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Yes it is! But you need to create a new keyset to do this
You can create a keyset from an existing nsec or a new one. A keyset is a set of FROSTR "shares" (basically like keys in a multisig) and you need a threshold of these shares to sign a valid note (you choose the threshold)
These shares in the set are inherently interconnected so if you have a 2/3 and you want to make it a 3/5 you need to DESTROY the old 2/3 keyset (or at least the threshold of shares in that keysey) and then CREATE a new 3/5 keyset (with the same nsec)
Demo is here: https://x.com/bitcoinplebdev/status/1905056787771842665
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TLDR;
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This is dark!! lol
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is it easy to add additional keys later on?
I think so but @bitcoinplebdev and @cmd can give you a better answer
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I still have to dig deeper into how this works, but my question is - is it easy to add additional keys later on?
I like how Trezor does this - you start with a single key and then later you can use the same key to expand into multi-share.
https://trezor.io/learn/a/multi-share-backup-on-trezor