Disclosed herein are methods and systems to facilitate a blockchain-backed peer-to-peer transaction without requiring the recipient's personally identifiable information and without updating the recipient's blockchain. A central server may receive a transaction request from a sender and may identify a system blockchain associated with the sender. When the server determines that the sender's accounts can satisfy the request, the server generates a unique transaction token. The server then transmits the unique transaction token to the sender, recipient (if indicated within the sender's request), and one or more electronic terminals. When the server receives an indication that the recipient has inputted the unique transaction token to the electronic terminal, the server appends a block instance corresponding to the transaction to the system blockchain.

An apparatus, system and method for buying, selling, and/or trading certain items in certain markets (such as, by way of non-limiting example, trading financial instruments) which offers a balance between complete multi-lateral anonymity amongst trading participants while retaining key information, and only making needed information involving historic and linked counter-party data available in a manner which discloses relevant information to the appropriate parties at the appropriate time is disclosed. The apparatus, system and method may comprise a electronic and/or computerized system for buying and selling of products, services, financial instruments including, but not limited to, securities, derivatives, commodities, liabilities, and/or other items which may be bought, sold and/or traded while maintaining the integrity of the markets in which such items are bought, sold and/or traded. The apparatus, system and method may allow for the progressive disclosure of information related the potential execution of product by establishing an anonymous alias and registering an interest in a proposed transaction based upon information that is both constructed by the alias and combined with information that is maintained and linked within a central facility wherein some or all such information within the central facility may be disclosed at an appropriate or desired time as the warranted by the situation related to a transaction.

A method for linking payment accounts includes: storing a plurality of account profiles, each profile including data related to a payment account including an account number and account data; encrypting the account number included in each account profile using a method of encryption to obtain an encrypted account number; receiving account linkage data, the data including a plurality of encrypted account identifiers, each identifier being indicated as being linked to another identifier, and each identifier being encrypted using the method of encryption; matching each of the encrypted account identifiers to an encrypted account number; and updating one or more account profiles to indicate a link to another account profile where the encrypted account number included in the profile being updated matches an encrypted account identifier that is indicated as being linked to an encrypted account identifier that matches the encrypted account number included in the other profile.

Various embodiments include a method of facilitating identity information exchange in a cryptocurrency transaction. An information compliance computer system can receive a pending cryptocurrency transaction from a transmitter wallet service system for managing one or more user wallet accounts, each associated with one or more cryptographically verifiable addresses in a cryptocurrency exchange network. The information compliance computer system can identify a recipient wallet service system associated with a destination address indicated by the pending cryptocurrency transaction. Information compliance computer system can exchange identity information between the transmitter wallet service system and the recipient wallet service system. The information compliance computer system can publish the pending cryptocurrency transaction to the cryptocurrency exchange network for inclusion into a block chain of the cryptocurrency network.

A system and method for in-game tokens or specialized virtual currency which may be used for a variety of transactions, including within a plurality of games, yet for which transactions may be sufficiently controlled to avoid adverse real world effects. The system and method provide blockchain tokens for gaming, in which transactions related to such blockchain transactions are both controlled and flexible.

A system for providing private, secure travel is provided. The system may include a transceiver. The transceiver may be operable to receive and transmit communication from and to a plurality of travelers and a plurality of service providers. The system may include an itinerary booking module. The itinerary booking module may process itinerary communications received from the plurality of travelers. The itinerary booking module may determine a plurality of legs included in each received itinerary. The itinerary booking module may book, via the transceiver, at least one service provider for each leg of each itinerary. The system may include a unique identifier generator. The unique identifier generator may generate a unique identifier for each of the plurality of travelers.

A method for remediating a midstream interrupt of an itinerary is provided. The method may include receiving an itinerary and identification documentation from a traveler at a pacted central processing system. The method may include committing the itinerary to a pacted central processing system. The method may include generating a unique identifier that identifies the itinerary and the traveler a the pacted central processing system. The method may include transmitting the unique identifier to the traveler. The method may include anonymously booking itinerary. The anonymous booking may include transmitting an encrypted version of the identification documentation and the unique identifier to one or more service providers. The method may include receiving data relating to an interrupt in the itinerary. The method may include remediating the interrupt to the itinerary.

A mechanism by which a secure, privacy preserving query system may be constructed from blockchain technology is disclosed. This system operates on the local differential privacy model through random responses using a private weighted coin protocol. The system specified allows for the ejection of malicious and/or non-interactive participants, minimizes blockchain storage size, and provides a mechanism for forward secrecy. The system specification uses a distributed random beacon to provide a public source of randomness. This randomness is utilized to perform random subset selection from a publicly known list of participating entities. The system uses a homomorphic self-tallying voting protocol under homomorphic encryption to further ensure participant privacy.

Some embodiments disclose the use of zero-knowledge proofs (ZKPs) to prevent or at least mitigate privacy compromises that can occur to transactions conducted on distributed ledger-based networks (DLNs). In particular, some embodiments disclose methods and systems where ZKPs can be used to keep confidential or at least mitigate public revelation of private transaction data due to the analyses of the transaction fee or gas paid to facilitate the transaction on the DLN.

Precomputed and transactional mixing is believed to allow portable devices, such as smart phones, to send and receive messages, with little extra bandwidth or battery usage, while achieving anonymity for senders and recipients among all messages sent globally in batches defined by short time intervals. To learn anything about which inputs correspond with which outputs of such a batch of messages, the entire cascade of mix devices, each preferably operating independently in a different country, would it is believed have to be compromised. None of the real-time computation, neither by the mixes nor smartphones, uses full public-key operations—resulting it is believed in orders of magnitude performance improvement over previously-known systems. Aspects include untraceable return addresses, group chat, feed-following and large payloads. Transaction protocols include a variety of payments use cases. Limited anonymity and credential mechanism are based on a new approach to user identification disclosed, in which each user provides a small amount of different identifying information to each mix node, so that comparatively little is revealed to each node individually.