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 Thanks, it outputs descriptors for wpkh, sh and tr. I want to import this to Sparrow but it requires to import a file (or scan qr) so I tried to just copy/paste the descriptors into a file and import that but then I get an error that it's not valid. Any ideas what I'm doing wrong here? What is the descriptors file supposed to look like? 
 it probably imports BSMS files (https://github.com/bitcoin/bips/blob/master/bip-0129.mediawiki)

it's been a while i've used sparrow, are you really sure there isn't a way to create a watch-only wallet by specifying custom descriptors and derivation paths in the ui? 
 Counterintuitively, in Sparrow you need to create a new wallet first, before you can import an xpub 😉. Just create a new wallet and then choose "xpub / watch only wallet"