keychat
Keychat

https://www.keychat.io/

Keychat is a chat app, built on Bitcoin ecash, Nostr protocol and Signal/MLS protocol. Keychat is inspired by the postal system — stamps, post offices, letters. Keychat uses Bitcoin ecash as stamps and Nostr relays as post offices. Keychat uses Signal/MLS protocol to ensure message encryption security and meta-data privacy. https://www.keychat.io/

Public Key

npub1h0uj825jgcr9lzxyp37ehasuenq070707pj63je07n8mkcsg3u0qnsrwx8

NIP-57 Address

opposedmouse41@walletofsatoshi.com

Profile Code

nprofile1qqsth7fr42fyvpjl3rzqclvm7cwves8l8l8lqedgevhlfnamvgyg78spz3mhxue69uhhyetvv9ujuerpd46hxtnfduq3qamnwvaz7tmwdaehgu3wwa5kueg5uedgv

Publishing to

relay.damus.io

nostr.wine

eden.nostr.land

Author Public Key

npub1h0uj825jgcr9lzxyp37ehasuenq070707pj63je07n8mkcsg3u0qnsrwx8

Show more details

Last Notes

2025-05-21 02:13:58

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“ Normally a group will originally belong to one specific relay, but the community may choose to move the group to other relays or even fork the group so it exists in different forms -- still using the same id -- across different relays.”
It seems that NIP-29 was designed specifically to support only a single relay.

2025-05-20 00:02:06

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Thanks for the feedback. We still need to consider the other risks this approach might bring.

2025-05-19 01:08:00

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We want service providers to be able to earn sats.
There’s no such thing as a truly free service in the long run.
#nevent1q…wx89

2025-05-19 00:39:12

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#nevent1q…54as

2025-05-11 08:18:53

Keychat attaches a 1 sat stamp to every message. But it doesn’t contact the Ecash mint server for each one. Instead, it fetches a batch of 1-sat ecash tokens in advance and uses them as needed to stamp messages.

2025-05-10 08:07:02

Keychat + Kinostr
https://video.nostr.build/a5200d669f62abdf13ec990e62fb15c905a691552dc9075745657e996875eff2.mp4

2025-05-10 00:06:23

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I tested the invoice popup — it works. I’m hoping there can be an “Open in a Bitcoin wallet” button below the invoice, so it can directly trigger the Keychat wallet for payment without needing to copy and paste the invoice manually.
https://image.nostr.build/7937519b367fd4d8d3d373b5c35229815beb17096e829eb9b76ba984cb5574b0.jpg
https://image.nostr.build/3975d3805ddf7a1073cf0c4b510c32f0bba42951f85f8213daef4e782c239396.jpg

2025-05-09 03:53:58

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Using open-source WebRTC to implement voice and video calls is now a mature solution—both Signal and Telegram use it.
Keychat will add voice and video calling. We’ve already run some initial tests—it works, but it still needs further refinement.
https://image.nostr.build/b131403ab2e21bee56f0572f3b0f1f3a5447f92198b4279a19f242115d72811b.jpg

2025-05-09 02:49:39

Maybe we could use NIP-17, which is used to encrypt DMs, to encrypt feed notes as well.
Suppose you have 10 friends — when you post a note, it’s essentially like sending 10 identical DMs.
However, the note still appears in the feed. Only your friends can decrypt and read it; others can’t see the content.
#nevent1q…gq76

2025-05-08 08:56:34

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The version that only supported seed phrases was released about 10 months ago. We received a lot of feedback requesting nsec support, so around 8 ？months ago, we added nsec support.

2025-05-08 08:18:55

We’re not quite sure why so few Nostr clients choose to use seed phrases.
#nevent1q…gm7g

2025-05-08 06:02:15

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I misunderstood you. The current version does support nsec, but we still think seed phrases are better.

2025-05-08 05:15:42

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A Nostr key is essentially a Bitcoin key — the only difference is the format.

2025-05-08 05:13:48

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Others don’t know that the two public keys belong to the same seed phrase.

