**6. Conclusions**

As we have read, blockchain is much more than just cryptocurrencies. It is possible to build a vast number of use cases by using blockchain as a trusted infrastructure due to its security properties. In this document, we have shown several of these use cases, all of them security-related may be unknown for the reader and different from the now-trendy cryptocurrencies trading.

As far as we dig into the blockchain technology, we become more aware of its possibilities, ranging a huge spectrum of functionalities and covering various use cases in different fields, such as industry, health, finances… although this document has enlightened only the ones concerning the security field.

However, the future is continuously changing, and blockchain technologies are not the panacea for every problem in the world. The emergence of the so-called blockless technologies is a challenge for the blockchain technology itself, because they present a different way to achieve almost the same security requirements of the blockchain technologies, but trying to overcome its issues, such as latency and fees. The subsequent years will decide which ones of these technologies take advantage of the rest of them, but the decision does not seem to be easy.
