in the whitepaper the author said : “Deduplication: all objects that hold the exact same
content are equal, and only stored once.” is that mean that data is stored once ? and nodes cant store the some objects ?
I think this thread should answer the question: How to understand "IPFS removes duplications across the network"
TL;DR: No, it doesn’t mean that data is only stored once in the network. It means that if a file or a block are added multiple times or referenced from multiple places, it’s only stored once per node. In practice there are some edge cases where that’s not true, but for standard use cases it should be.
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