2025-05-08 01:37:38

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note1qf9m2l9vhm2cp4wmzvjcjkgtppc3lgsvmhgytaqz3lk97l428y3sr07np8

2025-05-07 10:20:00

The Keychat customer discussion group is a NIP-29 Relay-based Group.
We use Chachi by @npub107j…ncxg , a NIP-29 web client, to join the group in the Keychat browser. A new NIP-29 web client, Flotilla by @npub1jlr…ynqn , has also been released — you can try it out directly in the Keychat browser by clicking its link.
The Keychat customer discussion group runs on the 0xChat relay by @npub10td…x2wl . That’s Nostr’s collaborative magic at work.
Welcome to join:
https://chachi.chat/groups.0xchat.com/2gVadOYXRyzc2ne6
https://video.nostr.build/f07199f8c1244e824e50795acb4edab1155833b8a40ccba16c100c8efb9c9a85.mp4

2025-05-06 13:45:23

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We’d like to see a chat bot where users pay 1 dollar in stablecoins and receive around 1000 ecash sats in return.

2025-05-06 13:27:05

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🤔
We think Keychat is also a Nostr client that encrypts messages using the Double Ratchet algorithm.

2025-05-06 01:43:30

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#nevent1q…54as

2025-05-06 01:42:59

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#nevent1q…f7z4

2025-05-06 01:41:57

In Keychat, services can be offered in two ways: through chat bots or Mini Apps.
Both are open for anyone to provide.
Chat bots are ideal for simpler, single-purpose tasks — like AI bots. Mini Apps, on the other hand, are designed for more versatile and feature-rich services.
Users pay sats to chat bots and Mini Apps through their Keychat Wallet. The operators of these services receive the sats directly.

2025-05-05 09:15:48

https://following.space/ by @npub12rv…85vg is a Mini App for Keychat. You can log into it seamlessly through the Keychat browser like this 👇
https://video.nostr.build/73eb9d935541726a70ffd6216ef142a09811f74c182c4adbc7b5f1b1fe30aae7.mp4

2025-05-04 08:49:39

In Keychat, everything starts with a 12-word seed phrase.
The seed phrase derives multiple IDs, which can serve as both chat IDs and browser IDs.
It also derives the private key used to recover the wallet.
Both chatting and using mini apps in the browser rely on the ID and wallet.

2025-05-02 11:07:07

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cc@npub1syj…f6wl

2025-05-01 16:22:21

How can we provide a secure login method for Nostr web clients?
The typical approach is to develop an ID extension — the browser plays the central role, and the ID is just an extension.
Keychat takes the opposite approach: the ID is the core, and the browser is simply an extension.

2025-04-27 09:03:16

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Yes.

2025-04-27 08:43:21

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Tap the button in the top right corner of the MLS group chat to view the group details, where you can see the relays being used. Keychat automatically uses all of the user’s relays as the group relays by default. If a new member isn’t connected to the commonly used relays, they may not receive messages from other group members.
Maybe we should consider including the group’s relays in the welcome message, so that new members can decide whether to add them.

2025-04-27 05:50:35

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You can enter a URL in the search box.

2025-04-26 13:06:14

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Ecash sats work better for very small payments. With Phoenix Wallet charging 0.4% plus 4 sats per transfer, sending less than 100 sats isn’t practical.

2025-04-26 11:26:09

Keychat is the super app for Bitcoiners.
Autonomous IDs, Bitcoin ecash wallet, secure chat, and rich mini apps — all in Keychat.
Autonomy. Security. Richness.

2025-04-26 09:27:54

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I get your idea now. I think it could work if the commenter pays. First, the fee would be very small, maybe less than 1 sat. Second, expressing oneself is satisfying. Plus, great comments are likely to get zapped.

2025-04-26 09:06:16

We spend time every day helping people understand Keychat. Feel free to @Keychat anytime you have questions.
#nevent1q…v4kz

2025-04-26 09:04:00

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Explaining Keychat is as important as building it.

2025-04-26 08:46:56

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#nevent1q…y7yt

2025-04-26 08:18:41

We hope that Nostr relays can evolve into post offices that sustain themselves by collecting ecash sats stamps.
#nevent1q…8c25

2025-04-25 11:48:30

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Keychat currently uses Google’s Firebase Cloud Messaging (FCM) service for message notifications. If you turn off notifications, this service will no longer be used.

2025-04-25 11:20:35

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Centralized chat apps often enhance discovery by accessing users’ phone contacts — something Keychat doesn’t and can’t do by design. Instead, discovery on Keychat works more organically: when someone starts using it, they tend to invite friends who are also into BTC or Nostr. Keychat is primarily designed as a private messaging app for friends, rather than a platform for connecting with strangers. That said, it can still be used that way — for example, users can include their Keychat ID in their Nostr profile to make themselves discoverable.
Regarding the sentence “I understand that each persona has a different key pair, but feels a missed opportunity,” I’m not entirely sure what you mean — could you clarify?

