Nchain Licensing Ag

Alessio Pagani

Craig Steven Wright

Wei Zhang

Chloe Ceren Tartan

Michaella Pettit

Brad Kristensen

A method of using a tree structure overlaid on a blockchain, wherein each node of the tree is a different transaction. The method comprises: inspecting the blockchain to identify at least part of the tree structure, including identifying a target child node which includes a record of a file in the respective payload of that node, and identifying a path comprising one or more edges back through the tree structure from the target child node to the root node. The method then comprises: A) for each edge along the identified path from target child node back to root node, checking that the respective child node is signed by a key associated with the respective parent node, and B) checking that a current instance of the file matches the record included in the target child node. The current instance of the file is verified at least on condition of these checks.

File verification system and method

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.

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London, United Kingdom

Alessio Pagani