Nostr notes by Danny

Bitcoin is not my entire personality bro lol

2026-04-17T14:15:02Z

In reply to nevent1q…udmx
_________________________

Bitcoin is not my entire personality bro lol

Today I learned: The root of the word galaxy comes from the greek ...

2026-04-16T17:21:20Z

Today I learned:

The root of the word galaxy comes from the greek word for milk: gala. This is why we're in the milky way.

today more like 5000

2026-04-13T10:59:43Z

In reply to nevent1q…pyny
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today more like 5000

not trying to offend most of europe... but is kicking a ball more ...

2026-04-13T06:52:58Z

In reply to nevent1q…st5z
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not trying to offend most of europe... but is kicking a ball more important than everything that happens on the internet and happens to use cloudflare?

maybe I'm just a weirdo

I hear you but to me this situation is beyond crazy... How is the ...

2026-04-13T06:51:49Z

In reply to nevent1q…dv4d
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I hear you but to me this situation is beyond crazy... How is the average non-technical person supposed to deal with this?

I don't like cloudflare's control over the internet at all, but the fact is that it exists, and billions of people rely on it every day.

How is it possible that a football league is able to enforce a nation-wide IP block to cloudflare at certain hours?

---

We really need to build a new internet and somehow convince the average person to use it... at this point FIPS may be a matter of survival if we care about decentralization

Nostr event nevent1qqs9dpwm5l54rcut3jlt9sn83z2jzyl6p7uv6xehfndfuwjm9keqyrszypnxw52cucecl6ylmfqcus4qhu4852cny5zd6drlq9dp39cmv3zrqalp7c6

2026-04-13T06:16:50Z

In reply to nevent1q…xwlx
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https://news.ycombinator.com/item?id=47738883

https://www.laliga.com/noticias/nota-informativa-en-relacion-con-el-bloqueo-de-ips-durante-las-ultimas-jornadas-de-laliga-ea-sports-vinculadas-a-las-practicas-ilegales-de-cloudflare

Did you know that you can't access websites using cloudflare ...

2026-04-13T06:14:08Z

Did you know that you can't access websites using cloudflare in spain when there's a football match on?

I'm not making this up

I can't type the words "absolutely right" without ...

2026-04-11T04:38:35Z

I can't type the words "absolutely right" without laughing or making it seem like a joke, even when I don't intend it to lol

Did you know that TTF fonts have a virtual machine? Yeah... ...

2026-04-07T07:35:08Z

Did you know that TTF fonts have a virtual machine? Yeah...

quoting
naddr1qv…g396

There's a category of information I think of as cursed knowledge. Facts that make your day measurably worse just by learning them. You can't unlearn them. You just carry them now.

Here's one: TrueType fonts have a virtual machine inside them. A real one. With an instruction set, a stack, and the ability to execute arbitrary code.

I know. I'm sorry.

If your first reaction is "that can't be right," I get it. Mine was too. Then I saw someone run Doom inside a font.

https://4rh1t3ct0r7.github.io/ttf-doom/

That's Doom. In a TTF file. Rendered through the font engine on your machine.

Now, you might be thinking: "Sure Danny, but that probably needs JavaScript to handle character positioning and input. The font isn't really doing the work." Fair point. Reasonable objection.

So here's Fontemon, a legally distinct Pokemon-like game, running entirely inside a font file. You can download it and play it in... Vim or something, but I guess any text field works. You don't need a browser or javascript, all you need is your operating system's font renderer doing things font renderers were never meant to do.

https://www.coderelay.io/fontemon.html

At this point you might be reaching for a justification. "OK but this isn't really a virtual machine. Fonts need to support complex scripts, right? Arabic, Devanagari, CJK layouts. It makes sense that there's some programmability in there for handling all the world's writing systems."

And yeah, I don't speak every language. But I'm fairly confident that no human writing system requires the computational power to run a large language model.

