Nchain Licensing Ag

Huawei Technologies Co., Limited

Wei Zhang

Craig Steven Wright

Jack Owen Davies

Chloe Ceren Tartan

Owen Vaughan

Bassem Ammar

Jad Wahab

Steven Patrick Coughlan

Brock Doiron

Andrew James Mee

Michaella Pettit

Alexander Tennyson Mackay

Alexander MacKay

Zhen Yang

Zhenguo Li

Alessio Pagani

Hang Xu

Alex Mackay

Xinyue Cai

Xinhai Zhao

A computer-implemented method of enforcing conditions on a second blockchain transaction using a first blockchain transaction, wherein a first one of the conditions is that, when a first unlocking script of the second transaction is executed alongside a first locking script of the first transaction, a representation of the second transaction is output to memory, wherein the representation is based on a plurality of fields of the second transaction and a first output of the first transaction, and wherein the method comprises: generating the first transaction, wherein the first transaction comprises a first output, wherein the first output comprises the first locking script, and wherein the first locking script comprises: a message sub-script; a signature sub-script; a public key corresponding to a private key; and a verification sub-script.

Enforcing conditions on blockchain transactions

Methods and systems for registering identity of a mining node on a blockchain in a blockchain network. The methods may include creating a validity-check transaction having a first output controlled by the mining node and containing a miner identifier and propagating the validity-check transaction on the blockchain network. The methods may further include mining, by the mining node, a new block containing a generation transaction, wherein the generation transaction includes an information field that contains the miner identifier and a reference to the validity-check transaction. Another node may validate identity by receiving the miner identifier and the reference to the validity-check transaction, retrieving the validity-check transaction to confirm it contains the miner identifier, and determining that the first output is an unspent transaction output.

Methods and devices for registering and authenticating miner identity in a blockchain network

A method of enabling knowledge proof in a blockchain transaction is disclosed. The method comprises sending, from a verifier to a prover, a blockchain transaction redeemable by means of data including (i) first data (y) based on a combination of an ephemeral key (r), second data (c) and a private key of a public-private key pair of a cryptography system, wherein the public key (v) is based on an integer generator raised to a first power, wherein the first power is based on the private key, and wherein knowledge of the private key is required in order to determine the ephemeral key from the first data, and (ii) third data (x) based on the integer generator raised to a second power, wherein the second power is based on the ephemeral key.

Computer implemented method and system for knowledge proof in blockchain transactions

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

According to a first aspect, there is provided a computer-implemented method of cryptographically linking multiple documents, having multiple electronic signature requirements, via a sequence of blockchain transactions, the method comprising: computing document signature data satisfying a first signature requirement for an existing document, the first signature requirement defined in a blockchain transaction containing or referencing the existing document; wherein the document signature data signs a portion of a linking transaction containing or referencing a supplementary document, the linking transaction comprising an input for validly spending a spendable output of the blockchain transaction, whereby the document signature cryptographically links the supplementary document with the existing document; and wherein the signed portion comprises multiple outputs of the linking transaction; wherein a first of the multiple signed outputs is spendable and associated with the existing document, the signed portion defining a second signature requirement for the existing document; and wherein a second of the multiple signed outputs is spendable and associated with the supplementary document, the signed portion defining a signature requirement for the supplementary document.

Electronic document signatures

A public key may be recorded on the blockchain by a certificate authority in such a manner that any third party may quickly and easily verify that the public key is certified by the certificate authority and that the certification has not been revoked. The certificate authority may be able to revoke the certification nearly instantaneously, and/or may be able to simultaneously certify a new key for the same entity while revoking the old key. The verification may be incorporated into a new transaction so that there is no gap between reliance on the certificate and the verification of its validity. In some cases, each transaction in which the certificate is used may also serve as linked certificate transaction that renews the certificate to enable a subsequent use.

