Nostr notes by Mr.Cow

Nostr event nevent1qqsdc4j9km80prtxum5jf690wqkvekw88zt6jnf7waw4x5p7vsgvx4czyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksyv26s0

2026-10-26T07:04:37Z

GM nostr #coffeechain

Wtf?

2026-10-23T13:41:17Z

In reply to nevent1q…t0ac
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Wtf?

Was, sowas gibts noch? 😅

2026-10-06T10:50:39Z

In reply to nevent1q…zk4r
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Was, sowas gibts noch? 😅

Wuling Bingo Pro, hört sich nice an 😂

2026-10-06T10:44:04Z

In reply to nevent1q…7wff
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Wuling Bingo Pro, hört sich nice an 😂

Da spricht also der Messias zu weinen Jüngern, zu arg 🙃

2026-09-18T15:04:15Z

In reply to nevent1q…g6dz
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Da spricht also der Messias zu weinen Jüngern, zu arg 🙃

Looks awesome!

2026-09-16T05:27:35Z

In reply to nevent1q…gj0v
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Looks awesome!

Alles Fotzen außer Mama!

2026-09-16T05:26:56Z

In reply to nevent1q…gqgd
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Alles Fotzen außer Mama!

😂

2026-09-13T15:04:36Z

In reply to nevent1q…c3ca
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😂

Nostr event nevent1qqsghnzhuskruhh0ra25cd384a24r5nt03d2k0ze0jrdhqfp3apfv0szyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksm068eu

2026-09-11T06:45:17Z

GM have a nice friday! 🐮 #coffeechain

I like Kajal IV

2026-09-10T09:15:47Z

In reply to nevent1q…9arq
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I like Kajal IV

Only for 5000$

2026-09-10T06:42:02Z

In reply to nevent1q…es4z
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Only for 5000$

Brrrrrr 🖨️

2026-09-10T06:39:59Z

In reply to nevent1q…3k4e
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Brrrrrr 🖨️

Whitch one?

2026-09-10T06:38:08Z

In reply to nevent1q…nwvk
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Whitch one?

Mou 🐮

2026-09-02T07:52:44Z

In reply to nevent1q…py0n
_________________________

Mou 🐮

Nostr event nevent1qqsfqxptygl5wk3cnftqrek5cr7wc6x0fs7a4zc9za5nx77u2053qkgzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksefmm2u

2026-08-28T06:22:12Z

GM, have a nice friday! #coffeechain 🐮

This was on PS5, 30 FPS....

2026-08-28T06:17:18Z

In reply to nevent1q…pp30
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This was on PS5, 30 FPS....

What is FPV?

2026-08-28T06:15:52Z

In reply to nevent1q…vanf
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What is FPV?

What do you think about GTA, I think you didn't see much in ...

2026-08-28T05:46:35Z

In reply to nevent1q…k8ay
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What do you think about GTA, I think you didn't see much in the trailer, it looked great but it also looked very staged.

Great! 😁

2026-08-21T06:43:00Z

In reply to nevent1q…gtgf
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Great! 😁

Holy moly, is this a movie?

2026-08-20T09:47:50Z

In reply to nevent1q…rfu8
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Holy moly, is this a movie?

GM ma fren! ✌️🐮

2026-08-19T06:18:33Z

In reply to nevent1q…h7qy
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GM ma fren! ✌️🐮

Nostr event nevent1qqsgzzc26hfqz99cn6datkmnc7vts2z6pkwe6uvgnf39dzxwf8yhr7szyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksujgu6y

2026-08-17T06:23:46Z

GM nostr, have a nice week! #coffeechain 🐮

Thank god for nostr 😅

2026-08-13T11:19:45Z

In reply to nevent1q…r57u
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Thank god for nostr 😅

GM dude!

2026-08-05T06:46:05Z

In reply to nevent1q…p4yj
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GM dude!

As a cow, this is not fair ☝️

2026-08-05T06:45:10Z

In reply to nevent1q…9taq
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As a cow, this is not fair ☝️

Gibt es einen link zu buzz in zapstore?

2026-08-03T05:19:13Z

In reply to nevent1q…s9nc
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Gibt es einen link zu buzz in zapstore?

Is that a thing?

2026-07-25T07:53:12Z

In reply to nevent1q…ch0q
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Is that a thing?

Nostr event nevent1qqsf9pu8qpuffcqr0a7z4w0emygmnkxl622z3rxr39crdkfgte74s3czyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksp2ez0r

2026-07-24T06:16:06Z

GM nostr, have a nice friday! 🐮 #coffeechain

GM brother 🐮

2026-07-24T06:14:22Z

In reply to nevent1q…p60k
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GM brother 🐮

Sieht richtig nice aus 😁✌️

2026-07-19T16:58:19Z

In reply to nevent1q…7xtv
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Sieht richtig nice aus 😁✌️

Looks nice

2026-07-18T08:21:47Z

In reply to nevent1q…pv88
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Looks nice

Hi Nostr the dad from this child is a Kindergarden buddy from me. ...

