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NFTs are often described as digital content that exists entirely on the blockchain. However, most NFTs are better defined as links <\/strong>that exist on the blockchain. Storing files on-chain is possible, but it isn\u2019t common. In this article, we\u2019ll look at on-chain NFTs, off-chain NFTs, and the benefits and downfalls of each method.<\/p>\n In most cases, NFTs contain a link pointing to a file stored on the Interplanetary File System (IPFS). Services like Pinata offer IPFS protocols used to store and share files. To be clear, IPFS is a web2 solution, however, many of these services are closely tied to Web3 because of how they are utilized. Pinata refers to itself as \u201cThe Web3 Media Platform\u201d because it knows most of its users rely on it for NFT file storage.<\/p>\n NFT marketplaces and galleries use the NFT\u2019s metadata (the link pointing to the IPFS file) to decide what to display when you look at the NFT. For example, if \u201ctokenID 12345\u201d links to a picture of a taco, the app will display the picture of a taco; if it links to an image of a cat, the app will display the cat picture.<\/p>\n Some projects, such as CryptoPunks<\/a>, store their files on-chain. In this case, the digital file is stored on mainnet, and the file itself is a core part of the NFT\u2019s metadata. According to Larva Labs, \u201c[on-chain storage serves to] cement the long-term survival of the CryptoPunks images and attributes, and ensure that they can be fully accessed by anyone with only an Ethereum client.\u201d<\/p>\n On-chain NFT storage is incredibly cost-prohibitive; when Larva Labs stored their CryptoPunks on-chain, they spent over 73M gas. A recent study found that it costs around $20K to Store 500KB of data on the Ethereum blockchain. The exorbitant costs are the primary reason most projects opt for off-chain storage. Still, off-chain storage isn\u2019t entirely secure.<\/p>\n Files can be pinned to NFTs in various ways, including a URL or CID. URL pinning isn\u2019t ideal, as the URL\u2019s contents can change over time. A URL pointing to a taco image could later point to a cat picture, even if somebody spent 1 ETH for the taco NFT. In this case, their taco NFT would now be a cat NFT, and they couldn\u2019t do anything about it.<\/p>\n CID pinning is more secure, as the CID would change if the content changes. If someone were to change the picture of a taco to a picture of a cat, the associated NFT would still point to the taco since the CID was generated based on the image itself. However, this doesn\u2019t mean CID pinning is entirely secure. If the IPFS servers were to shut down, the NFT image would disappear. This unfortunate circumstance was experienced firsthand by those who purchased Coachella\u2019s lifetime pass<\/a> NFTs from FTX before its collapse.<\/p>\n On-chain NFT files would only disappear if the blockchain disappeared, making it a more secure method of storing NFT files. Still, this method is unlikely to be used frequently unless blockchain storage costs are reduced.<\/p>\n Want more? Connect with NFT Plazas<\/b><\/p>\n Join the Weekly Newsletter *All investment\/financial opinions expressed by NFT Plazas are from the personal research and experience of our site moderators and are intended as educational material only. Individuals are required to fully research any product prior to making any kind of investment.<\/em><\/small><\/p>\n NFT Artist. Musician. Founder of Crescendo.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\nHow do NFTs work?<\/strong><\/h4>\n
Off-chain NFTs<\/strong><\/h5>\n
On-chain NFTs<\/strong><\/h5>\n
On-chain vs. off-chain storage<\/strong><\/h4>\n
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