrypt the source data with the recipient's public key, to then be decrypted only by the corresponding recipient using its private key, accordingly.

Example embodiments of systems and methods for data transmission system between transmitting and receiving devices are provided. In an embodiment, each of the transmitting and receiving devices can contain a master key. The transmitting device can generate a diversified key using the master key, protect a counter value and encrypt data prior to transmitting to the receiving device, which can generate the diversified key based on the master key and can decrypt the data and validate the protected counter value using the diversified key.

Example embodiments of systems and methods for data transmission system between transmitting and receiving devices are provided. In an embodiment, each of the transmitting and receiving devices can contain a master key. The transmitting device can generate a diversified key using the master key, protect a counter value and encrypt data prior to transmitting to the receiving device, which can generate the diversified key based on the master key and can decrypt the data and validate the protected counter value using the diversified key.

Disclosed herein are methods, systems, and apparatus, including computer programs encoded on computer storage media, for processing blockchain-based guarantee information. One of the methods includes receiving a cyphertext of a digital document specifying a guarantee from a first computing device associated with a first guarantor and one or more zero-knowledge proofs (ZKPs) related to one or more values associated with the guarantee; verifying that the one or more ZKPs are correct; upon verifying that the one or more ZKPs are correct, storing the cyphertext to a blockchain based on performing a consensus algorithm; receiving a first message from a second computing device associated with a beneficiary or a representative of the beneficiary, the first message including an acceptance of the guarantee by the beneficiary; and updating a status of the guarantee to indicate that the guarantee has been accepted by the beneficiary.

Systems and methods are disclosed for executing an electronic transaction using a digital wallet. One method includes receiving electronic transaction information from an electronic transaction browser. An account enrollment status may be determined based on the electronic transaction information by a digital wallet system. The digital wallet system may generate a verification request based on the account enrollment status. The digital wallet system may receive user verification information via the graphical interface. The digital wallet system may also generate or verify a user account in the digital wallet system based on the account enrollment status and the user verification information. In one aspect, the digital wallet system may receive a request to complete an electronic transaction based on the electronic transaction information received from the electronic transaction browser. In another aspect, the digital wallet system may generate a token based on the request to complete the electronic transaction.

Systems and methods are disclosed for executing an electronic transaction using a digital wallet. One method includes receiving a guest checkout request and electronic transaction data from an electronic transaction browser. Whether a user is enrolled in the digital wallet system may be determined by the digital wallet system. The digital wallet system may authorize an electronic transaction based on the electronic transaction data upon determining the user is not enrolled in the digital wallet system. The digital wallet system may initiate a digital wallet enrollment upon authorizing the electronic transaction. The digital wallet system may store the user data in the digital wallet system and transmit a verification request to the electronic transaction browser. The digital wallet system may receive a verification response from the electronic transaction browser and may generate a digital wallet enrollment status message based on the verification response.