Subnostr

Yes.

When it gets to post mix, I can send it to cold Storage?

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Yes, you can send utxo in Postmix wherever you need.

There's also option called "Mix to Settings" where you can mix directly to your cold storage

Check this out

3 mixes was the preset amount. I was thinking of bumping that to 5 or 6. There a benefit to that?

I changed mine to 5.