Nchain Licensing Ag

Nchain Holdings Limited

Stephane Savanah

Craig Steven Wright

Ying Chan

A secure method for exchanging entities via a blockchain is presented. The method comprises receiving, from a user over a communications network, an invitation to perform an exchange of entities; generating a redeem script comprising metadata; hashing the redeem script to generate a redeem script hash; sending the first script and the first script hash on a distributed hash table (DHT); and generating an invitation transaction comprising an output associated with an encrypted digital asset, and a hash of a script comprising an indication of entities to be exchanged, conditions for the exchange, and a public cryptographic key associated with the user.

Blockchain-based exchange with tokenisation

A method () and system () of determining a common secret for two nodes (). Each node () has a respective asymmetric cryptography pair, each pair including a master private key and a master public key. Respective second private and public keys may be determined based on the master private key, master public key and a deterministic key. A common secret may be determined at each of the nodes based on the second private and public keys. In one example, a node () may determine the common secret based on (i) a second private key based on the node's own master private key and the deterministic key; and (ii) a second public key based on the other node's master public key and the deterministic key. The invention may be suited for use with, but not limited to, digital wallets, blockchain (e.g. Bitcoin) technologies and personal device security.

Determining a common secret for the secure exchange of information and hierarchical, deterministic cryptographic keys

A solution for controlling access to a resource such as a digital wallet implemented using a blockchain. Use of the invention during set-up of the wallet can enable subsequent operations to be handled in a secure manner over an insecure channel. An example method comprises splitting a verification element into multiple shares; determining a common secret at multiple nodes in a network; and using the common secret to transmit a share of the verification element between nodes. The shares can be split such that no share is sufficient to determine the verification element and can be stored at separate locations. Upon share unavailability, the share can be retrieved a location accessibility. For safe transmission of the share(s), the common secret is generated at two different nodes independently and used to generate an encryption key for encrypting at least one share of the verification element to be transmitted securely.

Secure multiparty loss resistant storage and transfer of cryptographic keys for blockchain based systems in conjunction with a wallet management system

A method of creating, redeeming, and transferring tokens on a peer-to-peer distributed ledger including generating a blockchain transaction having an output related to a quantity of cryptocurrency, and a hash of a redeem script usable for spending the output. The redeem script comprises metadata, which in turn comprises a token representing a tokenised entity. The redeem script additionally comprises at least one public cryptographic key. The metadata is provided in the redeem script at a location designated in the underlying blockchain protocol as a location for a cryptographic key.

Universal tokenisation system for blockchain-based cryptocurrencies

The invention presents a solution in which blockchain transactions are created to implement the functionality of a logic gate. The invention may be implemented on the Bitcoin platform or an alternative blockchain platform. The transaction includes a locking script which comprises instructions to process Boolean inputs and implement the functionality of a logic gate, such as the XOR gate. When the script is executed, the inputs will be evaluated, using computing agents, to provide an output of TRUE or FALSE, and the output will be subsequently provided to an unlocking script associated with a second transaction attempting to spend the output associated with the locking script. The second transaction is transmitted to the blockchain network for validation and, if determined to be valid (evaluated to a TRUE output), it will be written to the blockchain. Thus, the locking script of the first transaction provides the functionality.

Implementing logic gate functionality using a blockchain

A computer-implemented method () and system () for verifying ownership of a computer software after installation and prior to execution using a distributed hash table () and a peer-to-peer distributed ledger (). This may be the Bitcoin blockchain or an alternative implementation. The method includes determining () a second user public key associated with a second user () from a transaction record stored on the peer-to-peer distributed ledger (). A second public key associated with the second user may be determined () from an entry on the distributed hash table (). The method further includes comparing () the second user public key and the second public key, and verifying () the ownership of the computer software based on the comparing of the second user public key and the second public key.

Method and system for verifying ownership of a digital asset using a distributed hash table and a peer-to-peer distributed ledger

The disclosure relates to a blockchain-implemented system and method of controlling the transmission and/or distribution of digital content. A first user transfers a deposit quantity of cryptocurrency to a common address. A first node associated with the first user: sends a request to the second node to provide an episode of digital content from a series of digital content; determines a payment transaction to transfer a payment quantity of cryptocurrency to the second user based on a quantity of episodes of digital content in the series; and signs and sends the payment transaction to a second node. The second node associated with the second user: receives the request and the payment transaction; verifies the payment transaction; and based on a result of verifying: provides access to the episode of digital content to the first node; and co-signs and sends the payment transaction to a distributed ledger.

Blockchain-implemented method for control and distribution of digital content

A computer-implemented method () and system () for verifying the integrity of a computer software for installation using a distributed hash table () and a peer-to-peer distributed ledger (). This may be the Bitcoin blockchain or an alternative implementation. The method includes determining () a metadata associated with a transaction record stored on the peer-to-peer distributed ledger (). An indication of an entry stored on the distributed hash table () may be determined () from the metadata. The method further includes determining () a third hash value based on the computer software and determining () a fourth hash value from the entry on the distributed hash table (). The method further includes comparing () the third hash value and the fourth hash value and verifying () the integrity of the computer software based on the comparing of the third hash value and the fourth hash value.