Methods and devices for automated digital certificate verification

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 of deriving keys of a hierarchical key structure, wherein the method is performed by a first party and comprises: generating a target index of a target child key, wherein the target index is generated based on a first result of inputting at least a target message to a first hash function; and deriving the target child key of a level in a hierarchy of a key structure based on a) a parent key of a preceding level in the hierarchy, and b) a second result of inputting at least i) the parent key, and ii) the target index, to a second hash function.

Key derivation method

Methods and devices for propagating blocks in a blockchain network. At a mining node, while hashing a first block header of a first candidate block, the mining node sends, to other mining nodes, a first message specifying transactions and their order in a first ordered set of transactions contained in the first candidate block. The mining also receives a second message specifying transactions and their order in a second ordered set of transactions contained in a second candidate block being mined by a second mining node. If the mining node succeeds in mining the candidate block it notifies other mining nodes by providing them with a coinbase transaction, hash value, and timestamp. If another mining node is successful, then the mining node receives information from the other mining node from which, in conjunction with the second message, it can assemble the second candidate block and validate it.

Methods and devices for propagating blocks in a blockchain network

Methods and devices to enable the splitting of storage and validation functions from mining function in a blockchain network. The storage and validation nodes create candidate blocks and collect block rewards from successfully mined blocks. The mining nodes provide hash power for mining the candidate blocks and received resources from the storage and validation node for successful mining of a candidate block. Atomic exchange mechanisms are described for preventing loss and fraud and minimizing the use of bandwidth by mining nodes.

Methods and devices for secure symbiotic mining

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 blockchain network may be used to improve upon public-key infrastructure by providing for fast and secure registration, revocation and update of digital certificates. A public key may be recorded on the blockchain by a certificate authority in such a manner that any third party may quickly and easily verify that the public key is certified by the certificate authority and that the certification has not been revoked. The certificate authority may be able to revoke the certification nearly instantaneously, and/or may be able to simultaneously certify a new key for the same entity while revoking the old key. In some cases, the ability to revoke a certification may be given to the owner of the public key or, in some cases, to one or even a group of other entities.

Methods and devices for public key management using a blockchain

A computer-implemented method of providing proof that a data item of a blockchain transaction exists on a blockchain, wherein the method comprises: obtaining, from a requesting party, target data item of a target blockchain transaction; obtaining the target blockchain transaction; obtaining a target Merkle proof for the target blockchain transaction, wherein a corresponding target Merkle root is contained within a block of the blockchain, and wherein obtaining the target Merkle proof comprises calculating an index of a target transaction identifier of the target blockchain transaction within a leaf layer of a corresponding target Merkle tree; and outputting at least the target Merkle proof for use by the requesting party as proof that the target data item exists as part of the target blockchain transaction on the blockchain.

Merkle proof entity

This application provides an image processing method, a network training method, and a related device, and relates to image processing technologies in the artificial intelligence field. The method includes: inputting a first image including a first vehicle into an image processing network to obtain a first result output by the image processing network, where the first result includes location information of a two-dimensional (2D) bounding frame of the first vehicle, coordinates of a wheel of the first vehicle, and a first angle of the first vehicle, and the first angle of the first vehicle indicates an included angle between a side line of the first vehicle and a first axis of the first image; and generating location information of a three-dimensional (3D) outer bounding box of the first vehicle based on the first result.

Image processing method, network training method, and related device

Methods and system of recording work history of a mining node on a blockchain in a blockchain network. The methods may include mining a first block containing a registration generation transaction that includes, within a registration information field, a miner identifier for the mining node; and mining two or more additional blocks in an order, each additional block containing a generation transaction that includes an information field containing the miner identifier, a reference to the generation transaction of the preceding additional block in the order, wherein the registration generation transaction is a first block in the order. Work history may be verified by tracing the recorded work history and validating the miner identifier. Recorded work history may serve as the basis for a reputation score for the miner, which reflects contributed work evidenced by the proof-of-work secured work history.

Growing community of inventors

London, United Kingdom

Wei Zhang