Because someone did that too.

https://fuglede.github.io/llama.ttf/

That's llama.cpp, the inference engine behind a lot of local LLM setups, compiled to run inside the TrueType instruction set. An AI model running inside a font. The text is generating itself.

Your system has hundreds of these files installed right now. You load them when you open a PDF, visit a website, read a document. Each one contains a Turing-complete execution environment. Font rendering is, by specification, arbitrary code execution.

There is no patch for this. It's not a bug. It's the spec. It's been the spec since 1994.

You now know this, and you will never look at a .ttf file the same way again.

Now ask yourself how carefully you've vetted the fonts you've installed.

Welcome to cursed knowledge.

Probably. To be honest I have not looked much into how those work

2026-04-03T06:38:08Z

In reply to nevent1q…wgzt
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Probably. To be honest I have not looked much into how those work

Slay the spire is legit really fun. Slay the spire 2 even has a ...

2026-04-03T06:26:51Z

In reply to nevent1q…7g3h
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Slay the spire is legit really fun. Slay the spire 2 even has a fun multiplayer mode

Essentially your eyes are getting tricked. They receive ...

2026-04-03T06:17:02Z

In reply to nevent1q…2zka
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Essentially your eyes are getting tricked. They receive completely contrasting signals.

Here's the same exact image from the original making the coke look blue, and green (not everyone may see the green one, your M and L cones overlap, try to sqyint or look at an angle )

The LLM is incorrect there. The reality is much cooler than ...

2026-04-03T06:05:43Z

In reply to nevent1q…us2z
_________________________

The LLM is incorrect there. The reality is much cooler than "your brain knows coke is red".

For example here there is no blue, and your brain does not associate coke with blue.

The reality is the contrast (pun intended) between the way your eyes perceive color and the way your screen emits them.

I wonder how many people I can upset by using this and pretending ...

2026-04-02T11:30:20Z

In reply to nevent1q…42ye
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I wonder how many people I can upset by using this and pretending to be a knots supporter. Surely that'll upset both sides.

How much does 1 GB of data cost over there right now? Trying to ...

2026-04-02T11:23:35Z

In reply to nevent1q…qvws
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How much does 1 GB of data cost over there right now? Trying to see if I can help

Nostr event nevent1qqs97u5nv8qru8jzupnrnq2zxvdej9ve5av7tstg4hxf7s92zvh46cgzypnxw52cucecl6ylmfqcus4qhu4852cny5zd6drlq9dp39cmv3zrqyumpes

2026-04-02T07:06:57Z

In reply to nevent1q…yryt
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Checked the code, its marmot-ts, nice ~

2026-04-01T10:05:23Z

In reply to nevent1q…ehvd
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Checked the code, its marmot-ts, nice ~

How are you implementing marmot? Are you using marmot-ts or did ...

2026-04-01T09:55:41Z

In reply to nevent1q…n7uz
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How are you implementing marmot? Are you using marmot-ts or did you write your own lib?

I'm asking because its much trickier to build your own than you may think

They're both good in different ways

2026-04-01T09:54:03Z

In reply to nevent1q…59vh
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They're both good in different ways

OMG it even has Warning: include(visitor_count.php): Failed to ...

2026-04-01T08:09:26Z

In reply to nevent1q…epne
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OMG it even has

Warning: include(visitor_count.php): Failed to open stream: No such file or directory in /home/public/kagi.com/index.php on line 6!

@npub1xsg…zazx

2026-04-01T08:07:17Z

In reply to nevent1q…epne
_________________________

Kagi (npub1xsg…zazx)

I don't need to see the other contenders, kagi won april ...

2026-04-01T08:06:51Z

I don't need to see the other contenders, kagi won april fools this year

I'm struggling to understand his logic. First he shoots to ...