2025-04-25 08:54:40

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The current avatar is derived from the public key, so there’s no need to upload anything to a server. We’re considering adding support for custom avatars—allowing users to upload their own to a server or relay—but we have some reservations and are still exploring better alternatives.

2025-04-25 08:47:26

If you already have a Lightning wallet, minting ecash sats on Keychat Wallet is really easy.👇
https://video.nostr.build/c99eb83f3ab2220a2546353ee1ade97983f00c937e62030b2fd5d2d4ae6ab153.mp4

2025-04-25 08:30:08

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Thanks

2025-04-25 07:39:53

To explore the design inspiration and design philosophy behind Keychat, feel free to read the short content below.
https://www.keychat.io/about.html

2025-04-24 23:30:29

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You can use your existing npub or generate a new one.

2025-04-24 15:40:31

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Click this link and copy the npub from the profile.
https://image.nostr.build/d064c089741f1db171a73733ee941f5f03d4b6e0d79a4d6d5a8309b6104e6547.jpg

2025-04-24 15:00:47

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Ask them to download Keychat and send them some sats — that way, you can bring them into the world of Bitcoin and Nostr.

2025-04-24 14:58:58

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“@npub17a6…7x39”
Add this public key 👆

2025-04-24 11:32:10

We recommend you try the web app in the Keychat browser.
While using these web apps, if you come across an "Extension Login" option, you can log in with your Keychat ID by clicking it.
Similarly, when you encounter a Lightning Network invoice and an "Open Wallet" button, clicking it will allow you to pay using your Keychat Wallet.
https://image.nostr.build/dd09969b61dea856d04bb669ae495d1e11ef6120bece0324b521dbdbb3602fa8.jpg
#note1yyz…l7qp

2025-04-24 10:45:26

Great news — Keychat is now live on the Apple App Store! We’re still waiting for Google Play approval.
iPhone users can download it here:
https://www.keychat.io/
If you need some ecash sats to try out Keychat’s unique sats stamp feature, you can add this Keychat ID as a friend.👇
@npub17a6…7x39
By quoting this note, you’ll also get zapped with sats.

2025-04-23 15:19:07

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Yes. iOS, macOS, and Android all natively support WebView.

2025-04-23 03:48:37

Keychat group chats are private and can only be joined through friend invitations. You can’t invite others to join the group by sharing a Group ID.
If you want to create a public group chat, you can use Chachi in the Keychat browser. Chachi is a web client for public Nostr group chats.
Here’s a public group we’ve created: https://chachi.chat/groups.0xchat.com/2gVadOYXRyzc2ne6.
If you see this note in Jumble on Keychat browser, just click the link to join the group. 👇
#note1dwn…p8ad

2025-04-23 03:38:56

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Keychat group chats are private and can only be joined through friend invitations. If you want to create a public group chat, you can use Chachi in the Keychat browser. Chachi is a web client for public Nostr group chats. Here’s a public group we’ve created: https://chachi.chat/groups.0xchat.com/2gVadOYXRyzc2ne6. If you see this note in Jumble on Keychat, just click the link to join the group.

2025-04-23 02:37:47

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We feel that saying “100 sats” is sufficient — no other symbol is needed.

2025-04-22 07:41:24

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We feel that the term “Sats” became popular mainly because the price of BTC rose to around $100,000, making 1 sat equal to 0.1 cent — an amount that’s easy to recognize and remember. As owning a whole Bitcoin becomes increasingly difficult, it also drives the adoption of smaller units like sats. The symbol for sats should still be the BTC symbol. Sats also make it easier to measure micropayments made in Bitcoin.

2025-04-21 16:11:14

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Apple reached out once in the first week. We’ve heard nothing from Google Play so far. We emailed them today and are waiting to hear back.

2025-04-21 15:52:46

It’s been two weeks since we submitted Keychat to the Apple Store and Google Play. Still under review. Maybe Keychat is just a little too avant-garde. 😂

2025-04-17 15:09:28

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#nevent1q…m0s0

2025-04-16 12:54:49

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We can release a standalone APK outside of Google Play later on, with support for older Android versions.

