Abstract: A computer implemented method and system is described which uses blockchain technology as a storage system for data acquired from a set of digital twins. The blockchain can be used to generate an immutable transaction history of data produced by the set of digital twins. In the case of an error or failure, parties of interest can then access and analyse an immutable record of data. The invention may be used in conjunction with the Bitcoin blockchain or another blockchain protocol.

Abstract: An implementation of the present application provides a computer—implemented method to increase the security of a blockchain—implemented transaction, the transaction including participation from a plurality of participating nodes, each participating node participating as a message originator, selector, and propagator. The method, implemented at a participating node, includes: receiving ciphertext from a prior node and determining whether the participating node is a selector node for said ciphertext received from the prior node. When the participating node is the selector node for said ciphertext, the method includes selecting a subset of said ciphertext, decrypting the selected subset of said ciphertext to provide opted ciphertext and transmitting said opted ciphertext to the next node. When the participating node is other than the selector node for said ciphertext, the method includes decrypting said ciphertext received from the prior node and transmitting the decrypted ciphertext to the next node.

Abstract: A computer-implemented method for transmitting and/or submitting digital content such as feedback for an entity to a blockchain is disclosed. This may be, for example, the Bitcoin blockchain. The method, which is implemented at a first node, includes: submitting, to the blockchain, a first transaction (Tc) for committing a first quantity (x) of tokens to transfer to a second node associated with the entity, the first transaction (Tc) having a first output; generating a first content for submission to the blockchain; and submitting, to the blockchain, a second transaction (Tf1) that returns a second quantity (d) of the committed first quantity (x) of tokens to an address associated with the first node, the second transaction (Tf1) having the first output of the first transaction (Tc) as an input, wherein the first content is used to unlock the first output of the first transaction (Tc).

Abstract: A computer-implemented method is described for enabling recovery of one or more digital assets held on a blockchain by a user under a public key Pk after a corresponding private key Sk for accessing the one or more digital assets is lost. The computer implemented method comprises setting access for the one or more digital assets held on the blockchain under the public key Pk and accessible using the corresponding private key Sk of the user such that the one or more digital assets are also accessible using a private key x shared by a congress on the blockchain network, the congress comprising a group of users on the blockchain network, each member of the congress having a private key share xi, the private key share xi to be used in a threshold signature scheme in which at least a threshold of private key shares must be used to generate a valid signature through the combination of partial signatures of the congress to access the one or more digital assets on behalf of the user.