Crypto Gloss

IPFS

IPFS (InterPlanetary File System) is a peer-to-peer protocol and set of tools for addressing and exchanging content across a network of nodes. Rather than identifying a file only by the server location where it lives, IPFS uses a Content Identifier (CID) that points to a particular representation of content. IPFS helps people retrieve data from available peers or gateways, but a CID alone is not a promise that someone will keep hosting the data.

Content Addressing and CIDs

When content is added to IPFS, it is represented as blocks in a directed acyclic graph, or DAG. A CID identifies that encoded structure using information such as a content hash, codec, and CID version. If the addressed blocks are retrieved and their hashes match, the data can be checked against the CID. That makes content addressing useful for detecting unexpected changes.

A common oversimplification is that identical files always produce one identical CID. IPFS documentation explains that two identical files can have different CIDs because chunking, DAG layout, codecs, and CID settings can differ. Conversely, the same CID refers to the same addressed content; it does not guarantee that the content is available, that an application will interpret it correctly, or that a website’s surrounding metadata cannot change.

Availability, Pinning, and Filecoin

IPFS nodes can cache data they retrieve, but local storage is limited and nodes may garbage-collect unpinned data. Pinning tells a particular node to retain selected content. A pin on one machine or one provider is not a universal permanence guarantee: availability still depends on that operator keeping the data and serving it. Important content should have a deliberate retention plan, such as multiple independent pins and periodic retrieval checks.

Filecoin is a separate decentralized storage network that can be used alongside IPFS. Filecoin storage deals specify terms for storing data with providers; an IPFS CID does not automatically create such a deal or ensure retrieval forever. The protocols address related but different parts of a storage workflow.

IPFS and NFTs

An NFT’s metadata can contain an IPFS URI that points to an image or other asset. The pointer may make a particular content representation verifiable, but it does not itself pay for ongoing storage or guarantee that gateways and providers remain online. A collection’s contract and metadata design also determine whether pointers can be changed. NFT buyers should distinguish on-chain token ownership from the availability and rights attached to linked media.

Common Misconceptions

“IPFS permanently stores anything once it has a CID.” A CID identifies content; persistence requires one or more nodes to retain and serve it.

“Every identical file always has the same CID.” The same bytes can be encoded into different IPFS structures, producing different CIDs.

“Filecoin is the same thing as IPFS.” IPFS addresses and exchanges content; Filecoin is a separate storage network with its own provider agreements and incentives.

Social Media Sentiment

An April 2024 r/ipfs discussion asked whether content on IPFS is immutable when users may need to pay a pinning provider to keep it available. Replies drew a useful distinction between content integrity and persistence: a CID can verify what is retrieved, while availability depends on nodes retaining the data. This small technical discussion reflects recurring user questions, not a representative survey.

Read the r/ipfs discussion about IPFS immutability and pinning.

Last updated: 2026-10

Related Terms

See Also

Sources