bnewbold

Cryptography in atproto and did:plc

Public key cryptography is used in several aspects of atproto ("AT Protocol"). This short, informal, not-very-official document clarifies some details of which specific systems, keys, serialization formats, and signing/verification procedures are used.

For folks who are already familiar with atproto, the quick things to note are:

• yes, it is expected for everybody to support two curve types
• take the SHA-256 hash of repo commit nodes before signing/verifying them
• depending on library/language used, p256 may have quirks with "compressed" encoding
• yes, DID documents do require two similar-but-different encodings for public keys (did:web and multibase)

IanColdwater

Mute these words in your settings here: https://twitter.com/settings/muted_keywords

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troyane

#!/bin/bash

#
# Script to convert MP4 video to GIF with generation of custom color palette.
#
#=== Do not touch code below
# Inner variables
input_file=""
input_fps="20"
input_height="512"

tylerneylon

license: mit

ingramchen

### Full command line options

```
ffmpeg -f gif -i FOO.gif -pix_fmt yuv420p -c:v libx264 -movflags +faststart -filter:v crop='floor(in_w/2)*2:floor(in_h/2)*2' BAR.mp4
```

### Notie

 * output mp4 is encoded with h264, support Firefox/Chrome/Safari in Windows, Mac OSX, Android, and iOS.

Vestride

Encoding Video

Installing

Install FFmpeg with homebrew. You'll need to install it with a couple flags for webm and the AAC audio codec.

brew install ffmpeg --with-libvpx --with-libvorbis --with-fdk-aac --with-opus