Dreamworks Animation LLC

Blockchain Innovation, LLC

Atul Patil

Matthew Christopher Gong

Esteban D Papp

Stuart Bryson

Kirk Lansman

Austin Trombley

Liang Cheng

Systems and methods for implementing a command stack for an application are disclosed and an embodiment includes receiving an input for executing a first command of the application, initiating execution of the first command, executing one or more second commands which are set to execute based on execution of the first command, completing execution of the first command, and including the first command in the command stack such that an association is defined between the first command and the one or more second commands. In one embodiment, defining the association in the command stack between the first command the one or more second commands may include generating a first nested command stack associated with the first command, including the one or more second commands in the first nested command stack, and including the first command and the first nested command stack in the command stack.

Extensible command pattern

In a blockchain network, a 'cold wallet' allows users to securely create and store their private key and sign their transaction data only when the wallet is completely offline. When a user requests a transaction, a user key tag that identifies the user's key is determined. The transaction data and the user's key tag are transmitted to a cold wallet that includes an HSM Trusted Client and an HSM over a first one-way communication channel during a window in a first sequence of connection windows. Inside the cold wallet, the HSM Trusted Client uses the user key tag to determine an encrypted version of the user's signing key. During a processing window, the transaction data and encrypted signing key are transmitted to the HSM, where a cleartext key is recovered and used to sign the transaction, and the signed transaction is transmitted back to the HSM Trusted Client. During a second connection window, the signed transaction is transmitted from the HSM Trusted Client for transmission to the blockchain network. The processing and connection windows do not overlap. The one-way communication paths combined with the non-overlapping connection and processing prevent unauthorized access to the signing keys.

Apparatus and methods of air-gapped crypto storage using diodes

An air-gapped system enables the secure transfer and control of digital assets, such as those associated with crypto-currency. The system includes an Integration Server for receiving requests from an application interface, a Central Control Center for verifying the requests received and authorizing the requests using digital signatures, and multiple Distributed Data Centers, each including a cold Data Center Hardware Security Module (DC HSM). These DC HSMs securely store and manage cryptographic keys. Each Data Center also includes an offline Processing Unit coupling its DC HSM to a dedicated Remote Controlled Server. The Remote Controlled Server receives requests from the Integration Server and forwards them to the Processing Unit of a DC HSM using a Near-Field Communication (NFC) Interface between the two. Preferably, the NFC interface is physically shielded to resist side channel attacks.

Apparatus and methods for remote controlled cold storage of digital assets using near field communication tags

Growing community of inventors

Indore, India

Atul Patil