Token burn

Burning a token is the inverse of minting it. In an NFT, the burn function erases the tokenId from the ownership record: the token ceases to exist and can no longer be transferred, and it is used in redemption mechanics (burning an NFT to receive another item or a physical good) and in upgrades. In fungible tokens it reduces total supply and serves deflationary mechanisms. The key is verifiability: anyone can check on-chain that supply dropped or that the token went to a burn address, something transparent and auditable that deleting a record in a private database cannot offer.

It allows supply to be reduced credibly, assets to be redeemed (loyalty, tickets, or a real-world asset delivered when its token is burned) and spent items to be removed in games. It is a central piece of tokenomics and of loyalty-program integrity. It is worth distinguishing the EIP-1559 protocol burn, which burns part of every Ethereum transaction fee since the London hard fork (5 August 2021), from an application's contract-level burn.

OpenZeppelin's burnable extensions define the operation as a standard for both NFTs and fungible tokens. In the real market it appears in fashion and collectible drops that let you redeem an NFT for a physical product, in the burning of consumable items in gaming and, at network scale, in EIP-1559 itself as a protocol burn.