There is provided a computer-implemented method, a computer system and a cryptocurrency depository for enabling secure escrow and safekeeping of a cryptocurrency. The computer implemented method starts by establishing a secure communication between a first party device associated with a depositor of the cryptocurrency and a second party device associated with a secure cryptocurrency depository, in a cryptocurrency network. The secure cryptocurrency depository is a secure cryptocurrency escrow and/or a secure cryptocurrency vault. Further, the first party device and/or the second party device is enabled to transfer the available funds/tokens away from the multi-signature address using the second partially signed provisional transaction template and/or the first partially signed provisional transaction template in possession of the first party device and second party device respectively, in case the first party and/or second party private-keys/secrets and/or the hardware tokens are lost/stolen, thereby preventing theft.

Provided is a secure computation device for computing a comparison operation to two integers without the use of AND/XOR. The secure computation device compares a first integer a and a second integer b when the first integer a and the second integer b, which are 0 or greater and less than 2{circumflex over ( )}k (k being an integer of 1 or greater), are subjected to ring sharing. The secure computation device includes: an addition/subtraction circuitry; a bit decomposition circuitry; and a bit extraction circuitry. The addition/subtraction circuitry uses the first integer a, the second integer b, and 2{circumflex over ( )}k to carry out a predetermined addition or subtraction with ring sharing, and output an added/subtracted result. The bit decomposition circuitry converts the added/subtracted result to bit sharing, and outputs a bit shared result. The bit extraction circuitry extracts a (k+1)-th bit of the bit shared result, and outputs an extracted result.

There is provided a secure cryptocurrency depository having an associated second party device in communication with a first party device associated with a first party, in a cryptocurrency network, wherein the secure cryptocurrency depository is a secure cryptocurrency escrow and/or a secure cryptocurrency vault.

A computer-controlled diagnostic network system. The system includes diagnostic devices and diagnostician devices located at different locations in a distributed secured network. The system includes a computer-controlled central blockchain server for storing and processing details obtained from the diagnostic devices and the diagnostician devices. The computer-controlled central blockchain server is communicatively coupled to a data extraction device for retrieving a plurality of computer-executable files stored at discrete distributed locations associated with one or more users of the distributed secured network. The computer-controlled central blockchain server is communicatively coupled to a blockchain device to process blockchain tasks through blockchain-enabled and computer-controlled software and hardware tools. The computer-controlled central blockchain server is located at a location remote from the locations of the diagnostic devices and the diagnostician devices.

There is provided an unrecoverable hardware token in possession of each of a first party and/or a second party having stored therein, private-keys/secrets, generated during initialization. The unrecoverable hardware token is required to be physically accessed to sign transactions using them. Further, the unrecoverable hardware token associated with each of the first party and/or the second party is configured to generate a signature using internally stored private-keys/secrets to authenticate transactions. Furthermore, the unrecoverable hardware token is configured to provide out-of-band authentication by preventing any backup or recovery of the private-keys/secrets stored therein.

Provided is a secure computation device for computing a comparison operation to two integers without the use of AND/XOR. The secure computation device compares a first integer a and a second integer b when the first integer a and the second integer b, which are 0 or greater and less than 2{circumflex over ( )}k (k being an integer of 1 or greater), are subjected to ring sharing. The secure computation device includes: an addition/subtraction circuitry; a bit decomposition circuitry; and a bit extraction circuitry. The addition/subtraction circuitry uses the first integer a, the second integer b, and 2{circumflex over ( )}k to carry out a predetermined addition or subtraction with ring sharing, and output an added/subtracted result. The bit decomposition circuitry converts the added/subtracted result to bit sharing, and outputs a bit shared result. The bit extraction circuitry extracts a (k+1)-th bit of the bit shared result, and outputs an extracted result.

An example operation may include one or more of identifying a blockchain transaction requiring peer endorsement, transmitting a request for endorsement to one or more peers assigned to a blockchain, receiving endorsement response messages from the one or more peers, wherein the endorsement response messages comprise a plurality of priorities assigned to the blockchain transaction, and forwarding the received plurality of priorities and the blockchain transaction to an ordering node for assignment to the peers.

A computer-controlled diagnostic network system. The system includes diagnostic devices and diagnostician devices located at different locations in a distributed secured network. The system includes a computer-controlled central blockchain server for storing and processing details obtained from the diagnostic devices and the diagnostician devices. The computer-controlled central blockchain server is communicatively coupled to a data extraction device for retrieving a plurality of computer-executable files stored at discrete distributed locations associated with one or more users of the distributed secured network. The computer-controlled central blockchain server is communicatively coupled to a blockchain device to process blockchain tasks through blockchain-enabled and computer-controlled software and hardware tools. The computer-controlled central blockchain server is located at a location remote from the locations of the diagnostic devices and the diagnostician devices.

An example operation may include one or more of identifying a blockchain transaction requiring peer endorsement, transmitting a request for endorsement to one or more peers assigned to a blockchain, receiving endorsement response messages from the one or more peers, wherein the endorsement response messages comprise a plurality of priorities assigned to the blockchain transaction, and forwarding the received plurality of priorities and the blockchain transaction to an ordering node for assignment to the peers.

An example operation may include one or more of identifying a blockchain transaction requiring peer endorsement, transmitting a request for endorsement to one or more peers assigned to a blockchain, receiving endorsement response messages from the one or more peers, wherein the endorsement response messages comprise a plurality of priorities assigned to the blockchain transaction, and forwarding the received plurality of priorities and the blockchain transaction to an ordering node for assignment to the peers.