Method and system for verifying integrity of a digital asset using a distributed hash table and a peer to-peer distributed ledger

The invention provides methods and systems which enable additional functionality to be inserted into blockchain scripts with ease and in an effective and manner. According to one embodiment, the invention provides a blockchain-implemented method comprising the steps of arranging a plurality or selection of scripting language primitives to provide, upon execution, the functionality of a high-level scripting language primitive, wherein the scripting language is associated with a blockchain protocol; inserting the plurality of scripting language primitives at least once into a script; and inserting the script into blockchain transaction (Tx). The high-level scripting language primitive may perform, for example, an arithmetic operation such as multiplication or division. The scripting language primitives may be called op_codes, words, or commands, and are native to the scripting language. The scripting language may be Script, and the blockchain protocol may be a version of the Bitcoin protocol.

Method for compiling from a high-level scripting language to a blockchain native scripting language

A method and system for controlling a flow execution of a generated script transaction according to a blockchain protocol are disclosed. The method comprises using a software resource to determine how a logic is to be controlled and stored as a portion of code, generate an input by a computing resource as a result of a computation, retrieve the stored portion of code, and insert, based on the input, the stored portion of code into a transaction script associated with a blockchain transaction such that, upon execution of the transaction script. Embodiments allow the generation of a more complex blockchain script, control how the script will execute when implemented on the blockchain, and control how or when an output of the transaction is unlocked.

Method for controlling the flow execution of a generated script of a blockchain transaction

The invention provides a secure method for exchanging entities via a blockchain. The invention incorporates tokenisation techniques, and also techniques for embedding metadata in a redeem script of a blockchain transaction. Embodiment(s) provide a method of: generating a first script, the first script comprising: a first set of metadata associated with a first invitation for the exchange of a first entity by a first user, the first set of metadata comprising an indication of the first entity to be offered for exchange and a first location condition for the exchange, a first user public key (P1A) associated with the first user, wherein the first user public key (P1A) is part of an asymmetric cryptographic pair comprising the first user public key (P1A) and a first user private key (V1A). The script may further comprise and a first third-party public key (P1T) associated with a first third-party, wherein the first third-party public key (P1T) is part of an asymmetric cryptographic pair comprising the first third-party public key (P1T) and a first third-party private key (V1T) The method further comprises the steps of hashing the first script to generate a first script hash and publishing the first script and the first script hash on a distributed hash table (DHT).

Method and system for the secure transfer of entities on a blockchain

A method and system are disclosed for a computing resource to oversee handling and execution of a looping process, comprising: the computing resource monitoring a state of the blockchain to cause one or more transactions to be written to a blockchain, wherein execution of the looping process comprises the computing resource managing and running a loop, the loop having an index representing a current iteration and a limit indicating a total number of iterations of the loop, wherein an iteration of the loop comprises: incrementing the index by one, and executing a code block of the loop containing an if condition then action statement; storing the cryptographic hash in a blockchain transaction and broadcasting the blockchain transaction to the blockchain network to record the execution of the iteration of the loop; and repeating the loop steps until the limit is reached.

Agent-based turing complete transactions integrating feedback within a blockchain system

A computer-implemented method and system are provided that provides functionality of a portion of source code, written in a high-level language (HLL), on a blockchain platform. The method and system comprise the steps of receiving a portion of source code as input, wherein the portion of source code is written in a high-level language, HLL; and generating an output script comprising a plurality of op_codes selected from and/or native to a blockchain scripting language such that, when executed, the output script provides, at least in part, a functionality specified in the portion of source code, the blockchain scripting language restricted from supporting recursive programming constructs.

System and method for compiling high-level language code into a script executable on a blockchain platform

A method of encrypting data at an electronic device where the electronic device is associated with a key device. Each device is associated with an asymmetric cryptography pair, each pair including a first private key and a first public key. Respective second private and public keys may be determined based on the first private key, first public key and a deterministic key. A secret may be determined based on the second private and public keys. The data at the electronic device may be encrypted using the determined secret or an encryption key that is based on the secret. Information indicative of the deterministic key may be sent to the key device where the information may be stored.

Personal device security using cryptocurrency wallets

The invention provides a generic operating system for coordinating, controlling and/or influencing the activities of a device. The invention is implemented using a blockchain platform with which the operating system is arranged to interact. The blockchain may be the Bitcoin blockchain. In a preferred embodiment, the device is an Internet of Things (TOT) device. The invention provides a computer-implemented control system and corresponding method for controlling a device, the system comprising a device configured for wireless communication with a network and having an IP address and a public-private key cryptographic key pair associated with the device; a software-implemented control component arranged to monitor the state of a blockchain network and/or transmit blockchain Transactions to the blockchain network; and a set of instructions arranged for execution by the control component to control the functionality of the device. The control component is arranged to access the set of instructions from a stored location, which is separate to the device. The instructions may be stored in a Distributed Hash Table (DHT) and accessed for download and installation by the control component from the DHT as and when needed. The location of the DHT and/or instructions may be indicated or provided using metadata provided within a blockchain transaction. The set of instructions may be accessed by the control component using a look-up key, which is related to a cryptographic key pair. The control component is provided on or in the device, or in other embodiments can be provided in an off-device location and arranged for wireless communication with the device.

Growing community of inventors

London, United Kingdom

Stephane Savanah