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That's a good idea. I don't know the internals of IPFS, but the related https://libp2p.io/ looks promising. Follow up https://github.com/holtwick/briefing/issues/52

I did a POC of this over a year ago [0]. Now, with better libp2p-js library, it is surely much easier/better nowadays.

If you can figure out how to share that hash, you may as well just share the offer.

Yes, serialization is the issue. URL length is technically unlimited but in practice very long urls don't work out so well