Volume 2 - Issue 2, March - April 2026

Blockchain and cryptocurrencies are these big new things that change how we do digital stuff. They make systems that are spread out, easy to see through, and pretty safe without anyone in the middle controlling it all. I mean, blockchain is basically like a shared record book that keeps track of every deal or transaction forever, using some kind of code tricks and ways for everyone to agree on what’s real. It gets rid of needing banks or companies to oversee everything. One main way people use it is with cryptocurrencies, you know, like digital money that lets you send cash directly to someone else. That makes things faster, safer, and you can trust it more, at least that’s what it seems like. But it’s not just about money. Blockchain pops up in all sorts of places, like with smart devices in the Internet of Things, or in hospitals for health records, finance stuff, tracking supplies in chains, cloud services, even how governments run things. It’s kind of everywhere now. Still, there are problems with it. For one, it doesn’t scale up well when too many people try to use it at once. Plus, it uses a ton of energy, which is not great for the planet. And getting different blockchains to work together is tricky, plus rules from governments are all over the place, not clear yet. Security is another worry, like attacks on the agreement process, bugs in those smart contracts, or losing control of your keys. This paper looks at the basics of blockchain, how the crypto side works under the hood with math and codes, the algorithms that make consensus happen, and some real examples out there. It also goes into the threats and ways to fight them back. Current trends in research are pushing to make it better, faster, more secure, so more people adopt it. I think with more tech improvements and solid ways to handle security, blockchain could really shake up how we build digital systems in industries like these. But it’s not all figured out yet, some parts feel messy.

Dr.M.Kayalvizhi, U.Abhinaya,"An Analytical Study of Blockchain Technology" International Journal of Advanced Multidisciplinary Research and Educational Development, V2(2): Page(687-694) Mar-Apr 2026. ISSN: 3107-6513. www.ijamred.com. Published by Scientific and Academic Research Publishing.