2026-07-17T17:11:22Z

Hi Nostr the dad from this child is a Kindergarden buddy from me.
If you have one or the other shitcoin, it would be nice to pull it. 😅✌️🐮

https://www.gofundme.com/f/jaron-3-mochte-teilhaben-und-das-leben-normal-geniessen?attribution_id=sl:71037352-1f5b-4985-8ac5-9dae10334668&lang=de_DE&ts=1784229585&utm_campaign=fp_sharesheet&utm_content=amp20_control&utm_medium=customer&utm_source=whatsapp

#nostr #coffeechain #asknostr Einundzwanzig (nprofile…h6g6)

"Und werde die Hure deines Hauses" fehlt noch auf dem ...

2026-07-17T09:22:55Z

In reply to nevent1q…3rvg
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"Und werde die Hure deines Hauses" fehlt noch auf dem Plakat

Bei mir war gestern Unwetter, mein ganzes Gemüse ist über den ...

2026-07-17T08:43:12Z

In reply to nevent1q…cq7r
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Bei mir war gestern Unwetter, mein ganzes Gemüse ist über den Jordan gegangen 🙃

Nostr event nevent1qqsw5u4jpe0nh7sptewp2el2qtx99fdy89cx6uajzxjyev2pmssvh3czyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks7gsyg9

2026-07-08T05:21:18Z

GM guys, have a nice week! #coffeechain 🐮

@nprofile…h6g6 is the best right now!

2026-07-03T07:55:00Z

Einundzwanzig (nprofile…h6g6) is the best right now!

Ohne kack, was interessiert des den 😂

2026-06-23T16:43:24Z

In reply to nevent1q…twr3
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Ohne kack, was interessiert des den 😂

In the end, this is good for #bitcoin

2026-06-23T07:58:37Z

In reply to nevent1q…zjl3
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In the end, this is good for #bitcoin

Keine Partei ist wirtschaftlich

2026-06-20T07:00:29Z

In reply to nevent1q…xp8f
_________________________

Keine Partei ist wirtschaftlich

Nostr event nevent1qqs8nq5w3kdcr3jqy460fz3sk9l9uwlhawkq95e54d7rw4rh7t45f0qzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksmevf2v

2026-06-19T05:31:08Z

Bullish af!

Nostr event nevent1qqsz9rgtmpeapp7m37x29p2r0ckyqjwxt4ad57unc3chuq8pd0gqcjczyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksnpqvjy

2026-06-18T06:12:26Z

GM you realy nice Nostr-peoples! 🐮 #coffeechain

Good shit ☝️

2026-06-16T13:57:17Z

In reply to nevent1q…kg3x
_________________________

Good shit ☝️

Nostr event nevent1qqsfwaq4ffqds3dys34gxl0dhfkujagwlt8m7tfh7usfk5awl2ehlsgzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnkse95va2

2026-06-16T05:58:02Z

GM bois 🐮 #coffeechain

Nostr event nevent1qqs2rql0n622fadu2hnjls7g4wcj4l69f8g59egqhp55whxst5qv6tgzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksn7te6s

2026-06-15T07:31:15Z

GM guys 🐮✌️ #coffeechain

Gibt es ein favorisiertes Land ?

2026-06-13T08:49:18Z

In reply to nevent1q…gnvy
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Gibt es ein favorisiertes Land ?

I like Amethyst

2026-06-13T08:47:00Z

In reply to nevent1q…eve8
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I like Amethyst

Nice name 😅

2026-06-13T08:46:25Z

In reply to nevent1q…clnt
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Nice name 😅

Awesome! 🐮

2026-06-11T11:25:32Z

In reply to nevent1q…jcfa
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Awesome! 🐮

Yes

2026-06-10T10:54:21Z

In reply to nevent1q…0nsv
_________________________

Yes

Nostr event nevent1qqsxhlvd5nkg4ju4xlyzhd66jvxu6ykm368gwr62zvt44m663el3z2czyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksjage5t

2026-06-01T08:05:56Z

GM guys, have a nice week! #coffeechain 🐮

Nice 💪

2026-05-29T07:08:46Z

In reply to nevent1q…9zq5
_________________________

Nice 💪

AI

2026-05-28T06:12:59Z

In reply to nevent1q…yqa2
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AI

Wenns zu heiß wird einfach mit dem gartenschlauch rein halten ...