2026-03-31T08:04:51Z

In reply to nevent1q…vru3
_________________________

I'm struggling to understand his logic. First he shoots to the sky for fun, obviously a retarded thing to do, then people get angry at him and his reaction is "fine I'm gonna remove the mag and shoot at my hand"????

Did he just... What... No... He can't be that stupid

2026-03-31T08:01:14Z

In reply to nevent1q…u6vu
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Did he just... What... No... He can't be that stupid

the entire codebase is written in python yeah ...

2026-03-27T14:16:45Z

In reply to nevent1q…gqtd
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the entire codebase is written in python yeah

https://github.com/markqvist/Reticulum

regarding packet loss, if your packet takes 2 hours to go through it may not "technically" be packet loss, but it's practically packet loss for the average person, especially if the goal is the one I want: replacing all ISPs

packet loss is high, latency is high, no QoS, also python ...

2026-03-27T09:25:12Z

In reply to nevent1q…wz8d
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packet loss is high, latency is high, no QoS, also python implementation

My thoughts is that if we can get an improved version of ...

2026-03-27T06:55:59Z

In reply to nevent1q…7x0w
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My thoughts is that if we can get an improved version of reticulum up Abd running, and widespread in the next decade, ISPs are gonna have trouble... But that's a huge assumption of course

Just a PSA: fuck starlink. I can't wait till mesh networks ...

2026-03-26T20:37:12Z

Just a PSA: fuck starlink. I can't wait till mesh networks replace ISPs for the average person.

---

got this email:

oh nice, my plan is getting cheaper right?

Wrong, this is my current plan:

and after this oh so generous offer (where I save 1 entire euro, so generous) it's gonna become this

Wait, isn't that half the speed I'm currently getting (on a good day by the way)?

Yes, yes it is. So what if I want to keep the 400mbps? Easy, I should upgrade to Residential Max!

What's that? 59 euros/month. So 59 euros is cheaper than 40, huh?

Must be some math I'm not familiar with, perhaps math has changed recently, and we live in the age of ai... soo let me ask claude

me: claude, is 59 more than 40?
claude: yes

So fuck you starlink!

because this is hard to read ...

2026-03-25T15:07:28Z

In reply to nevent1q…d8mm
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because this is hard to read

(I know, problem of my own making)

@npub1q3s…d26p biggest miss in ditto is that users should be ...

2026-03-25T15:02:59Z

Alex Gleason (npub1q3s…d26p) biggest miss in ditto is that users should be allowed to have different fonts per section, not just one global font.

CSS in general would be nice, but different fonts for header, name and content would be nice

well, there's definitely some code that wasn't human ...

2026-03-24T19:05:09Z

In reply to nevent1q…vt4s
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well, there's definitely some code that wasn't human written, but the majority is good old traditional elbow grease

Yeah, I call it fastr. And the only goal I have is to be at twice ...

2026-03-24T18:05:19Z

In reply to nevent1q…2u8e
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Yeah, I call it fastr. And the only goal I have is to be at twice better than strfry in every bench and so far I've succeeded.

It's buggy tho, and to fix certain bugs I will have to drop performance a little bit, so take those numbers with a grain of salt. They're representative, but expect a drop of 10-20%.

I may have a solution for those issues in the coming weeks. Lower ...

2026-03-24T06:27:07Z

In reply to nevent1q…c4fc
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I may have a solution for those issues in the coming weeks.

Lower disk space (about 1/5th), significantly lower RSS (9x, close to 10x), significantly lower write strain on disk (over 500 times in fact during writes, haven't benchmarked read yet), lower CPU usage (currently 10-25x, might change), faster queries (8x), significantly faster ingest (200x).

To be clear the software exists already so I'm not speculating, but it needs a lot of work and improvements.

Was playing the new slay the spire 2, when I saw this card ...

2026-03-22T17:36:49Z

Was playing the new slay the spire 2, when I saw this card

White Noise (nprofile…9puf)

How the fuck have we gotten to a world where somehow people think ...

