-- **Pin by CID:** Requesting a pinning service or IPFS Node to pin a CID, without uploading the data, in this case the pinning service or IPFS node handles retrieval from provider nodes; a process that can fail if no providers are available. Once pinned, the pinning service or IPFS node will keep a copy of the data locally and typically provide the CIDs it is pinning to the network. The [Pinning API spec](https://ipfs.github.io/pinning-services-api-spec/) provides a standard way to do this with pinning services, though some pinning services have their own APIs. With Kubo, the the `ipfs pin add CID` command can be used to pin a CID.
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