2026-05-25T12:30:07Z

In reply to nevent1q…qjym
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Wenns zu heiß wird einfach mit dem gartenschlauch rein halten 😁☝️

Very nice ✌️

2026-05-23T15:36:48Z

In reply to nevent1q…y0cf
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Very nice ✌️

BS :)

2026-05-07T06:52:36Z

In reply to nevent1q…rfnn
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BS :)

Klassischer Markus 😁

2026-05-04T07:22:35Z

In reply to nevent1q…g88r
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Klassischer Markus 😁

Nostr event nevent1qqsf2hnft6pw55m3y5vns7al0lgq58rknt5fdfu6ltezg8fksca72yqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks7ju9ay

2026-05-01T06:49:25Z

GM bois and grills! 🐮 #coffeechain

What a shit show

2026-04-30T06:44:36Z

In reply to nevent1q…5h0v
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What a shit show

GM

2026-04-27T07:11:23Z

In reply to nevent1q…a5m3
_________________________

GM

Nostr event nevent1qqs2ycq9nmmqgqct082htq9ek745etmuc0kzgmy2xteg5594dpjrpxqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnkssfw59f

2026-04-27T06:04:36Z

GM nostr, have a nice week! 🐮 #coffeechain

Da fehlt noch der Bademantel ☝️

2026-04-26T13:14:37Z

In reply to nevent1q…08sd
_________________________

Da fehlt noch der Bademantel ☝️

GM ✌️

2026-04-22T06:13:14Z

In reply to nevent1q…rvef
_________________________

GM ✌️

Nostr event nevent1qqsvfr43ysm9chte27fhrlmnm7dytjhpysrmcx6nadclumhjgjngywszyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnkslvy6yh

2026-04-22T05:51:44Z

GM. #coffeechain 🐮

Nostr event nevent1qqs2jnltyq2x3au528yaz29q4rqhjs5u0ht9rqzkststxzjx9hazzlqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksdtjfcw

2026-04-21T07:03:59Z

GM you nice people! #coffeechain 🐮

It was a 6 7

2026-04-20T05:15:15Z

In reply to nevent1q…2526
_________________________

It was a 6 7

Max Keiser 🤡

2026-04-20T05:11:21Z

In reply to nevent1q…v3s2
_________________________

Max Keiser 🤡

Nostr event nevent1qqs80pml5cdx0nh2wfetpgpc0zjlk3ltgsp5mst8zu0n6e0qgnqs9eqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks7hc3m7

2026-04-20T05:08:21Z

GM bois and grills, have a nice week! #coffeechain 🐮

Was ist das denn für ne steile These?

2026-04-17T07:02:37Z

In reply to nevent1q…5lne
_________________________

Was ist das denn für ne steile These?

You know what I mean 😁

2026-04-02T11:22:11Z

In reply to nevent1q…4efy
_________________________

You know what I mean 😁

Nostr event nevent1qqsrjadg6s7597yp5savxhxlpjefe2tljgjmpcgxhl557esnwhjhhcczyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksfw9c6d

2026-04-02T08:53:19Z

GM bois, lets have a nice friday! 🐮 #coffeechain

Holy cow! 🐮

2026-04-02T07:13:08Z

In reply to nevent1q…grdk
_________________________

Holy cow! 🐮

Das sollten sich mal die ganzen Blocktrainers durch lesen!

2026-04-02T06:43:11Z

In reply to nevent1q…f486
_________________________

Das sollten sich mal die ganzen Blocktrainers durch lesen!

Nostr event nevent1qqs22xuc7t97y5xkg3ggzlm06m0jy2sx34yp0627emnfvrnanhvlnkczyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks86ylzy

2026-03-31T06:01:27Z

GM, bullish on #bitcoin 💪🐮 #coffeechain

Nostr event nevent1qqsx59fwt9ul43ytrs20nfu8xn6rd33ccux57ulhy3e298y3f4dc3dczyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksf86czr

2026-03-27T07:35:31Z

GM guys, its friday, have fun! 🐮 #coffeechain

Nostr event nevent1qqs0ype75jjv4gwxe4pd9txta2z8fw0xmn6yaukavas7cnm200t20pszyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks2458mt

2026-03-24T07:57:36Z

GM from your favorite cow, folks! 🐮 #coffeechain

The fuck? 👌 #naddr1qq…79ra

2026-03-19T11:53:01Z

The fuck? 👌

quoting
naddr1qq…79ra

Open-Source DOOM: How We Brought Real-Time Multiplayer to a 1993 Classic. No Servers Required.

A Breakthrough in Decentralized Gaming by JSKitty (npub16ye…g4wn)

In May 2021, Cloudflare did something wonderful. They took DOOM -the 1993 game that defined an entire genre -compiled it to WebAssembly, wired up WebSocket multiplayer through their Durable Objects edge platform, and wrote a fantastic blog post about it. As Celso Martinho put it: "Running Doom is effectively the new 'Hello, World' in computing."

We loved it. And then we thought: what if we could take it further?

What if multiplayer DOOM didn't need Cloudflare's servers -or anyone's servers? What if it didn't need the internet at all? What if you could send a 4MB file to a friend in a chat message and be fragging each other within seconds, purely peer-to-peer, with the game feeling like a modern real-time shooter instead of a 1994 LAN party?

