BLOCKCHAIN TECHONOLOGIES

U današnje vrijeme kriptovalute se pojavljuju posvuda. U svijetu postoji preko 19.000 fizički prodajnih mjesta na kojima se mogu trošiti kriptovalute1. Hrvatska je također počela slijediti svjetske trendove modernizacije sustava plaćanja, te se svakog dana sve više poduzeća odlučuje implementirati ovaj sustav plaćanja u svoje poslovanje. Iza bilo koje kriptovalute nalazi se blockchain tehnologija, koja im daje sigurnost i funkcionalnost. Ona se opisuje kao baza podataka koja u sebi sadrži sve informacije o obavljenim transakcijama. S obzirom da se te informacije distribuiraju na više servera u mreži, svi sudionici imaju identične podatke zapisane kod sebe, što ovu tehnologiju čini decentraliziranom, odnosno ne može doći do prevare jer je svaka transakcija transparentna i vidljiva svakome. Osim toga, svaki blok u blockchainu je kronološki povezan sa prethodnim blokovima te je sinkroniziran sa mrežnim čvorovima, što znači da bi promjena podataka u jednom bloku značila preokret svih prethodnih blokova, a to čini prevaru i mijenjanje blokova gotovo nemogućim.Budući da blockchain može osigurati da podaci budu nepromjenjeni i transparentni, postoji ogroman potencijal za uklanjanje ne samo trećih strana, već i korupcije u različitim točkama lanca opskrbe. U radu se pobliže objašnjava blockchain tehnologija, njegova podjela, njegova svrha i njegov utjecaj na ukupan sustav plaćanja.Nowadays cryptocurrency is appearing everywhere. There are over 19,000 physical outlets in the world where cryptocurrencies can be spent. Croatia has also started with the trends of modernization of the payment system, and every day more and more companies have decided to implement this payment system in their business. Behind any cryptocurrency is blockchain technology, which provides security and functionality. It is described as a database that contains all the information about the transactions performed. Since this information is distributed to multiple servers outside the network, all participants have identical data written to them, which makes this technology decentralized, i.e. it cannot be tampered with because every transaction is transparent and visible to everyone. In addition, each block is chronologically linked with previous blocks and is synchronized with network nodes, which means that changing the data in one block would mean reversing all previous blocks, making tampering with and changing blocks almost impossible.Because blockchain can ensure that data is not tampered with and transparent, there is huge potential to remove not only third parties but also corruption at various points in the supply chain. In this paper blockchain technology is explained, as is its division, its purpose and its impact on the overall payment system