Blockchain and how it works
Blockchain technology, also known as Distributed Ledger Technology (DLT), is a decentralized, digital ledger on which information in the form of blocks can be concurrently stored, accessed, confirmed, and updated in an immutable manner while being hosted across vast networks of computer systems and is open to the public at all times. The blockchain lacks a centralized party that validates the cryptographic information it contains, but it is regarded as validated and trustworthy due to the protocol that aids in reaching a consensus on the validity of every single cryptographic entry stored on the blockchain.
When an NFT is minted on a blockchain, it carries unique metadata, unique to that singular token. This information is then stored on the blockchain on which the NFT was minted. Seeing as the information stored on a blockchain is immutable, once the NFT has been created, its record on the blockchain cannot be changed, and neither can the unique metadata it carries. This unique attribute of the blockchain unlocks a myriad of possibilities and applications.