That's what we built. We call it Open-Source DOOM.

It's powered by a stack of open technologies: Chocolate Doom compiled to WebAssembly via Emscripten, distributed as a WebXDC mini-app, with peer discovery over Nostr, end-to-end encryption via Marmot (MLS over Nostr), and real-time P2P data transport through Iroh (QUIC-based gossip). Every layer is open-source. Every packet is encrypted. No servers required.

What Cloudflare Built (And Why It's Great)

Credit where it's due. Cloudflare's doom-wasm project did the hard work of porting Chocolate Doom -> the faithful open-source recreation of the original DOOM engine -> to WebAssembly using Emscripten. That alone is a serious engineering effort. They then wrote net_websockets.c, a transport adapter that replaced DOOM's original IPX/UDP networking with WebSocket connections routed through Durable Objects on Cloudflare's edge network.

Their architecture looked like this:
Player A (Browser)  ←WebSocket→  Cloudflare Edge (Durable Object)  ←WebSocket→  Player B (Browser)
A Durable Object acted as the game room -maintaining a routing table of connected players and forwarding packets between them. Clean, elegant, and a great demo of edge computing.

But there was a catch.

What they kept the same

Cloudflare didn't modify DOOM's actual netcode. The game still used its original lockstep networking model from 1993 -the same protocol designed for four PCs on a local area network connected by coaxial cable. Every player sends their inputs (which keys they pressed) to every other player, every single frame, and the game freezes until everyone's inputs arrive.

As their blog post acknowledged: "The game only advances when everyone receives the commands from all the other players in the group."

This worked in 1993 when your LAN had sub-millisecond latency. Over the internet, through WebSockets, through a routing layer? It meant choppy gameplay, freezes whenever anyone's connection hiccupped, and a gameplay experience that felt more like a slideshow than a shooter.

The Durable Object was also a single point of failure and a centralised dependency. No Cloudflare, no DOOM.

What We Changed (Everything Except the Game Itself)

We forked Cloudflare's doom-wasm project and rebuilt the entire networking stack from scratch. Not just the transport layer -the fundamental model of how the game synchronises state between players.

Here's the before and after:

Cloudflare's DOOM Open Source DOOM

Transport WebSockets → Cloudflare Edge P2P gossip via Iroh (QUIC)

Server Durable Object (centralised) Auto-elected from players (decentralised)

Sync model Lockstep (1993 original) Real-time hybrid (snapshots + interpolation)

Damage Simulated locally by all clients Host-authoritative events

NPCs/Monsters Simulated locally by all clients Host-authoritative snapshots

Late join Not supported Fully supported

Internet required Yes (Cloudflare Workers) No (works offline, P2P)

Delivery Website (silentspacemarine.com) 4.2MB file in a chat message

Let's break down each piece.

1. No Servers, No Problem

The Simple Version

Cloudflare's DOOM needed their servers to work. Ours doesn't need any servers. When you open the game, your device automatically figures out who should be the "host" --no configuration, no IP addresses, no port forwarding, no sign-ups. It just works.

The game runs inside a .xdc file, essentially a tiny 4.2MB zip archive containing the entire game. You literally send it as a file in a chat message. Your friend opens it. You're playing DOOM together. The data travels directly between your devices through the chat app's peer-to-peer channels.

The Nerdy Version

We replaced net_websockets.c with net_webxdc.c -a transport module that speaks the WebXDC realtime channel protocol instead of WebSockets.

WebXDC is an open standard for sandboxed web apps distributed inside chat messages. The app has zero internet access, no fetch, no XMLHttpRequest, nothing. The only communication channel is webxdc.joinRealtimeChannel(), which gives you an unreliable broadcast pipe to other instances of the same .xdc file in the same chat.

Under the hood (in our primary platform, Vector), this channel is backed by Iroh, a QUIC-based peer-to-peer gossip protocol. Messages travel directly between devices, relayed through lightweight Iroh relay nodes only when direct connections aren't possible. There are no game servers, no routing tables, no Durable Objects.

Peer discovery happens over Nostr, the decentralised social protocol. When you open a game, your Iroh node address is published as a Nostr event so other players can find you and establish a direct connection. The connection itself is encrypted end-to-end via Marmot, which implements the MLS (Messaging Layer Security) protocol over Nostr. So every packet of DOOM multiplayer data, every position snapshot, every damage event, every frag, is encrypted with forward secrecy before it ever leaves your device.

The wire format is minimal:
[to: uint32 LE (4 bytes)][from: uint32 LE (4 bytes)][doom_payload]
JavaScript routes incoming packets by destination UID -only packets addressed to you (or broadcast address 0) get delivered to the WASM engine. Everything else is silently dropped.

