Amid the rise of cryptocurrencies, ICOs became a popular means of raising funds. During an ICO, investment in the form of cryptocurrencies (like Bitcoin or Ether) is solicited from the public in exchange for IOUs for new tokens. These tokens are typically native to the platform or service that is being funded. Until the tokens are officially released or the platform is fully functional, these IOUs function as placeholders. Participants in an ICO are essentially given an IOU, indicating a promise to deliver a certain number of tokens at a later date.
IOUs in the cryptocurrency space can be thought of as a leap of faith. Investors provide their funds upfront, betting on the potential success and significant value of these tokens in the future.
In the context of cryptocurrency, IOUs underscore the importance of trust in the digital asset landscape. Investors have to trust that the issuer of the IOU will deliver on their promise and that they will maintain a marketplace where the tokens will hold value. It's important for an investor to do the necessary research before participating in an ICO.