Methods, systems, and computer program products for building an encrypted document store are provided herein. A computer-implemented method includes building an encrypted ordered key-value store; encrypting one or more sensitive keys to be stored in the ordered key-value store using an order preserving encryption scheme; storing a state of the order preserving encryption scheme in the ordered key-value store; and encrypting one or more values corresponding to the one or more sensitive keys using a semantically secure encryption scheme.

Embodiments of the present specification provide a method, an apparatus, a client terminal, and a server for data processing. The method includes: selecting, based on a data attribute of to-be-processed data, a target coordinating server from a plurality of coordinating servers, the plurality of coordinating servers belonging to a plurality of server clusters respectively; and sending a data processing request to the target coordinating server, such that a server cluster to which the target coordinating server belongs processes the data processing request preferentially, the data processing request directing to the to-be-processed data.

A method for on-behalf ATM processing via blockchain includes: receiving, by a receiver of an automated teller machine (ATM), a transaction identifier; receiving, by an input device interfaced with the ATM, a withdrawal amount; identifying, by the ATM, a blockchain transaction in one of a plurality of blocks comprising a blockchain, wherein the blockchain transaction includes at least the transaction identifier and a current balance; and processing, by the ATM, withdrawal of the withdrawal amount based on the current balance, where processing includes dispensing, by a dispenser interfaced with the ATM, currency equivalent to the withdrawal amount if the withdrawal amount is less than or equal to the current balance or displaying, by a display device interfaced with the ATM, a message indicating an insufficient balance if the withdrawal amount is greater than the current balance.

An example operation may include one or more of configuring a blockchain network comprising first and second blockchain nodes, providing, by the first blockchain node, a data reference to the second blockchain node, accessing a document, by the second blockchain node, from the first blockchain node, and providing by the second blockchain node, a proof of receipt for the document to a shared blockchain ledger.

This invention relates generally to distributed ledger technology (including blockchain related technologies), particularly a method and corresponding system for providing a blockchain transaction comprising a redeem script for an output that comprises: i) a plurality of public keys, each associated with a corresponding private key, wherein each public key is uniquely associated with a potential state of at least one data source; and ii) logic arranged to provide a result based on: A) a determination of which of the plurality of associated private key(s) is/are used to sign the unlocking script, so as to provide an interim result: and B) a comparison of a parameter supplied via the unlocking script against the interim result, and further attempting to spend the transaction output more than once, each attempt supplying a different parameter.

The disclosure relates to, among other things, systems and methods for facilitating the verification of the integrity of digital content. Embodiments of the disclosed systems and methods may provide mechanisms for generating a secure and unambiguous record of the creation and/or modification of digital content and/or other media associated with events. Further embodiments may provide for a ledger configured to capture a record of creation and/or modification actions performed in connection with digital content.

Embodiments of the present application provide a blockchain-based data evidence storage method, a blockchain-based data check method, and relevant apparatuses. The data evidence storage method comprises: performing irreversible encryption on data content of a target file to obtain irreversibly encrypted data of the target file; storing the irreversibly encrypted data in a blockchain and obtaining on-chain evidence storage information of the irreversibly encrypted data; generating a digital watermark of the on-chain evidence storage information; embedding the digital watermark into the target file; and storing the target file embedded with the digital watermark of the on-chain evidence storage information.

Methods, systems, and apparatus for risk mitigation for a cryptoasset custodial system include transmitting an endorsement request for a cryptoasset transaction to a user device configured to cause the user device to prompt a user to endorse the cryptoasset transaction. Multiple data points are collected from mobile devices associated with the user. The data points indicate an identity of the user. A cryptographic endorsement of the cryptoasset transaction is received from the user device. A graphical visualization including a risk metric is generated based on the data points. The risk metric indicates a risk of accepting the cryptographic endorsement from the user device. Generating the graphical visualization includes determining whether the plurality of data points matches expected values.

An asset trading system utilizing a distributed ledger and configured to: when a creation request to create a digital fund token representing at least one share of a fund having a plurality of different assets (i) is received, (ii) is electronically signed with a private key associated with a first addressed account, and (iii) indicates a composition of the at least one share of the fund: place the plurality of different assets represented by the at least one share of the fund into an escrow account; create the digital fund token, wherein the digital fund token indicates the composition of the share of the fund; and record the creation of the digital fund token on a distributed ledger.

An example operation may include one or more of acquiring, by an organization node, a user profile from a blockchain, determining, by the organization node, a role of the user based on the user profile, detecting, by the organization node, user actions directed to graph expansions, and executing, by the organization node, a smart contract to analyze user behavior based on the detected user actions and the role to produce role-based user behavior parameters.