1/ @COLDCARDwallet is the first PSBT based wallet, and the first air-gapped wallet, to gain our official support. We’ve gone through pains to make the PSBT process as secure as possible. There are two ways you can structure a PSBT to sign via the Coldcard unchained-capital.com/blog/now-coldc…
2/ The quickest implementation requires you to include your wallet Xpubs in each and every PSBT file. However, after discussing this option with the @Coinkite team, we concluded this unnecessarily compromises privacy. Our implementation is privacy preserving
3/ First, you configure your Coldcard with the Xpubs associated with your Vault or Loan, so that your future PSBTs don’t need to include this sensitive information 
4/ The result is a one time setup of your Coldcard when you create your vault/loan, so it will always recognize the transaction it is being asked to sign. Unlike with other PSBT implementations, you’ll never pass extraneous wallet information in your PSBTs.
Try out multisig with an Unchained Vault today. You can pair a @COLDCARDwallet with a @Trezor or @Ledger in a multisignature quorum. unchained-capital.com/vaults/
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