For performance, Vector provides a WebSocket fast-path: the app connects to ws://127.0.0.1:{random_port}/{token} -a localhost WebSocket server spun up by the Rust backend -giving near-zero-latency access to the Iroh gossip sender. Binary frames go straight to sender.broadcast() with zero copies. Fallback path uses Tauri invoke with base91 encoding.

2. Who's the Server? Magic.

The Simple Version

In a normal online game, someone runs a server, and everyone connects to it. In Open Source DOOM, there is no predetermined server. When you open the game, all players silently negotiate who becomes the host. The person who opened the game first wins. This happens automatically in about three seconds, and you never even notice it.

The Nerdy Version

Server election uses a dead-simple timestamp protocol over the broadcast channel:

Every instance broadcasts 4 magic bytes ([42, 42, 42, 42]) every 300ms: "I exist, who's the server?"

Every instance responds to discovery requests with: [43, 43, 43, 43][padding(4)][timestamp(8)] -where timestamp is Date.now() from when the app first opened

The instance with the earliest timestamp wins

After 3 seconds with no earlier challenger, you declare yourself server

The elected server re-broadcasts its beacon every 3 seconds so late-joiners can discover it

The server gets instanceUID = 1 (hardcoded). Clients get a random UID in 1–65534. This UID becomes their network address for the entire session -no DNS, no IP addresses, no NAT traversal headaches.

The whole election algorithm is about 80 lines of JavaScript. It works over any broadcast transport. No configuration needed.

3. From Lockstep to Real-Time (The Big One)

The Simple Version

Original DOOM multiplayer works like a group of people writing a letter round-robin. Nobody can write their next line until everyone has received and read the previous line. If one person is slow, everyone waits.

We changed it to work more like a live conversation. Everyone talks at their own pace. If you miss a word, you can still follow along because the speaker periodically summarises where things stand. The result feels like a modern shooter -smooth movement, responsive controls, no freezing.

The Nerdy Version

This was the most fundamental change: replacing DOOM's pure lockstep synchronisation with a hybrid real-time model. The ticcmd backbone remains (it's too deeply embedded in Chocolate Doom's deterministic physics to remove), but we layered three correction systems on top:

a) Position Snapshots + Exponential Smoothing

Every 2 tics (~57ms at 35 FPS), each player broadcasts a snapshot of their state:
int data[9] = {
    mo->x, mo->y, mo->z,        // World position (fixed-point)
    mo->angle,                    // Facing direction
    mo->momx, mo->momy, mo->momz, // Velocity
    attack_weapon,                // 0=idle, 1-9=attacking with weapon N
    latency                       // Round-trip time (ms)
};
Remote players don't run DOOM's physics engine at all. Instead, D_TickPlayerInterp() runs every tic:
Extrapolate the target forward using stored momentum: target_x += momx
Smooth toward the target, closing 60% of the remaining gap each tic:
#define INTERP_FRAC  39322  // 0.6 * 65536 (fixed-point)
mo->x += FixedMul(target_x - mo->x, INTERP_FRAC);
mo->y += FixedMul(target_y - mo->y, INTERP_FRAC);
Teleport detection: if the delta exceeds 128 map units, snap instantly (player respawned or hit a teleporter)
One subtle but critical detail: angle is NOT interpolated. The ticcmd's angleturn field is applied deterministically by P_MovePlayer() and stays in sync across machines. Interpolating angle toward a stale snapshot would fight the ticcmd, causing visible rotation jitter of up to 90 degrees. We learned this the hard way.

b) Attack Animation Sync

Remote players' attacks are driven by snapshot data, not ticcmds. When a snapshot reports attack_weapon > 0, we set the S_PLAY_ATK1 animation state and play the weapon fire sound. An 8-tic animation lock prevents local state transitions from overriding it.

To prevent feedback loops, we track last_received_attack[] -the raw flag as received from the network -and broadcast that, not the lock-modified mobj state. Without this, attack animations would echo infinitely.

4. "I Shot You!" "No You Didn't!"

The Simple Version

In the original DOOM, every computer runs its own copy of the game physics. When you shoot someone, your computer calculates the damage, and their computer calculates the damage, and because the game is in lockstep, they always agree.

With our real-time model, that guarantee vanishes -your screen and theirs might show slightly different positions. So we made one player (the host) the referee. When you shoot someone, you tell the host "I hit Player 2 for 50 damage". The host checks the physics, applies the damage if it's valid, and announces the result to everyone. One truth, no arguments.

