See why nobody changes the past on a blockchain, and what BTC, ETH and the digital dollar are for.
In a central ledger, whoever runs it can edit it. On a blockchain, try to change an old block.
In a central ledger, anyone with access can change the numbers. Tap edit.
Each block keeps a fingerprint of the one before. Change an old value and watch the copies.
Bitcoin: digital money with a fixed supply. Ethereum: the network for apps, and ETH pays the fee for every action.
USDC and USDT aim to be worth US$ 1. For each token, the issuer says it holds US$ 1 in reserves.
The other side: You depend on the issuer. In rare cases, it can freeze tokens.
Up next: Tokenized stocks