This study aims to describe altcoins and provide understanding and education to the cryptocurrency market community. Data collection is secondary data that is public, namely from the publication of scientific papers, research results, writings from websites, internet sites, and news articles. This research method uses descriptive-analytic, the process of data analysis to get an overview of the data that has been collected. The findings obtained are that there are altcoins that are stablecoins and that each altcoin has a consensus mechanism, which is Proof of Work (PoW) and Proof of Stake (PoS). The finding reveal that almost all cryptocurrencies have decentralized characteristics, meaning that they are not controlled by a central government or Central Bank. This study analyzes the undervalue of altcoins, altcoins that have a low value but have a high market cap, which means that even low-value altcoins can be considered a safe investment. In Indonesia, cryptocurrency has not been recognized as a legal currency, but is recognized as an investment alternative.