The Nerdy Version

We implemented an event-based host-authority model for all game-changing state:

Damage path:
Client A fires weapon → bullet hits Player B locally
  → Client A sends DAMAGE_EVENT to host: {target: B, damage: 50, source: A}
  → Client A applies VISUAL FEEDBACK ONLY (screen flash, attacker tracking)
  → Client A does NOT reduce Player B's health

Host receives DAMAGE_EVENT:
  → Sets damage_from_event = true (bypasses remote-source skip)
  → Calls P_DamageMobj() with full physics simulation
  → New health broadcasted via HEALTH_AUTH packet next snapshot cycle

All clients receive HEALTH_AUTH:
  → Apply as ground truth
  → Host says dead, client says alive? → P_KillMobj()
  → Host says alive, client says dead? → Trigger respawn
  → Health decreased? → Play pain animation
The damage_from_event flag is critical. Without it, the host faces a double-damage problem: it receives both the ticcmd attack (from the lockstep backbone) AND the explicit damage event. The flag ensures only the event path applies.

Other host-authoritative systems: - USE events: Client presses 'E' near a door → sends USE_EVENT → host calls P_UseLines() → door opens for everyone - Respawns: Client dies → sends RESPAWN_REQUEST → host sets playerstate = PST_REBORN - Kill messages: Host broadcasts KILL_MSG when a player dies → displayed on all screens

5. Making Monsters Agree

The Simple Version

DOOM has dozens of monsters per level, each running their own AI -chasing you, shooting fireballs, infighting with each other. In the original game, every computer simulates every monster identically (because lockstep ensures they all see the same inputs). In our version, only the host simulates the monsters. Everyone else just sees the results -like watching a puppet show where only the puppeteer knows the script, but the audience sees the performance in real-time.

The Nerdy Version

We built a full NPC synchronisation system (p_netsync.c/h):

Registry: Every monster and barrel gets a unique net_id via P_NetAssignId():
mobj_t *net_mobj_table[MAX_NET_MOBJS];  // 512 slots
unsigned short net_id_counter;            // Sequential allocator
Host broadcasts (every 2 tics) a compact binary snapshot:
[npc_count: u8][gametic: u16]
Per NPC (20 bytes): net_id(2) x(4) y(4) z(4) angle(1) statenum(2) health(2) flags(1)
[sector_count: u8]
Per changed sector (10 bytes): sector_id(2) ceiling(4) floor(4)
[missile_count: u8]
Per missile (32 bytes): source_net_id(2) type(2) x(4) y(4) z(4) momx(4) momy(4) momz(4) angle(4)
Client-side: In P_MobjThinker(), clients skip physics entirely for any mobj with net_id > 0. Only the animation tic counter runs. State changes use P_SetMobjStateNoAction() -which applies the visual state WITHOUT executing action functions. This prevents clients from independently spawning projectiles, running AI decisions, or playing duplicate sounds.

The sector data keeps doors and lifts in sync. The missile data ensures fireballs and rockets appear on all screens.

6. "Room for One More?" -Mid-Game Joining

The Simple Version

Original DOOM didn't let you join a game already in progress. Everyone had to be there at the start, or too bad. Our version lets players drop in mid-game. You open the .xdc, the game finds the server, and you spawn in -even if everyone else is already knee-deep in the dead.

The Nerdy Version

Late joining required solving several hairy problems:

Tic synchronisation: The late joiner's tic counter is meaningless -they weren't there for tics 0 through N. When the server accepts a late join, it sends settings->start_tic set to the current server tic. The client aligns its recvtic, maketic, and gametic to this value, syncing the 8-bit tic sequence numbers with the server's counter.

Double-slot bug: We found that NET_SV_AssignPlayers() could assign the new client to a slot that was already used, creating a ghost duplicate. The fix: HandleLateJoin() explicitly clears any pre-existing slots for the new client before assigning a fresh one.

Ghost body cleanup: When a player disconnects and reconnects (or the quit/rejoin cycle fires), their old mobj lingers in the world as an invisible collision obstacle. P_SpawnPlayer() now checks for and removes any existing mobj before spawning:
if (p->mo) {
    p->mo->player = NULL;
    P_RemoveMobj(p->mo);
    p->mo = NULL;
}
Name propagation: When a new player joins, every existing player re-broadcasts their name, so the joiner's HUD displays the correct names instead of the defaults ("Green", "Indigo", "Brown", "Red").

7. Fits in a Chat Message

The Simple Version

The entire game -engine, levels, monsters, weapons, networking, touch controls, gamepad support, all of it -fits in a 4.2 megabyte file. That's smaller than most photos your phone takes. You send it in a chat message like you'd send a meme. Your friend taps it, and they're in the game. No app store, no downloads, no accounts, no updates.

The Nerdy Version

The .xdc format is just a ZIP archive with a different extension. Ours contains:

File Size (compressed) Purpose

vector-doom.wasm ~2.7 MB Chocolate Doom engine (Emscripten, -O3)

doom1.wad ~1.7 MB DOOM shareware levels (freely distributable)

vector-doom.js ~160 KB Emscripten runtime (terser-minified, 58% reduction)

index.html ~12 KB UI, touch controls, gamepad support, CRT visual theme

webxdc-net.js ~3 KB Server election + packet routing

icon.png ~90 KB App icon

bg.jpg ~100 KB Background artwork

default.cfg ~2 KB Default key bindings

manifest.toml ~100 B WebXDC metadata

The WASM binary and WAD compress extremely well in ZIP (65% and 58% respectively), bringing the total to 4.2MB.

