Tamper-proof management of audit logs

A method of managing data records, said method comprising:

• maintaining a map of each of a plurality of identifiers to a corresponding coded value of a plurality of coded values, wherein each coded value is generated using a one-way function from the corresponding user identifier;
• storing in a blockchain, a data record with a first coded value corresponding to a first identifier, wherein said map is maintained external to said blockchain;
• to retrieve said data record corresponding to said first identifier:
• identifying said first coded value corresponding to said first identifier according to said map;
• accessing said data record from said blockchain using said first coded value identified using said map.

A non-transitory machine readable medium storing one or more sequences of instructions for enabling one or more digital processing systems to provide tamper proof audit logs, wherein execution of said one or more instructions by one or more processors contained in said one or more digital processing systems causes said one or more digital processing systems to perform the actions of:

• generating a plurality of records of an audit log;
• storing said plurality of records using blockchain technology,
• wherein a first set of records of said plurality of records relate to respective users having corresponding identities;
• and
• storing, in a non-volatile storage provided outside of said blockchain technology, a mapping of each identity to a corresponding value generated by a one-way-function for that identity,
• wherein said plurality of records contain only the corresponding value for each occurrence of the corresponding identity.

A non-transitory machine readable medium storing one or more sequences of instructions for enabling an authentication server to manage data records of users, wherein execution of said one or more instructions by one or more processors contained in said authentication server causes said authentication server to perform the actions of:

• maintaining a map of each of a plurality of user identifiers to a corresponding coded value of a plurality of coded values, wherein each coded value is generated using a one-way function from the corresponding user identifier;
• storing a data record corresponding to a first user in a blockchain, said data record being stored with a first coded value corresponding to the user identifier of said first user, wherein said map is maintained external to said blockchain;
• to retrieve said data record corresponding to said first user:
• identifying said first coded value corresponding to the user identifier of said first user according to said map;
• accessing said data record from said blockchain using said first coded value identified using said map.