2025-04-15 15:12:53

Offline Me needs self-controlled IDs and wallets to live in the physical world.
Online Me also first needs self-controlled IDs and wallets to live in the digital world.
Then Me can chat and browse.
In Chat, Me uses the IDs and pays for relays per message with the wallets.
In Browser, Me uses the IDs to log in to mini apps and pays in Bitcoin with the wallets.
https://image.nostr.build/d7a3ffb5cd74f70a8aee87a144ccab94eba332fb27eeac1fcc7388b8469f8c93.png
https://image.nostr.build/46370c7c3ff09725718c2340f65a1dbc6c67ca94c309367530dac15e3276bd18.png
https://image.nostr.build/0439136cec0b8ab549824c6c9a7733a1a3eb417900eea273527e15bb0c51bbe3.png
https://image.nostr.build/cba150fd5ae1f8c5cdbf22c7f6e47b61476434a2ef078d12e9943e635dcb73a4.png

2025-04-15 14:34:43

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Yeah.

2025-04-15 14:26:01

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We're currently using WebView, which is the web engine built into the operating system.

2025-04-15 14:16:46

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Got it.

2025-04-15 14:15:45

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We are waiting for the App Store. 😭

2025-04-15 13:33:53

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Signal: Ratchet advances inline with message sending — no extra messages needed.
MLS: Requires extra protocol messages (Update proposals and Commits) to advance the key state and ensure post-compromise security.

2025-04-15 13:23:03

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No, the user and the AI bot are in a one-on-one chat using Signal encryption. We believe the Signal protocol is the most efficient for one-on-one and small group chats, while MLS is better suited for large group chats.

2025-04-15 13:20:33

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We still need to learn more about NWC. Highly recommend you try out Keychat’s current Cashu sats.

2025-04-15 13:15:29

Keychat encourages users to use multiple IDs (derived from the same seed phrase).
As shown below, one ID is “Satoshi” for chatting with friends, and another is “Bot” for talking to the AI bot.
https://image.nostr.build/0b5764aade610db36f9005c29b3bd35bedf341d0e9797a1a8904c89ba3c2edf2.jpg

2025-04-15 13:07:14

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Amber. It supports NIP-55.
https://github.com/nostr-protocol/nips/blob/master/55.md

2025-04-15 12:59:48

Keychat users can ask the AI bot questions and pay per message with ecash Cashu sats. This is different from the sat stamp paid to the relay — it’s paid to the bot.
https://image.nostr.build/960fe662ec03ee93f160747038ca597b903bad5adce78d9b6c6e1c296f7baa29.png

2025-04-15 12:48:33

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In case you missed it, Keychat users can ask the AI bot questions and pay per message with ecash Cashu sats, as shown in Screenshot 2. This is different from the sat stamp paid to the relay.

2025-04-15 12:38:45

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We believe Jumble is the best Nostr microblogging web client.

2025-04-15 12:33:33

Using Jumble on Keychat for macOS
https://image.nostr.build/2888e6a23cab4fa4a638707931ebcc7ad63644d2199dd63fe660008e29c76711.png

2025-04-15 12:15:01

We submitted Keychat to the App Store and Google Play last Monday, and it’s currently under review. In the meantime, the Android APK and macOS version are available for download at: https://www.keychat.io/
If you’re an existing Android user, please note that the new version of MLS groups is not compatible with the previous one. After upgrading, you will no longer have access to your old MLS groups.
https://image.nostr.build/59020504bff8673d5d845b8c9fcab09c10e50f48d31409187a67076a07fda909.jpg
https://image.nostr.build/b55cfa5dbc1b13c5c7c04652947705845e5b04cdd024e10ebf941a8551be5128.jpg
https://image.nostr.build/75f84d6a67870c808c2f9ccc570a3fdd346669d38542b36d3bec9f2486c8f157.jpg
https://image.nostr.build/a7c85014f5043a39b6ef328bb02387059e49dd32b07e9a026499690dade87e34.jpg
https://image.nostr.build/8bb32593fcc7319d6bef1cb6fbaf1534e5d9f6f62a72d90e942f687945af39d1.jpg

2025-04-10 02:01:19

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Keychat and NIP-104 are both based on OpenMLS, so they are 95% similar. The mechanism we currently use to update the receiving address is different from NIP-104. We hope to work together to come up with an optimal NIP. Ultimately, different MLS clients should be interoperable.

2025-04-03 04:13:00

ID+Wallet, Chat+Browser
#note13sx…nk7y

2025-04-02 10:42:53

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Keychat doesn’t support WebLN yet.
The web client generates an invoice, which is a string starting with “lnbc”. When the user clicks to pay, the browser navigates to a URL containing the invoice. Keychat detects this redirect and then displays the payment window.

