Abstract: Provided herein are systems, devices and methods for transferring cryptocurrency from a limited access cryptocurrency wallet. The limited access cryptocurrency wallet may create, in advance, provisional account(s) allocated for respective recipient(s) and transfer a predefined overall value of cryptocurrency from its associated account associated to the provisional account(s). The limited access cryptocurrency wallet may further generate, in advance, a plurality of signed transactions for transferring a plurality of predefined partial values of cryptocurrency from the provisional account(s) to receiving account(s) associated with the recipient(s) and transmit the plurality of signed transactions to a network connected device. Later, in real-time, the network connected device may transmit one or more of the plurality of signed transactions for transferring cryptocurrency from the provisional account(s) to the receiving account(s) without physically attending to the limited access cryptocurrency wallet.

Abstract: Described herein are methods and devices for updating digital assets transactions in an isolated device, comprising the isolated device (1) receiving limited length string(s) indicating a value of digital assets transferred from one or more other devices to an account associated with the isolated device in one or more transactions each recorded in a blockchain with a respective identifier computed based on input value(s) of the respective transaction which corresponds to output value(s) of previous transaction(s) which the isolated device is informed of and are stored in a predefined order in a depository allocated for the isolated device in the other device(s), (2) inferring the respective identifier of each transaction according to the output value(s) of the previous transaction(s) identified based on the transferred value according to the predefined order and, (3) updating the isolated device with a digital assets balance of the associated account according to the transaction(s).

Abstract: There is provided a requestor device for digital signing of a message, comprising: at least one hardware processor executing a code for: transmitting the message for signing thereof, in a single request session over the network to each one of a plurality of validator devices, wherein a beacon device computes and transmits over a network to each one of a plurality of validator devices a signature-data value computed and signed by the beacon device, receiving in a single response session from each one of the plurality of validator devices, a respective partial-open decrypted value computed for the signature-data value and the message, and aggregating the partial-opens decrypted values received from the plurality of validator devices to compute the digital signature of the message.

Abstract: There is provided a requestor device for digital signing of a message, comprising: at least one hardware processor executing a code for: transmitting the message for signing thereof, in a single request session over the network to each one of a plurality of validator devices, wherein a beacon device computes and transmits over a network to each one of a plurality of validator devices a signature-data value computed and signed by the beacon device, receiving in a single response session from each one of the plurality of validator devices, a respective partial-open decrypted value computed for the signature-data value and the message, and aggregating the partial-opens decrypted values received from the plurality of validator devices to compute the digital signature of the message.

Abstract: Provided herein are systems, devices and methods for transferring cryptocurrency from a limited access cryptocurrency wallet. The limited access cryptocurrency wallet may create, in advance, provisional account(s) allocated for respective recipient(s) and transfer a predefined overall value of cryptocurrency from its associated account associated to the provisional account(s). The limited access cryptocurrency wallet may further generate, in advance, a plurality of signed transactions for transferring a plurality of predefined partial values of cryptocurrency from the provisional account(s) to receiving account(s) associated with the recipient(s) and transmit the plurality of signed transactions to a network connected cryptocurrency wallet.

Abstract: Methods, system and devices for sharing a secret between an isolated device connected to a network through a transmit-only unidirectional secure channel and a network connected user device, comprising generating a secret value divided to first and second components, transmitting the first component, via the unidirectional secure channel, to one or more computing nodes of a distributed system, and transferring the second component, via a tamper-resistant unidirectional insecure channel, to the network connected user device associated with the user to enable the network connected user device to reproduce the secret value by combining the first component received from one or more of the computing nodes with the second component.

Abstract: A method of validating a multi-party consensus over a limited connection comprising a validating device configured to transmit a query having a finite number of possible valid answers to a plurality of computing nodes via a unidirectional secure communication channel, receive a limited length string computed based on an aggregated response aggregating a plurality of responses each computed for a multi-party consensus answer to the query by each of at least some of the plurality of computing nodes using a respective secret component, compute a plurality of locally computed strings each computed based on a respective one of the finite number of possible valid answers using an aggregated secret aggregating the plurality of secret components, validate the multi-party consensus answer by comparing the received limited length string to each of the plurality of locally computed strings and initiating one or more operations according to an outcome of the validation.

Abstract: There is provided a requestor device for digital signing of a message, comprising: at least one hardware processor executing a code for: transmitting the message for signing thereof, in a single request session over the network to each one of a plurality of validator devices, wherein a beacon device computes and transmits over a network to each one of a plurality of validator devices a signature-data value computed and signed by the beacon device, receiving in a single response session from each one of the plurality of validator devices, a respective partial-open decrypted value computed for the signature-data value and the message, and aggregating the partial-opens decrypted values received from the plurality of validator devices to compute the digital signature of the message.

Abstract: There is provided a requestor device for digital signing of a message, comprising: at least one hardware processor executing a code for: transmitting the message for signing thereof, in a single request session over the network to each one of a plurality of validator devices, wherein a beacon device computes and transmits over a network to each one of a plurality of validator devices a signature-data value computed and signed by the beacon device, receiving in a single response session from each one of the plurality of validator devices, a respective partial-open decrypted value computed for the signature-data value and the message, and aggregating the partial-opens decrypted values received from the plurality of validator devices to compute the digital signature of the message.

Abstract: A digital wallet device for storing and securing cryptocurrency, the digital wallet device is electronically disconnected from other digital devices and comprising: a cryptocurrency integrated circuit (IC) that is isolated from any computer interface; a non-transitory computer readable storage medium mounted on the cryptocurrency IC and storing a private key of a cryptocurrency and a public key of the cryptocurrency; a man-machine interface (MMI) for receiving an input from a user; at least one processor mounted on the cryptocurrency IC for executing code to create a cryptocurrency action based on the input and to sign using the private key; and a unidirectional communication hardware for sending said transaction to a communication device for broadcasting said transaction via a network.