Pinning in IPFS is the process of marking content as important to keep locally, preventing it from being garbage collected when storage space is needed.
How Pinning Works:
- By default, IPFS caches content temporarily
- Unpinned content may be removed during garbage collection
- Pinned content is protected from automatic deletion
- Nodes can pin content they want to keep available
Types of Pins:
- Direct pins: Pin specific objects
- Recursive pins: Pin an object and all objects it references
- Indirect pins: Objects pinned as dependencies of recursively pinned objects
Pinning Commands:
# Pin content
ipfs pin add QmHash
# List pinned content
ipfs pin ls
# Unpin content
ipfs pin rm QmHash
# Garbage collect unpinned content
ipfs repo gc
Importance:
- Content Persistence: Ensures important content remains available
- Network Resilience: More pins mean better content availability
- Storage Management: Allows selective retention of content
- Business Models: Pinning services provide guaranteed storage
Pinning Services:
- Pinata, Infura, Temporal, and others provide managed pinning
- Offer APIs for automated pinning and content management
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