2026-03-22T11:45:10Z

In reply to nevent1q…9qmz
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How the fuck have we gotten to a world where somehow people think operating systems SHOULD verify the user's age...

It's California so of course they're crazy, but as it's always the case, what California does, the rest of the world copies

Yeah

2026-03-21T14:02:09Z

In reply to nevent1q…8qs8
_________________________

Yeah

Nostr event nevent1qqsr3clzw2wak7e2lhadjzrgvx8cjc2vkpkfc44yd9m0g8m9g0lfecgzypnxw52cucecl6ylmfqcus4qhu4852cny5zd6drlq9dp39cmv3zrqjsxyjl

2026-03-21T12:04:35Z

how dare you

If this gets merged I'll soft fork arch with the only change ...

2026-03-19T22:34:33Z

In reply to nevent1q…yxpq
_________________________

If this gets merged I'll soft fork arch with the only change being that I'll remove this.

Actually maybe this may be the final nail in the coffin to get me to move to Gentoo, of a BSD, or go back to NixOS

Doom over marmot!! #naddr1qq…s2ug

2026-03-19T09:30:18Z

Doom over marmot!!

quoting
naddr1qq…s2ug

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

At 40T we're having a party

2026-03-18T17:40:10Z

In reply to nevent1q…mq3w
_________________________

At 40T we're having a party

The real github status page, 90.82% uptime in the last 90 days ...

2026-03-17T17:55:46Z

The real github status page, 90.82% uptime in the last 90 days

https://mrshu.github.io/github-statuses/

| file | use | | -----------|----------------------------| | ...

2026-03-16T15:02:29Z

In reply to nevent1q…7qgf
_________________________

| file | use |
| -----------|----------------------------|
| data.n | BASED blobs |
| index.o | offset index |
| tags.s | single-letter tag index |
| dtags.t | tagged-addressable index |
| vanished.r | removed pubkeys |

Nostr event nevent1qqsdkfjhtuqw5edjrldxglc0c76yegmsvtgwkr724er97azy9f04e9qzypnxw52cucecl6ylmfqcus4qhu4852cny5zd6drlq9dp39cmv3zrq4mn7xt

2026-03-16T14:43:08Z

**B**inary **A**ppend **S**tore for **E**vent **D**ata.

@npub1q3s…d26p implemented my new favorite feature of any nostr ...

2026-03-14T08:21:21Z

Alex Gleason (npub1q3s…d26p) implemented my new favorite feature of any nostr client!! Emoji masking of profile pictures

Afterall, why shouldn't my nostr profile picture have the shape of the ghost emoji?

wait, you implemented it as emoji masking?? you're a madman I ...

2026-03-14T08:15:58Z

In reply to nevent1q…uudq
_________________________

wait, you implemented it as emoji masking?? you're a madman I LOVE THIS

if you had better shapes, like a squircle

2026-03-14T08:13:16Z

In reply to nevent1q…lmyg
_________________________

if you had better shapes, like a squircle

I've been building freedom tools for years now, but I still ...

2026-03-13T09:16:13Z

I've been building freedom tools for years now, but I still haven't been able go convince my family to care about any of it...

Being cypherpunks is weird

Sometimes I feel like our efforts are for nothing...

What about NIP-4E and NIP-17E do you think I misunderstood?

2026-03-11T11:45:22Z

In reply to nevent1q…s7af
_________________________

What about NIP-4E and NIP-17E do you think I misunderstood?

Nostr event nevent1qqs256xmue8pdn9w2ntd0putmhcnt6zscdklcqzghq8l5l5jmuf2tlqzypnxw52cucecl6ylmfqcus4qhu4852cny5zd6drlq9dp39cmv3zrqukpwnu

2026-03-11T11:29:21Z

...... we have failed as devs

I don't understand the benefits of this over marmot protocol. ...