The build pipeline: 1. Emscripten compiles Chocolate Doom + our modifications to WASM (emmake make -j4) 2. webxdc-net.js is injected as --pre-js (runs before WASM initialises) 3. JS is minified with terser in parallel 4. HTML is minified (strip comments, collapse whitespace) 5. Everything zipped at maximum compression (zip -9)

The game runs on any WebXDC-compatible messenger. We built it for Vector (a Nostr-based messenger), but it works in Delta Chat and potentially any app that implements the WebXDC standard.

The Full Stack, From Keypress to Frag

Here's what happens when you press the fire button on your phone:
1. Your finger hits the Fire button (HTML touch event)
2. JavaScript calls Module._inject_key_event(0, 32)     // keydown, spacebar
3. DOOM's event queue receives ev_keydown
4. D_ProcessEvents() → G_Responder() builds ticcmd with BT_ATTACK
5. TryRunTics() executes the tic -your weapon fires, P_LineAttack() traces a hitscan
6. Bullet hits Player 2 → P_DamageMobj() → instead of applying damage:
   → NET_CL_SendDamageEvent(target=2, damage=50, source=you)
7. Every 2 tics, your position snapshot broadcasts via realtimeChannel:
   → JS encodes [to(4)][from(4)][snapshot] → WebSocket → Iroh gossip → peer devices
8. Host receives damage event → validates → applies → broadcasts HEALTH_AUTH
9. Player 2's screen: health drops, pain flash plays, kill message appears
10. Your screen: the host's HEALTH_AUTH confirms the kill
Total time from keypress to kill confirmation: roughly 100-200ms depending on network conditions. No servers touched. No corporation involved. Just two chat apps talking directly to each other.

Standing on the Shoulders of Giants

None of this would exist without:

id Software for open-sourcing the DOOM engine in 1997 -a decision that created an entire modding ecosystem and directly enabled everything described here

Chocolate Doom for faithfully recreating the original engine in portable, hackable C

Cloudflare for proving DOOM-in-WebAssembly was viable and open-sourcing their doom-wasm port -the foundation we forked

Emscripten for making C-to-WASM compilation actually work

Iroh (by n0.computer) for the QUIC-based P2P gossip protocol that makes serverless real-time gaming possible

The WebXDC community for defining an open standard for sandboxed web apps in chat messages

And a special note: the networking architecture of Open Source DOOM was designed and implemented as a collaboration between a human developer and an AI (Claude, by Anthropic). Not generated and pasted -collaborated on. Hundreds of iterations, debugging sessions at 3am with hex dumps of gossip packets, heated debates about whether to interpolate angles (don't), and moments of genuine surprise when things just... worked.

Try It

Open-Source DOOM is free, open-source, and available today.

Play it: Download Vector, open Vector Nexus (our decentralised in-app Mini App store), and find DOOM in the Multiplayer category. Send it to a friend or group chat and start fragging - no manual file management needed.

Read the code: The full source is available at github.com/nicholasopuni31/doom-wasm.

Build on it: The WebXDC realtime channel pattern we developed here works for any real-time multiplayer game.

If DOOM is "Hello, World" for computing, then Open Source DOOM is "Hello, World" for decentralised gaming.

Published March 2026. Written by JSKitty (npub16ye…g4wn)

	Cloudflare's DOOM	Open Source DOOM
Transport	WebSockets → Cloudflare Edge	P2P gossip via Iroh (QUIC)
Server	Durable Object (centralised)	Auto-elected from players (decentralised)
Sync model	Lockstep (1993 original)	Real-time hybrid (snapshots + interpolation)
Damage	Simulated locally by all clients	Host-authoritative events
NPCs/Monsters	Simulated locally by all clients	Host-authoritative snapshots
Late join	Not supported	Fully supported
Internet required	Yes (Cloudflare Workers)	No (works offline, P2P)
Delivery	Website (silentspacemarine.com)	4.2MB file in a chat message

File	Size (compressed)	Purpose
`vector-doom.wasm`	~2.7 MB	Chocolate Doom engine (Emscripten, -O3)
`doom1.wad`	~1.7 MB	DOOM shareware levels (freely distributable)
`vector-doom.js`	~160 KB	Emscripten runtime (terser-minified, 58% reduction)
`index.html`	~12 KB	UI, touch controls, gamepad support, CRT visual theme
`webxdc-net.js`	~3 KB	Server election + packet routing
`icon.png`	~90 KB	App icon
`bg.jpg`	~100 KB	Background artwork
`default.cfg`	~2 KB	Default key bindings
`manifest.toml`	~100 B	WebXDC metadata

incredible

2026-03-18T10:27:13Z

In reply to nevent1q…3tfs
_________________________

incredible

Moin Chris, deine Kollege sind zu wenig auf Nostr unterwegs, ...

