Having a seed in a Coldcard Q, I derived —using a BIP85 index— a deterministic 32-byte-hex. That's a private key for Nostr.
I asked Q to show it as a QR, and then I scanned it with a Nostr client. Thats it.
If I lose my phone or logout from client, I can always derive it again using the same seed and index with a CC Q 🙂
lunaticoin
npub1yn…3mzt0
2024-08-30 12:09:39 UTC
in reply to nevent1q…2grs
Author Public Key
npub1yn3hc8jmpj963h0zw49ullrrkkefn7qxf78mj29u7v2mn3yktuasx3mzt0Published at
2024-08-30 12:09:39 UTCEvent JSON
{
"id": "69a3f8d692a6afbca033f8f06cda2c8d3cbac981580a7b7749836ebb5a1e4478",
"pubkey": "24e37c1e5b0c8ba8dde2754bcffc63b5b299f8064f8fb928bcf315b9c4965f3b",
"created_at": 1725019779,
"kind": 1,
"tags": [
[
"e",
"b588144c2d373de4e20e00a3a43eda8191bb07d12fe1eeef4eb751a02b9cd575",
"",
"root"
],
[
"e",
"1d4534d07f0e7779c191ab0acd132b226ca7cb367a8f57d456eb1a3b0b1b1938"
],
[
"e",
"66b4d1f8e3646f90ef04526a7d13c3bd2d929a2938bbc7258cc12eef338abf42",
"",
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],
[
"p",
"e88a691e98d9987c964521dff60025f60700378a4879180dcbbb4a5027850411"
],
[
"p",
"24e37c1e5b0c8ba8dde2754bcffc63b5b299f8064f8fb928bcf315b9c4965f3b"
],
[
"p",
"9baf1f77f8441ad3f2d0c5b05cdb9c97b0e4f145477e62f4b158a586072c089f"
]
],
"content": "Having a seed in a Coldcard Q, I derived —using a BIP85 index— a deterministic 32-byte-hex. That's a private key for Nostr. \n\nI asked Q to show it as a QR, and then I scanned it with a Nostr client. Thats it. \n\nIf I lose my phone or logout from client, I can always derive it again using the same seed and index with a CC Q 🙂",
"sig": "9d381f9c92011979a673d661c45f33359e04bbeb38e7729758dee0820385ed4dce592593a8a9e900afb6896ff235bccd154a2fa76ed578b3d1c25e14fcffabe3"
}