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Backing up NFT Metadata

In last-gen NFT systems, it is very common to go with whatever default the minting UI proposes with regards to metadata storage. On Opensea, for example, the default is their centralized server until you click "Freeze metadata" on your NFTs and upload it to IPFS.

Few projects do this, and many NFT owners today face the very real risk of losing their NFTs if Opensea's server goes down, or if another centralized solution their metadata resides on is somehow compromised.

There are metadata backup solutions like Aleph, but all these backup solutions again depend on a separate team maintaining a separate service and grow this whole chain of SPOFs (single points of failure).

NFTs today are extremely fragile. This is not very web3.

There is a better way: use RMRK's Multi-Resource NFT tech to back up and NFTs metadata on the NFT itself.


A resource is one "output". On a song, this will be an audio file. On an eBook, this will be a PDF. And on a monkey JPEG, this will be the monkey JPEG.

Assuming we have an NFT of a monkey JPEG, and this NFT points to If goes offline, so does our monkey pic!

But this is only one resource in an advanced system. We can also propose new resources to this NFT:

  • one resource pointing to ar://hashofmonkeyjpeg
  • one resource pointing to ipfs://ipfs/QmHashofmonkeyjpeg
  • one resource pointing to sia://hashofmonkeyjpeg

Once added to the NFT, we now have four identical sets of metadata linked on 4 different protocols: https, ipfs, Arweave, and Sia.


  1. The chances of all of them going down at the same time are astronomical, and we can consider our NFT forever safe, in a fully decentralized way.
  2. There are no single-points of failure to fail in order to make the NFT inaccessible.
  3. One of the resource hosts rugging somehow (i.e. replacing the monkey JPEG with a kitten) still leaves 3 unmutated ones, proving what the original was even if the original host goes rogue.


  1. Since only the collection issuer can issue new resources to NFTs, the software of the gatekeepers would either have to be a hot wallet, or connected to a server issuing these calls which in turn hosts the issuer wallet. We are working on a system that would allow an issuer to set additional resource proposers, solving this problem.
  2. Changing the metadata, for whatever reason, would require replacing all four resources instead of just one previously, so many more transactions needed across a large collection.