2025-04-02 10:30:19

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In Keychat, Jumble calls the Keychat wallet to zap a note.👇
https://video.nostr.build/2b21e1fc74c3a668197328177f82e7aed40c0a80254b1e96e066140926cbc11c.mp4

2025-04-02 10:14:12

Mini app
https://image.nostr.build/2d784455fa814e394e2cdf706bd30cd93434e232775c273d546575fcb856b567.jpg

2025-03-31 23:44:42

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When you log into Keychat using your main Nostr identity, the people you chat with can see the public notes you’ve posted. Keychat uses a seed phrase, so you can generate multiple IDs. We recommend giving it a try!

2025-03-31 15:17:21

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SimpleX uses the Signal protocol to encrypt messages, and its group chats are likely pairwise groups. It does not use MLS for groups.

2025-03-31 14:53:22

Keychat first learned from Signal, and then from WeChat.
However, the user autonomy in Keychat (ID + Money) is something that neither Signal nor WeChat offers.
#note13sx…nk7y

2025-03-31 14:41:32

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Yes.

2025-03-31 14:37:32

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We've compared these four message encryption schemes, and we hope it's helpful.
#nevent1q…t8yr

2025-03-31 14:26:55

Neither early nor late, the timing is just right.
#note1dhw…0akc

2025-03-31 14:24:01

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We’ve caught a good timing. The idea of MLS was first proposed in 2016, and the official standard (RFC 9420) wasn’t released until July 2023. OpenMLS only became roughly usable in 2024 and is still in its early stages.

2025-03-31 13:56:40

Some updates:
We've finally sorted out the Apple developer account. We expect to release the iOS version of Keychat within a week or two, and possibly a macOS version as well (although the UI isn’t fully optimized for large screens yet).
We're currently revising our MLS group implementation. We've studied the codebases of NIP-104 and White Noise in depth and learned some useful design ideas—such as encrypting MLS messages using NIP-44 and hiding the `group_ID`. We’ve also been posting comments and discussing better mechanisms, like more efficient ways to update the MLS group’s receiving addresses. Ultimately, we hope different MLS clients will be able to interoperate.

2025-03-31 13:47:14

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#nevent1q…qlca

2025-03-31 13:21:34

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Thanks. Keychat first learned from Signal, and then from WeChat.

2025-03-31 12:48:15

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Yes, MLS groups are still in the testing phase, and we’re continuing to improve them.

2025-03-31 12:22:48

We summarize different end-to-end encrypted group messaging schemes.
Keychat supports pairwise group (small group) and MLS group (large group).
#note1qu6…pvdk

2025-03-28 11:20:04

👍
https://image.nostr.build/6dabe15c9d360e0c5703a1d115691e0734aa2824264f9be322881f3f946bc6e4.jpg
#note1vq3…72lc

2025-03-27 11:06:14

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When NIP17 group members upgrade to a client that supports MLS, the new client will generate and upload a key package to the relay. The group owner can then fetch all members’ key packages from the relay to create a new MLS group chat. This should allow for a smooth upgrade.

2025-03-27 07:40:59

Shared vision, different approach.
#note16t0…z8sk

2025-03-27 06:39:54

We can use multiple chat apps at the same time.
We can use multiple browser apps at the same time.
#note18tq…j2tw

2025-03-26 15:11:44

For a chat app, it only takes you and a friend using it for it to be useful—since your messages go directly to them.
A microblogging app, on the other hand, needs a critical mass of users to be effective—because your posts are broadcast to everyone, and the more users there are, the more interaction you’ll get.
Maybe that’s why there are more chat apps than microblogging apps.
#note1khg…kcfe

2025-03-25 10:56:04

👍
In the Bitcoin era, using your own PoW instead of ecash sat stamps is like going back to the Bitgold or B-money era.
#note1ka2…rg27

2025-03-25 10:36:51

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Ecash sat stamp

2025-03-25 10:36:20

Ecash sat stamp
#note1ka2…rg27

2025-03-22 02:25:57

We are still improving and optimizing MLS groups. Please note that future MLS groups may not be compatible with the current version.
#note1usn…02mz

2025-03-22 02:17:58

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Something like this? 👇We can add this feature later on. For now, our top priority is optimizing MLS group.
https://image.nostr.build/6011d3ecdfd7ed4ece0978b96ad6eaf10a3ab298c5f2ce21cb7147af3395c0eb.jpg

2025-03-21 03:45:42

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note13sx98f0zzwncv830wksn63ky0eax9fm92rz08my2d9vtwa7zst5q59nk7y

2025-03-21 03:20:09

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The Keychat browser simply uses the underlying WebView component of the operating system.