Nchain Licensing Ag

Jad Wahab

Craig Steven Wright

Wei Zhang

Chloe Ceren Tartan

Jack Owen Davies

Owen Vaughan

Bassem Ammar

Brock Doiron

Antoaneta Serguieva

Alexander Tennyson Mackay

Alexander MacKay

A method of validating transactions for recordal in a blockchain comprises receiving one or more transactions at a node of a blockchain network. For each received transaction a protocol for validating the transaction is applied. The protocol is configured to allow a termination opcode to be included in an output script of the transaction. The termination opcode is configured to, upon being executed by the node, a) terminate execution of the output script, and b) not to invalidate the transaction based only on the inclusion of the termination opcode in the output script. The protocol is also configured to disallow any instance of the termination opcode from being included in an input script of the transaction, said disallowing comprising the node at least invalidating the transaction if any instance of the termination opcode is included in the input script.

Protocol for validating blockchain transactions

A method of executing transactions of a blockchain network. A first transaction comprises at least a first output comprising a first locking script of a stack-based scripting language, the first locking script comprising a portion of the first locking script to be executed before a first instance of an opcode is executed. A second transaction comprises a first unlocking script that references the first output in the first transaction. Upon executing the first instance of the opcode, execution of the first locking script is terminated whilst not invalidating the first transaction. A first data element is read from at least one stack, wherein the first data element is generated during execution of the first unlocking script and the portion of the first locking script. The first data element as read from the at least one stack is supplied to an off-chain function, wherein the function is configured to generate a result based on at least said first data element.

Using blockchain transactions to provide off-chain functionality

A computer-implemented method comprising, at a verifying nodes of a blockchain network: obtaining a first transaction which comprises runnable code; receiving a second transaction which includes information comprising at least a submitted instance of an r-part and an s-part of a first ECDSA signature, and further comprising a nonce; and miming the code from the first transaction. The code is configured to verify that H(ƒ(r, d)) meets a predetermined condition defined in the code, and to return a result of true on condition thereof, where r is the submitted instance of the r-part, d is the nonce, His a hash function, and f is a function combining q and d.

Blockchain transaction comprising runnable code for hash-based verification

A method of executing a transaction of a blockchain. The transaction comprises at least one output comprising a locking script, and the locking script comprises an instance of a first opcode and one or more instances of a second opcode. Each instance of the second opcode separates portions of the locking script. Upon calling the instance of the first opcode, a first data element is read from at least one stack, the first data element being generated during execution of the locking script with an unlocking script of a different transaction. A first part of the locking script that follows an instance of the second opcode corresponding to the first data element is output.

In-script functions within a blockchain transaction

A computer-implemented method for controlling one or more devices of a first network. The first network comprises a set of bridging nodes and a set of devices controllable by one or more of the set of bridging nodes. Each bridging node is also a node of a blockchain network, and each device has a respective device identifier. The method is performed by a first one of the bridging nodes and comprises generating a first blockchain transaction. The first blockchain transaction comprises a first input comprising a signature linked to a first public key of the first node, and a first output comprising command data. The command data comprises a respective identifier of a first one of the devices controlled by a second one of the bridging nodes, and a command message for controlling the first device.

Request and response protocol using blockchain transactions

A computer-implemented method for granting permission to a requestor to join a first network. The first network comprises a set of bridging nodes and a set of devices controllable by one or more of the set of bridging nodes. Each bridging node is also a respective node of a blockchain network. The method is performed by a registration authority and comprises generating a first blockchain transaction. The first blockchain transaction comprises an input comprising a signature linked to a first public key of the registration authority. The first blockchain transaction also comprises a first output comprising a first certificate, the first certificate comprising an identifier assigned to the requestor. The method further comprises transmitting the first blockchain transaction to the blockchain network for inclusion in the blockchain.

Communication protocol using blockchain transactions

At least one proof transaction is received at a node of a blockchain network and comprises at least one Elliptic Curve Digital Signature Algorithm (ECDSA) signature and at least one zero-knowledge proof (ZKP) component. The node verifies the ECDSA signature of the at least one proof transaction based on a public key associated with the ECDSA signature and a signed part of the at least one proof transaction, and determined whether the ZKP component is correct for the ECDSA signature and a defined hash value and a defined hash function, in that it proves an ephemeral key counterpart to an r-part of the ECDSA signature to be a preimage of the defined hash value with respect to the defined hash function.

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London, United Kingdom

Jad Wahab