2026-03-11T09:47:39Z

In reply to nevent1q…62ys
_________________________

I don't understand the benefits of this over marmot protocol.

https://github.com/marmot-protocol/marmot

4-6... 7 I'll eat... I guess... Anything below 4 is raw imo

2026-03-09T13:22:18Z

In reply to nevent1q…4hgp
_________________________

4-6... 7 I'll eat... I guess... Anything below 4 is raw imo

I meant more like showing them the coins afterwards to show why ...

2026-03-08T14:36:35Z

In reply to nevent1q…jtvq
_________________________

I meant more like showing them the coins afterwards to show *why* this is the case

Well deserved 😃

2026-03-08T14:35:19Z

In reply to nevent1q…7ze5
_________________________

Well deserved 😃

The only thing I can think of is showing the user their coins in ...

2026-03-08T14:26:40Z

In reply to nevent1q…4945
_________________________

The only thing I can think of is showing the user their coins in some way that way they can see visually that they just don't have the coins to make 75

Over those we have some advantages, but I'll be honest with ...

2026-03-08T14:15:49Z

In reply to nevent1q…aqyx
_________________________

Over those we have some advantages, but I'll be honest with you, there's still a lot of work to be done... (multi device for example is gonna be a huge add), and for now they have some advantages over whitenoise (mostly that they're more mature)

Better than telegram:

- Nothing is hidden, the entire code end to end is opensource
- No central servers, we cannot be compelled by law to release information, because we literally do not have it

Better than bitchat:

- We have MLS, which provides forwards and backwards secrecy

Better than simplex:

- We're not associated with a shitcoin (flux)
- We are nostr native

But most important of all, we are an open protocol, one that gets improved over time, and one that anyone can contribute to, and implement if they have the technical ability, https://github.com/marmot-protocol/marmot

You don't need to ask for our permission, just build it, like the people behind VectorPrivacy (nprofile…5jp4) and https://github.com/sledtools/pika have!

The correct repo for the cli is whitenoise-rs. Not whitenoise; ...

2026-03-08T14:00:42Z

In reply to nevent1q…j8xw
_________________________

The correct repo for the cli is whitenoise-rs. Not whitenoise; whitenoise is the flutter app

https://github.com/marmot-protocol/whitenoise-rs

I don't think that people who don't know how cashu works ...

2026-03-08T08:21:36Z

In reply to nevent1q…64r9
_________________________

I don't think that people who don't know how cashu works would understand why 75 is not round but 72 and 76 are

To be fair this is Snowden we're talking about, I don't ...

2026-03-08T08:19:23Z

In reply to nevent1q…dk50
_________________________

To be fair this is Snowden we're talking about, I don't think HODL minds

Linux has some ways to securely store keys in the kernel, this ...

2026-03-08T07:42:46Z

In reply to nevent1q…9zgm
_________________________

Linux has some ways to securely store keys in the kernel, this initializes it

We should talk to the @nprofile…p4dj guys about making an iOS ...

2026-03-07T17:34:27Z

In reply to nevent1q…4hp9
_________________________

We should talk to the Zapstore (nprofile…p4dj) guys about making an iOS app store too, now that apple is forced to allow alternative stores... Of course the better solution would be to convince iOS users to move to a good Android rom but.... Ain't gonna happen

I'll help you improve it a bit. This is a good idea but needs ...

2026-03-07T17:29:37Z

In reply to nevent1q…9x4n
_________________________

I'll help you improve it a bit. This is a good idea but needs work

Why do you think that's better exactly?

2026-03-07T17:25:38Z

In reply to nevent1q…9xc7
_________________________

Why do you think that's better exactly?

Put up a PR to improve that messaging. also please check keyctl ...

2026-03-07T10:00:56Z

In reply to nevent1q…9582
_________________________

Put up a PR to improve that messaging. also please check keyctl session too before installing libsecret, forgot that were using keyctl for headless

sudo apt install gnome-keyring libsecret-tools dbus-x11 export ...

