*4.2.2 Log inmutables*

Applications require robust and inviolable registration systems, for example electronic voting or bank information systems. At Scytl, we use technologies called immutable records, which are implemented in electronic voting solutions. This technology ensures the integrity, authenticity, and nonrepudiation of the generated records; therefore, in case of any event, the auditors can use them to investigate the problem. To improve the integrity of the information, an implementation for immutability is required, the integrity tests of the secure registers within the chain of blocks known as Bitcoins that is based on SHA-1 [43].
