System and gateway for attesting a data record

A system for locally attesting a data record at a data source, the system comprising:

• a trusted gateway locally connected to the data source and configured for receiving at least one data point from the data source;
• at least one blockchain database configured for receiving and storing data records digitally signed with a cryptographic key;
• wherein the trusted gateway comprises a secure element storing at least one private cryptographic key,
• wherein the trusted gateway is configured to create a data record containing at least one data point received from the data source, a timestamp, an identity associated with the at least one private cryptographic key and at least one digital signature generated by the secure element with the at least one private cryptographic key, and to transmit the created data record to the at least one blockchain database (7, 8),
• wherein the system further comprises a certificate store,
• wherein the certificate store contains a digital certificate comprising a public cryptographic key corresponding to the at least one private cryptographic key digitally signed by a trusted certificate authority.