2026-03-07T07:08:39Z

In reply to nevent1q…x0rs
_________________________

sudo apt install gnome-keyring libsecret-tools dbus-x11
export $(dbus-launch)
echo "" | gnome-keyring-daemon --unlock
export $(gnome-keyring-daemon --start --components=secrets)

If this doesn't work please let me or javier know. I think we need to make the messaging better in this case, I might make a PR for that either layer today or Monday.

OK, in that case please make sure you have a libsecret keyring ...

2026-03-07T06:57:36Z

In reply to nevent1q…uast
_________________________

OK, in that case please make sure you have a libsecret keyring installed and the dbus service for it is started.

We're working really hard on getting it to a better state! ...

2026-03-06T20:53:02Z

In reply to nevent1q…kwws
_________________________

We're working really hard on getting it to a better state! The plans are bigger than you can imagine 🦫, but they take time

By tomorrow its gonna be 10x better. Hzrd's dev speed is ...

2026-03-06T15:57:20Z

In reply to nevent1q…gvzp
_________________________

By tomorrow its gonna be 10x better. Hzrd's dev speed is insane

What OS are you using?

2026-03-06T15:47:11Z

In reply to nevent1q…f2ep
_________________________

What OS are you using?

Its whitenoise-rs, also it got merged to master so you don't ...

2026-03-06T15:37:25Z

In reply to nevent1q…nf4u
_________________________

Its whitenoise-rs, also it got merged to master so you don't need to checkout any other branch

He shouldn't be able to see the dev logs, that's only for ...

2026-03-06T15:31:18Z

In reply to nevent1q…50w9
_________________________

He shouldn't be able to see the dev logs, that's only for the staging builds

This is a known bug, fix coming soon™

2026-03-05T21:55:23Z

In reply to nevent1q…k8zx
_________________________

This is a known bug, fix coming soon™

Try and message me

2026-03-05T21:54:10Z

In reply to nevent1q…skr5
_________________________

Try and message me

I don't think so? Unless it was fixed during my flight to Sao ...

2026-03-05T21:33:25Z

In reply to nevent1q…lfqr
_________________________

I don't think so? Unless it was fixed during my flight to Sao Paulo

Whoops yeah that's what I meant

2026-03-05T21:32:55Z

In reply to nevent1q…evwx
_________________________

Whoops yeah that's what I meant

0.3.0 is not the latest, that would be 0.3.5

2026-03-05T21:22:02Z

In reply to nevent1q…2l7u
_________________________

0.3.0 is not the latest, that would be 0.3.5

This is a known bug, we'll fix it soon (TM)

2026-03-05T21:21:18Z

In reply to nevent1q…zfa0
_________________________

This is a known bug, we'll fix it soon (TM)

commits addressing coderabbit's comments are officially ...

2026-03-04T16:14:53Z

commits addressing coderabbit's comments are officially called carrots; don't care what anyone thinks, it's just science

The point that he was making is that there's no way someone ...

2026-03-01T09:39:47Z

In reply to nevent1q…47nr
_________________________

The point that he was making is that there's no way someone will vibe a product as complex as blender.

We were just experimenting with breaking nip17

2026-02-28T00:53:00Z

In reply to nevent1q…yz54
_________________________

We were just experimenting with breaking nip17

@nprofile…evew destroyed my DMs, they're full of this stuff ...

2026-02-27T23:50:26Z

hzrd149 (nprofile…evew) destroyed my DMs, they're full of this stuff 😥

do you happen to have primal installed on your phone? on android ...

2026-02-26T10:59:12Z

In reply to nevent1q…yynl
_________________________

do you happen to have primal installed on your phone?

on android primal implements the same nip-55 spec as amber if I remember correctly

True, but I think we have swung too much the other way, where ...

