본 발명은 당사자간에 블록체인을 갖는 디지털 가상화폐의 거래 시마다 32바이트(byte) 이상으로 이루어진 퍼블릭 어드레스를 인지하지 않고서도 URL 기반으로 간편하게 거래를 수행할 수 있게 안내하여 줌으로써, 별도의 비트코인 결제용 QR코드를 구비하지 않아도 거래가 가능하여 블록체인을 갖는 디지털 가상화폐 거래에 수반되는 비트코인 결제용 QR코드의 폐해인 양 당사자 간의 비트코인 거래시마다 모든 상대방의 비트코인 결제용 QR코드를 사전에 일일이 제공받아야 하는 불편함과 더불어 블록체인을 갖는 디지털 가상화폐 거래 시에 이를 촬영하면서 거래를 수행해야 하기 때문에 그 과정이 복잡할 뿐만 아니라 증여자가 사전에 제공받은 수증자들의 비트코인 결제용 QR코드가 외부 유출 시 이에 따른 도용의 위험성도 사전에 예방시켜주는 당사자간 블록체인을 갖는 디지털 가상화폐의 거래시스템 및 방법에 관한 것으로, 블록체인을 갖는 디지털 가상화폐 거래용 트랜잭션정보가 전송 시 그 전송된 블록체인을 갖는 디지털 가상화폐 거래용 트랜잭션정보를 검증을 통해 블록체인 기반 디지털 가상화폐 거래를 인증하고, 그 인증에 따라 블록체인을 갖는 디지털 가상화폐 거래용 트랜잭션정보가 기록되는 블록체인이 탑재된 블록체인 보유서버(100)들과; 증여자용 거래요청신호가 전송되면, 그 블록체인을 갖는 디지털 가상화폐를 증여받는 수증자를 인지할 수 있게 안내하는 수증자 인지용 URL(A)을 생성하여 전송하고, 수증자 인증용 신상내역신호가 전송되면, 증여자가 전자지갑에 보유하고 있는 블록체인 기반 디지털 가상화폐 금액정보에서 수증자에게 증여하고자 하는 금액만큼 차감하고, 그 차감된 금액만큼 수증자의 전자지갑의 블록체인 기반 디지털 가상화폐 금액정보에 누적시키는 거래내역으로 이루어지는 디지털 가상화폐 거래용 트랜잭션 정보를 생성하여 이를, 상기 블록체인 보유서버(100)들에게 전파되도록 제어하는 블록체인 기반 디지털 가상화폐 거래안내서버(200)와; 증여하고자 하는 블록체인을 갖는 디지털 가상화폐의 금액정보 및 증여자의 신상정보를 포함하는 증여자용 거래요청신호를 생성하고 이를 상기 디지털 가상화폐 거래안내서버(200)로 전송하며, 상기 디지털 가상화폐 거래안내서버(200)로부터 전송되는 상기 수증자 인지용 URL(A)을 전해주고자 하는 수증자를 지정하여 전송할 수 있게 안내하는 증여자측 블록체인 기반 디지털 가상화폐거래용 앱(310)이 탑재된 증여자 단말기(300)와; 상기 증여자 단말기(300)로부터 수증자 인지용 URL(A)이 전송된 수증자 인지용 URL(A)을 클릭 시 자동으로 실행되어, 블록체인을 갖는 디지털 가상화폐를 증여받는 수증자의 신상정보를 포함하는 수증자 인증용 신상내역신호를 생성하고 이를 상기 디지털 가상화폐 거래안내서버(200)로 전송되도록 제어하는 수증자측 블록체인 기반 디지털 가상화폐거래용 앱(410)이 탑재된 수증자 단말기(400);로 이루어진 시스템 및 이를 이용한 방법을 제공한다.

The invention provides a method and corresponding system for controlling a blockchain transaction output and/or specifying the recipient of the output. It also provides a method of controlling and/or generating an electronic communication. The invention is a blockchain-implemented solution, which may or may not be the Bitcoin blockchain. In a preferred embodiment of the invention, the method may comprise the step of sending an electronic notification to a notification address which is provided as metadata within an unlocking script of an input of a transaction (Txi) on a blockchain. The unlocking script is provided in order to spend an output from a further transaction (Tx2) on the blockchain. The input of the transaction (Txi) and/or the output of the further transaction (Tx2) may be associated with a tokenised asset represented on, or referenced via, the blockchain. The notification address may be associated with an asset or resource represented on the blockchain, or a controller of an asset or resource represented on the blockchain. The notification address may be a network address, a cryptographic key, a uniform resource locator (URI), email address or any other address or identifier which can be represented in the metadata of a transaction script and used as a destination for an electronic communication.

The invention relates to blockchain technologies such as, for example, the Bitcoin blockchain. It provides a method (and corresponding system) of generating public keys for a linked structure of entities, wherein a function is applied to a deterministic key to generate the public key, the deterministic key being generated by applying a hash function to either a parent entity identifier to generate a parent deterministic key, or to a sum of the parent deterministic key and a child entity identifier to generate a child deterministic key. There is also provided a computer-implemented method for accounting on transactions with entities, the transaction being recorded in a peer-to- peer distributed ledger (blockchain), the method comprising: associating public addresses of the entities with one or more identifiers of a first classification type to classify the public addresses based on the first classification type; receiving, from a communication network, a first identifier of the one or more identifiers of the first classification type; determining a first set of public addresses associated with the first identifier, wherein the first set of public address is a subset of the public addresses; and determining a first set of transactions in the peer-to-peer distributed ledger based on the first set of public addresses associated with the first identifier, wherein the first set of transactions is a subset of the transactions.

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 (IOT) 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.

The disclosure relates to a blockchain-implemented system and method of controlling the transmission and/or distribution of digital content. In an illustrative embodiment, the blockchain is the Bitcoin blockchain. The first user (5) is associated with a deposit quantity of cryptocurrency at a common address (23), wherein to spend from the common address requires signatures of both a first private key of the first user (5) and a second private key of the second user (7). The system (1) comprises a first node (15) and a second node (17).- The first node (15) is associated with a first user (5) comprising a first processing device configured to: (A) send, over a communications network (8), a request to the second node (17) to provide an episode of digital content from a series of digital content; (B) determine a payment transaction (27) to transfer from a common address (23) a payment quantity of cryptocurrency to the second user (7), wherein the payment quantity of cryptocurrency is based on a quantity of episodes of digital content in the series of digital content requested by the first user (5); and (C) sign, with the first private key (V ), the payment transaction (27) and subsequently send the payment transaction (27) to the second node (17). The second node (17) is associated with the second user (7) comprising a second processing device configured to: (I) receive, over the communications network (8), the request from the first node (15) to provide the episode of digital content and the payment transaction (27), signed with the first private key; (II) verify the payment transaction, comprising verifying that the payment transaction includes the payment quantity of cryptocurrency to the second user (7), and based on the result of verifying the second processing device is further configured to: (III) provide access, over the communications network (8), to the episode of digital content (i) to be available to the first node (15); and (IV) co-sign, with the second private key of the second user (5), the payment transaction and send the co-signed payment transaction to a distributed ledger (blockchain) (9).