For Bitcoin on Game Boy Color, there's Off-wallet by elRaulito. Very new, but could also be a highly secure method if proven/refined.
There's also signgb.app which doesn't support Bitcoin, but a few other coins. That one's been in development a bit longer.
And now there's also a work in progress for the PlayStation called PSXX by 0xVSultan, that adds nostr event signing and stuff, but that one's so complex it will take even longer to prove if it's secure.
🇵🇸 whoever loves Digit
npub1wa…6u3l2
2026-10-28 16:22:45 UTC
in reply to nevent1q…aypd
Author Public Key
npub1wamvxt2tr50ghu4fdw47ksadnt0p277nv0vfhplmv0n0z3243zyq26u3l2Published at
2026-10-28 16:22:45 UTCEvent JSON
{
"id": "41ce93d52e95182ba8388557f4ba7ed650a8b7a66e1f7220317de0ce6b3699ae",
"pubkey": "7776c32d4b1d1e8bf2a96babeb43ad9ade157bd363d89b87fb63e6f145558888",
"created_at": 1793204565,
"kind": 1,
"tags": [
[
"e",
"38772bb88310389157dad63095cc54b1f253dc8edd93150800c06fd3e43b39c5",
"wss://nos.lol/",
"root",
"b133bfc57bed61c391d4e8f953b906c7f1709c438d91c75fb6daf79449d5789d"
],
[
"e",
"4c239c1752582bb2c4e2e2d50a60cb9749ffee5c4e74ab6019dda16e80e5fbf1",
"wss://nos.lol/",
"reply",
"b133bfc57bed61c391d4e8f953b906c7f1709c438d91c75fb6daf79449d5789d"
],
[
"p",
"5ac74532e23b7573f8f6f3248fe5174c0b7230aec0b653c0ec8f11d540209fd7"
],
[
"p",
"b133bfc57bed61c391d4e8f953b906c7f1709c438d91c75fb6daf79449d5789d"
],
[
"client",
"jumble"
]
],
"content": "For Bitcoin on Game Boy Color, there's Off-wallet by elRaulito. Very new, but could also be a highly secure method if proven/refined.\n\nThere's also signgb.app which doesn't support Bitcoin, but a few other coins. That one's been in development a bit longer.\n\nAnd now there's also a work in progress for the PlayStation called PSXX by 0xVSultan, that adds nostr event signing and stuff, but that one's so complex it will take even longer to prove if it's secure.",
"sig": "306aa57ba91fec4d345b8aca037bc90bf3b1458543f3d831b44d86498af002b62eca9c8ed505eaec57f8286bbb5265abb96f1df0791faacda1a618fb24e4001f"
}