Can Nostr Events be Manipulated?

 Posted on Tuesday, April 18, 2023, 08:00 AM  |  nessy

If you haven’t been following along, I have a couple of nostr posts at this point. https://nessy.info/tags/nostr/ I’ve been trying to further understand nostr by deep diving the protocol. At this point my thought is how mutable are nostr messages (events), I understand that during broadcast the relay verifies the signature, but then they need to store these events in some centralized database, right? Could a rogue relay for example accept your event, then alter it at a later time?
Cryptography  Nostr  nostr-rs-relay  sqlite 

Simple Tools for Interacting with the Nostr Protocol

 Posted on Monday, April 17, 2023, 08:00 AM  |  nessy

If you haven’t had a chance to ready my previous post about nostr, it is probably worth checking out as it give a detailed, step by step explanation. https://nessy.info/post/2023-02-16-deciphering-nostr-and-its-private-keys/ With knowledge gained from the previous post I decided to put together a couple of rough python scripts, this is to handle a few of our previously manual steps. Head on over to my Github and check out my nostr_stuff repository:
Python  Cryptography  Nostr  openssl 

Simple CLI for Categorizing and Sentiment of Text

 Posted on Saturday, April 15, 2023, 08:00 AM  |  nessy

Now that I’ve spent some time with huggingface.co, specifically their NPL Course (natural language processing) I wanted to combine a couple of the learnings into a simple python script. What I ended up with was a script that could both categorize using a zero-shot-classification model, as well as get sentiment using a sentiment-analysis model. You can interact with this script in one of two ways, first by sending a string as input during execution:
Python  AI  Large Language Models  Hugging Face  Transformers 

Early Exploration of Large Language Models on Python

 Posted on Friday, April 14, 2023, 08:00 AM  |  nessy

With the current hype on artificial intelligence and platforms like OpenAI’s ChatGPT, I decided it’s about time I explore. I’m not going to lie, I’m not exactly excited about a company named OpenAI being a closed source, for profit platform; however, this has been one of the reason I decided to explore offline, open, and self hosted solutions (in the hopes of creating my own models). If you recall I’ve experimented with python and machine learning in the past, look no further than my 2016 Test your machine learning blog post.
Python  AI  Large Language Models  Hugging Face 

Kubernetes Raspberry Pi Lab Environment Setup Using Ansible

 Posted on Tuesday, April 4, 2023, 08:00 AM  |  nessy

After manually setting up a Lightweight Kubernetes cluster on a few of my Raspberry Pi’s I decided to tear it all down, and rebuild it from scratch using Ansible, and an infrastructure as code strategy. This gives me a chance to catchup a bit on ansible, and keep my documentation and notes for this project in a replay-able Github repository. The project at the moment is rough, and contains sensitive details; however, this is a local lab environment that will most likely be trashed later on, so I’m not worried.
K3S  Kubernetes  Raspberry Pi  Ansible 

Raspberry Pi Kubernetes Cluster

 Posted on Thursday, March 16, 2023, 08:00 AM  |  nessy

I figured now the perfect time for me to explore the lightweight Kubernetes project k3s. The documentation was really solid, plus I found Alex Ortner’s Medium blog post very helpful. I dusted of a Raspberry Pi 4, and three Raspberry Pi 3’s for this setup. I’m still in the mists of my kubernetes journey, but I wanted to share some of the early primitives, and some of the notes I’ve written for myself.
K3S  Kubernetes  Raspberry Pi 

Deciphering Nostr and it's private keys

 Posted on Saturday, January 21, 2023, 08:00 AM  |  nessy

I’ve heard of https://nostr.com for about a year, but not until recently have I experimenting with it. This post consists of my rough notes as I progressed to sending a nostr message. If you are interested in a bare minimum way to post events to nostr, read on. Generate a new private key $ openssl ecparam -name secp256k1 -genkey -out ec-priv.pem The output here as the file extension notes is PEM:
Development  Nostr  openssl  cryptography  python  websockets 

Raspberry Pi Pico Wireless & CircuitPython

 Posted on Sunday, November 27, 2022, 08:00 AM  |  nessy

Was lucky enough to get my hands on a couple Raspberry Pi Pico W recently, and just finished up initial exploration. I started with a by flashing the CircuitPython .UT2 to the pico, like always Adafruit has a phenomenal write up on just that. Next I added copied in modules from the 8.x bundle, simply toss the following into your pico’s /lib/ directory: $ ls -1 /Volumes/CIRCUITPY boot_out.txt code.py lib $ ls -1 /Volumes/CIRCUITPY/lib/ adafruit_httpserver.
Development  Raspberry  Wireless 

Raspberry Pi Pico and 433MHz Data Radio

 Posted on Monday, March 14, 2022, 11:39 AM  |  nessy

Well its been a minute since I’ve toyed around with electronics, but a $4 Raspberry Pi Pico board arriving in the mail changed that. This board packs a boat load of utility for $4, just check out the data sheet and check out all them I2C and SPI pins! I dusted off the last components I tinkered with, along with a handful of wires. After a couple days of tinkering, I ended up with a 433MHz radio packet receiver.
Development  Raspberry  Radio  Wireless