2026-02-25T23:17:01Z

In reply to nevent1q…uv55
_________________________

True, but I think we have swung too much the other way, where people have completely thrown away thinking

Who's going to BTC++ in floripa tomorrow? #btcpp

2026-02-25T22:02:32Z

Who's going to BTC++ in floripa tomorrow?

#btcpp

Nutella is so terrible in comparison, the two can't even stay ...

2026-02-25T19:35:57Z

In reply to nevent1q…7yzc
_________________________

Nutella is so terrible in comparison, the two can't even stay in the same place.

I didn't say that I should get anything for free lol i ...

2026-02-25T19:30:27Z

In reply to nevent1q…s405
_________________________

I didn't say that I should get anything for free lol i believe in paying for tech, and have donated money to many open-source projects I use... Just because something is open-source doesn't mean it's free

Having the code != getting it for free

Of course! They used to be in the 80s, we only changed that ...

2026-02-25T19:21:03Z

In reply to nevent1q…6qst
_________________________

Of course! They used to be in the 80s, we only changed that because of convenience.

* should have closed source code

2026-02-25T18:24:29Z

In reply to nevent1q…n7cv
_________________________

* should have closed source code

So the solution to other companies having bad open code is ...

2026-02-25T18:24:08Z

In reply to nevent1q…shuc
_________________________

So the solution to other companies having bad open code is half-bad closed code?

It doesn't make sense to me. There's no reason why any software should have non closed source code

if you want your startup to fail right away, that's true

2026-02-25T16:48:02Z

In reply to nevent1q…mfn0
_________________________

if you want your startup to fail right away, that's true

by that logic, what's the point of closed source? at least if ...

2026-02-25T16:45:36Z

In reply to nevent1q…rx4x
_________________________

by that logic, what's the point of closed source? at least if the code is open (and well written) I can know what I'm running on my machine

Prime is one of the few voices of reason when it comes to ai

2026-02-25T14:52:34Z

In reply to nevent1q…amsw
_________________________

Prime is one of the few voices of reason when it comes to ai

How dare you see what is right in front of your eyes

2026-02-25T13:12:56Z

In reply to nevent1q…qlvh
_________________________

How dare you see what is right in front of your eyes

It's crazy that we've gotten at a point in society where ...

2026-02-25T12:10:15Z

In reply to nevent1q…qj3s
_________________________

It's crazy that we've gotten at a point in society where questioning anything makes you the weird one...

That's what the government does man

2026-02-24T06:46:11Z

In reply to nevent1q…dpus
_________________________

That's what the government does man

Nostr event nevent1qqsf8w48yl6z0nhk8p3mshz7veeykn3cefnl2mqxyl09lxkgxasr7uqzypnxw52cucecl6ylmfqcus4qhu4852cny5zd6drlq9dp39cmv3zrqttv7n8

2026-02-24T05:03:38Z

Flying at 6am is the worst

I'll make the repo public once we get it to a better state, ...

2026-02-22T14:54:20Z

In reply to nevent1q…a2u9
_________________________

I'll make the repo public once we get it to a better state, and we'll eventually move it to a subdomain on whitenoise.chat or maybe a subfolder or something

I mean in a way, but he doesn't fight, he runs a diagnosis on ...

2026-02-22T09:51:12Z

In reply to nevent1q…qzm5
_________________________

I mean in a way, but he doesn't fight, he runs a diagnosis on your nostr profile, and then provides you with ways to fix it

Somewhere in the web mess above

2026-02-22T09:45:46Z

In reply to nevent1q…gs2k
_________________________

Somewhere in the web mess above

OMG Can I steal this image? would work amazingly for an ...

2026-02-22T09:38:18Z

In reply to nevent1q…ucfu
_________________________

OMG Can I steal this image? would work amazingly for an in-between slide in my btc++ presentation

presenting doctor marmot ...

2026-02-21T07:57:12Z

presenting doctor marmot

coming soon (no seriously, this is real)