Abstract: A computer-implemented method of generating a blockchain address based on a corresponding template output script of a blockchain transaction, wherein the blockchain address comprises a prefix component and a data component, and wherein the method is performed by a first party and comprises: generating a first blockchain address based on a first template output script, the first blockchain address comprising a first prefix component for identifying a first template output script, and a first data component representing one or more data items required to populate the first template output script; wherein the first prefix component is greater than one byte, and/or wherein the first data component is generated based on a plurality of data items required to populate the first template output script.

Abstract: A computer-implemented method of accepting blockchain transactions, wherein the method is performed by a blockchain node of a blockchain network and comprises: generating a first transaction comprising a first output, the first output comprising a first output script; causing the first transaction to be published on the blockchain; receiving a second transaction comprising a second output, the second output comprising a second output script; and accepting the second transaction based on one or more conditions being met, wherein a first condition of said one or more conditions is that the second output script corresponds to the first output script.

Abstract: A computer-implemented method of generating a seed for deriving one or more private keys, wherein the method comprises: obtaining one or more biometric readings; and for each of the one or more biometric readings: identifying a plurality of biometric features; generating a plurality of respective first binary representations, wherein at least some of the first binary representations are generated based on respective sets of the plurality of biometric features, and wherein the first binary representations preserves physical differences between the biometric features; and generating a respective second binary representation, each respective second binary representation being generated based on the respective first binary representations; wherein the method further comprises generating a seed based on the respective second binary representations.

Abstract: A computer-implemented method of storing a biometric vault system on a blockchain, wherein the biometric vault system comprises one or more biometric vaults, each biometric vault locking a respective secret value, and wherein the method comprises: obtaining at least one biometric reading; identifying a plurality of biometric features from the at least one biometric reading; generating one or more first biometric vaults; generating one or more blockchain transactions, wherein each blockchain transaction comprises a respective output comprising at least part of a respective second biometric vault, wherein each second biometric vault comprises a respective first biometric vault; and transmitting the one or more blockchain transactions to the blockchain network.

Abstract: 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.

Abstract: 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.