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    COMPUTER-IMPLEMENTED SYSTEM AND METHOD FOR GENERATING AND EXTRACTING USER RELATED DATA STORED ON A BLOCKCHAIN
    3.
    发明公开
    COMPUTER-IMPLEMENTED SYSTEM AND METHOD FOR GENERATING AND EXTRACTING USER RELATED DATA STORED ON A BLOCKCHAIN 审中-公开

    公开(公告)号：EP3996021A1

    公开(公告)日：2022-05-11

    申请号：EP21204249.3

    申请日：2018-01-29

    申请人： Nchain Holdings Limited

    发明人： SEWELL, Martin ,  VSEVOLOZHSKY, Vera ,  WRIGHT, Craig Steven

    IPC分类号： G06Q20/32

    摘要： A computer implemented system and a method for providing user related data, such as reputational information, on users of a blockchain involved in transactions is detailed. The method includes an approach for evaluating fulfilment of transactions, particularly in the context of contracts, and then providing a record of that on the blockchain through reputational information. As a result, at a late time, this reputational information can be retrieved. Similar reputational information for other transactions can be retrieved and linked to the same user, for instance based on the use of a hash of the master public key for a user. Aggregate reputational information can be computed from the pieces of reputational information retrieved.

    CRYPTOGRAPHIC METHOD AND SYSTEM FOR SECURE EXTRACTION OF DATA FROM A BLOCKCHAIN
    8.
    发明公开
    CRYPTOGRAPHIC METHOD AND SYSTEM FOR SECURE EXTRACTION OF DATA FROM A BLOCKCHAIN 审中-公开

    公开(公告)号：EP3860037A1

    公开(公告)日：2021-08-04

    申请号：EP21152780.9

    申请日：2017-02-21

    申请人： Nchain Holdings Limited

    发明人： WRIGHT, Craig Steven

    IPC分类号： H04L9/08 ,  H04L9/30 ,  H04L9/32 ,  G06Q40/00

    摘要： The invention relates generally to cryptographic techniques for secure processing, transmission and exchange of data. It also relates to peer-to-peer distributed ledgers such as (but not limited to) the Bitcoin blockchain. In particular, it relates to control solutions for identifying, protecting, extracting, transmitting and updating data in a cryptographically controlled and secure manner. It also relates to system inter-operability and the ability to communicate data between different and distinct computing systems. The invention provides a computer implemented method (and corresponding systems) comprising the steps of identifying a set of first structure public keys comprising at least one public root key associated with a first structure of interest of an entity and one or more associated public sub-keys; deriving a deterministic association between the at least one public root key and the one or more associated public sub-keys; and extracting data from a plurality of transactions (TXs) from a blockchain. The data comprises data indicative of a blockchain transaction (Tx) between the first structure and at least one further structure; and a first structure public key associated with the first structure. The first structure public key is part of a cryptographic public/private key. The method includes the step of generating an output for the first structure of interest by matching at least part of the set of first structure public keys to the extracted transaction data using the deterministic association. The one or more public sub-keys is generated or determined using Elliptic Curve Cryptography (ECC) and a deterministic key (DK) that is based on a cryptographic hash of a message (M). The one or more public sub-keys is determined based on a scalar addition of an associated public parent key and the scalar multiplication of a deterministic key (DK) and a generator (G).