2026-03-16T14:38:40Z

In reply to nevent1q…s9tt
_________________________

Moin Chris, deine Kollege sind zu wenig auf Nostr unterwegs, deswegen teils die bearishe Stimmung. Was hier täglich abgeht, da kann man nur bullish sein!

Based

2026-03-15T10:49:27Z

In reply to nevent1q…8pkf
_________________________

Based

Holy cow, what is this?

2026-03-15T10:42:27Z

In reply to nevent1q…e7et
_________________________

Holy cow, what is this?

Sauber!

2026-03-13T06:20:55Z

In reply to nevent1q…p4z0
_________________________

Sauber!

Nostr event nevent1qqst8ww06vf6x76n28rxczvdsqmykx3t2mzfnlcv6tfmjw2n8pptg5szyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks73p997

2026-03-13T06:19:21Z

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Nostr event nevent1qqsv6sumy20ekm0926wql7qp3yjcgrxlw3n30jczlaagzfdfns4atsqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnkscj0mcx

2026-03-12T06:38:16Z

GM bois and grils #coffeechain 🐮

Nostr event nevent1qqsg6p5hu60rae2d30ph0c0xx8nc36mjvnljj0rl7wenf0tualt6qaqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksc4esac

2026-03-11T07:11:56Z

GM nostr, have fun! #coffeechain 🐮

What a bullshit

2026-03-11T07:08:59Z

In reply to nevent1q…rvrw
_________________________

What a bullshit

Please create an ln address so that you can be zapped

2026-03-09T09:15:36Z

In reply to nevent1q…pzkw
_________________________

Please create an ln address so that you can be zapped

Three cups of coffee and enjoying the little things in everyday ...

2026-03-09T09:14:05Z

In reply to nevent1q…mff7
_________________________

Three cups of coffee and enjoying the little things in everyday life 😁👌

Nostr event nevent1qqsxl9ykp9hhth293zzum7sdeplh8swfcdddhrn95n3g4x2qgumhrcgzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnkser0ur7

2026-03-09T06:59:39Z

GM on monday, fresh week, have fun! #coffeechain 🐮

GM #nostr its friday 🎉 #coffeechain 🐮

2026-03-06T07:53:45Z

GM #nostr its friday 🎉
#coffeechain 🐮

GM sis! 🐮

2026-03-05T12:40:23Z

In reply to nevent1q…e3n5
_________________________

GM sis! 🐮

Das ist ein todsicheres ding 😂

2026-03-03T10:28:50Z

In reply to nevent1q…fvtx
_________________________

Das ist ein todsicheres ding 😂

GM #nostr Focus on the signal not on the noise! #coffeechain 🐮

2026-03-03T06:36:13Z

GM #nostr
Focus on the signal not on the noise!
#coffeechain 🐮

Nostr event nevent1qqsz678a7r78phzf64rnq576wqle8uz9u0e730rmwlsf4n70c27wd5czyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks42kxyr

2026-02-27T07:21:46Z

GM bois and grils, its friday 🎉 #coffeechain 🐮

Nostr event nevent1qqsyzdla58uclwdgyl2vyktwely8k4n2wx73rmrsnfmu4y4hs8c852szyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks2gu4eg

2026-02-26T05:58:30Z

GM bitcoiner! #coffeechain 🐮

Nostr event nevent1qqs2pze3vjnulyxp4uk7qqq7c2z0m9ljwcvp2r7nejhh8rs3vfprflszyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksrvc3va

2026-02-24T08:08:13Z

GM Nostr! #coffeechain

Nostr event nevent1qqsg0wr26q7jz3x2283ue8ad3yd2zvseguqld0urrnlqqyc7l89qf7szyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnksc6fsaq

2026-02-22T07:49:44Z

GM #nostr have a nice sunday! #coffeechain 🐮

Nostr event nevent1qqsghc404lufu3qurgamfkc08c2pzm5wdjgujx99jfwsrhvu6vr4ndszyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnkshdvzqa

2026-02-20T06:42:29Z

GM guys its friday! 🐮🎉 #coffeechain

Nostr event nevent1qqs8kkfmqmt9flal2yeuspp0fqmvj9zf72qn3d27r94f204742rz7dqzyzc599rhhrvs5wtjawl3g9aqt5ryc67zjts8tajs3raxkg4xksnks6ruhh5

2026-02-19T06:43:03Z

GM #Nostr have a nice day! #coffeechain 🐮

Bestimmt 😂

2026-02-10T17:29:17Z

In reply to nevent1q…ggwp
_________________________

Bestimmt 😂

#metoo

2026-02-06T08:10:34Z

In reply to nevent1q…jhhn
_________________________

#metoo