These digital certificates are stored on a blockchain.
A blockchain is a digital public database used to record transactions.
In other words, it's a permanent record that can be read by anyone, and owned by no one.
Blockchain owes its name to the way it stores transaction data—in blocks, linked together to form a chain. As the number of transactions grows, so does the blockchain.
We agree with DC investor, a seasoned NFT collector and DeFi (decentralized finance) supporter, when he says that the value of the blockchain isn’t that it’s a global cloud computer, but rather that it is a shared source of truth which everyone can agree on, while remaining censorship-resistant and tamper-free with no one “controlling” it.