Any time you require 1) a distributed database 2) in the face of adversarial participants, which truthfully, is less common than the blockchain obsessives would think.
A centralized organization (.com or .gov) that can achieve consensus amongst participants can do just fine with Postgres and a REST API.
Adversarial participants are common, but typically that's solved with a third-party overseer that administers the system. Finding use cases that demand decentralization are harder.
Bitcoin was created to remove central banks/govts from the money creation process, but in most cases, if you don't trust the central authority, you just don't participate. With cash, you can't easily get around dealing with the govt.
When cash was gold and/or silver the central authority might do some minting of coin but you did not need to trust them with a ledger or not to print huge amounts of paper currency. Gold and silver were currency for thousands of years. Soon all the people who lived under that system will be dead. It will be interesting what the system of global fiat will bring in the future.
A centralized organization (.com or .gov) that can achieve consensus amongst participants can do just fine with Postgres and a REST API.
Adversarial participants are common, but typically that's solved with a third-party overseer that administers the system. Finding use cases that demand decentralization are harder.
Bitcoin was created to remove central banks/govts from the money creation process, but in most cases, if you don't trust the central authority, you just don't participate. With cash, you can't easily get around dealing with the govt.