It's just an address check against a given Xpub. The signer and the wallet app are just cross referencing the same address list. Basically ensuring the keys on the signer are connected to the produced address.
COLDCARD Q
-Txn comes in, Copy it as QR
-Scan the QR code with your COLDCARD Q. The device will show you the address and ask you to press 1 to verify ownership.
-If the address is verified successfully, the COLDCARD will show "Verified Address" with details about the address. If the address cannot be found, the Q will show "Unknown Address".
Very similar workflow for keystone as well.
JackTheMimic
npub1m5…2glzq
2025-05-06 16:09:33
in reply to nevent1q…ac4q
Author Public Key
npub1m50e65pv09ga73lglrkjgh5tlgj006pv9rce8xdg7rn5kps38gssh2glzqSeen on
wss://relay.damus.ioPublished at
2025-05-06 16:09:33Event JSON
{
"id": "2ed2438b7f7fe9bf10bc74a730160377372bee92cd727e00ce2bb8bc6a4273bd",
"pubkey": "dd1f9d502c7951df47e8f8ed245e8bfa24f7e82c28f19399a8f0e74b06113a21",
"created_at": 1746547773,
"kind": 1,
"tags": [
[
"e",
"b0f8e19a2593109871a08aee8ab115f6038104bc375ae06ad768c32490a0c091",
"",
"root"
],
[
"e",
"3969da95ab36a0c485ba5f025a015c0b32cc8f441bfb35e6bf848fb67f472e80"
],
[
"e",
"0dcdc599bbdad1a319963f34fab55e934f1fa187551480e6e7c6ea131d847438",
"",
"reply"
],
[
"p",
"91dbab9f62660e95258480d2f2cff6dcfdb513f28a85fa4fb55ee993a5b46809"
],
[
"p",
"17538dc2a62769d09443f18c37cbe358fab5bbf981173542aa7c5ff171ed77c4"
],
[
"p",
"dd1f9d502c7951df47e8f8ed245e8bfa24f7e82c28f19399a8f0e74b06113a21"
]
],
"content": "It's just an address check against a given Xpub. The signer and the wallet app are just cross referencing the same address list. Basically ensuring the keys on the signer are connected to the produced address.\n\nCOLDCARD Q\n-Txn comes in, Copy it as QR\n-Scan the QR code with your COLDCARD Q. The device will show you the address and ask you to press 1 to verify ownership.\n-If the address is verified successfully, the COLDCARD will show \"Verified Address\" with details about the address. If the address cannot be found, the Q will show \"Unknown Address\".\n\nVery similar workflow for keystone as well.\n\n",
"sig": "aea0a7c5a0385cbe3ae17d3dd17fe7a874e4f315cec7161a2665fe7b3406cc038318e98ec284c8b051e6c5f9629708145f850921c04734f4e0751a6a331a69c2"
}