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chaintuts.bsky.social
chaintuts
@chaintuts.bsky.social
160 followers 190 following 190 posts
Explaining computer science for everyone! Run by Josh McIntyre - Full timer at Microsoft PGH, tech educator @chaintuts👨‍🏫💻

Active adventurer / rocker climber / jiu jitsu nerd.

PGP: 1DC3 1720 441B 9945 C51F

chaintuts.com
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chaintuts.bsky.social
chaintuts @chaintuts.bsky.social · Apr 21
Free and open licensed tech education content:

Book: www.amazon.com/dp/B0F47FMHPK
Book free: github.com/chaintuts/cr...
Videos: youtube.com/c/chaintuts
Articles: github.com/chaintuts/articles
Code: github.com/chaintuts

#learning
#cybersecurity
#computerscience
#opensource
chaintuts.bsky.social
I'm excited to share I'll be speaking at the Hackers Guild PGH 2025 Guild Con next Saturday, Nov 22. I'll be covering Cryptography for Hackers and Engineers, an all-level introduction to the cryptography we use every day!

#cryptography
#hackersguild
#techeducation
November 16, 2025 at 12:07 AM
chaintuts.bsky.social
Occasional bedroom (office?) musician off and on since I was a kid. I've been enjoying playing this indoor cozy season.

#guitar
#bass
A 5 string Squier Jazz Bass and Epiphone SG sitting on a chair A 5 string Squier Jazz Bass, Epiphone Sg, Yamaha F325 acoustic leaning on the office wall A 5 string Squier Jazz Bass, Epiphone Sg, Yamaha F325 acoustic, Epoch LP4, and Dean Edge 9 leaning on the office wall A Hartke bass Amp with Boss super overdrive and Nux tuner pedal
November 16, 2025 at 12:05 AM
chaintuts.bsky.social
Some more recent climbing adventures. Working on lead head and confidence has been helpful.

#climbing
A climber twisting their hips on a 5.10c vertical route. A climber stepping on a 5.10a lead. A climber working up an overhanging lead wall. A climber pulling on a 5.10a vertical route.
November 15, 2025 at 11:55 PM
chaintuts.bsky.social
31 laps around the sun! Got to climb all weekend with my favorite people and some solo too. Grateful to be surrounded by such good people and do the things I enjoy.

#Climbing
Two climbers, husband and wife enjoying a day at Ascend Climbing Gym. Two climbers friends at Climb North gym. Climbing a tall, reachy 5.10d route on autobelay, mangling off a volume. A climber mantling on a fun dihedral boulder problem.
October 13, 2025 at 11:41 PM
chaintuts.bsky.social
If you're missing some words from your crypto seed phrase, is recovery possible? Well...maybe. Learn the math of seed word recovery with my free and open tutorial!

youtube.com/shorts/pM5a1...

#security
#crypto
#cryptography
Missing Seed Word Math — Is Recovery Possible? #security #crypto #shorts
YouTube video by chaintuts
youtube.com
October 5, 2025 at 10:55 PM
chaintuts.bsky.social
Had a crazy busy week but at least I got to climb! Sent this purple 5.8 clean finally and tried another 5.10a.

#Climbing
#ascendclimbing
#pittsburghclimbing
October 5, 2025 at 5:35 PM
chaintuts.bsky.social
#bjj
A tired BJJ purple belt taking a selfie after class
October 5, 2025 at 5:34 PM
chaintuts.bsky.social
A fun morning session with my friend Katelyn! Dipping into 5.10a again on lead and one hang finishing a fun 5.8 on the arete.

#climbing
A lead climber working up an arete climb A lead climber clipping on a slightly overhanging, reachy route A leader and belayer Taking a fall on lead
September 28, 2025 at 10:13 PM
chaintuts.bsky.social
Some beautiful hiking and mountain biking weather
A hiker taking a selfie on the Rachel Carson trail A mountain biker jumping off an angled rock
September 28, 2025 at 10:10 PM
chaintuts.bsky.social
Stepping up on a harder top rope solo Pulling on two nice crimps on top rope solo Higher on the route while top rope soloing, hanging off a nice set of holds.
September 28, 2025 at 10:09 PM
chaintuts.bsky.social
Some action shots from a top rope solo session today. A few laps outside at Seldom Seen then the Climb North adult social in the evening!

#Climbing
#pittsburghclimbing
#topropesolo
A top rope solo climber stepping up, pulling on a crimp on a 5.9 route A top rope solo climber pulling on crimps/side pull crimp working up a route A top rope solo climber working up the middle of a route
September 21, 2025 at 12:09 AM
chaintuts.bsky.social
Great evening climbs with Ben. First lead attempts on this 5.9 project, which I've top rope soloed. Felt smooth through the first 3 bolts 😊 then TRS to clean the draws.
Crimping the early part of a 5.9 route on lead. Stepping up around the 3rd bolt. A top down photo of a climber top rope soloing a route A top down photo of a climber top rope soloing, about to clip in to the anchor with a PAS
September 19, 2025 at 3:37 AM
chaintuts.bsky.social
More goodies from Seldom Seen this week. Climbed my favorite 5.9 clean on top rope solo. Fresh bolt hangars after the old one's went missing...

Happy place for sure!

#Climbing
#pittsburghclimbing
A climber selfie on top rope solo A two strand top rope solo setup on a sandstone retaining wall. A selfie at the top of a route on top rope solo A train passing by on the bridge above the climbing routes
September 16, 2025 at 1:10 AM
chaintuts.bsky.social
A hike and rappel practice on some low angle (but steep enough) terrain at North Park.

#rappelling
#hiking
A selfie while rappelling A selfie while hiking An extended rappel setup with third hand A steep section of woods and rocks
September 13, 2025 at 1:44 PM
chaintuts.bsky.social
Top rope soloing at Seldom Seen Greenway, with some new gear from Avant Climbing and HowNot2 that made the experience even smoother.

#Climbing
#topropesolo
Top rope soloing a corner Top rope soloing a corner Top rope soloing a corner Chalking up top rope soloing a corner
September 13, 2025 at 1:41 PM
chaintuts.bsky.social
Life is short hug your friends (aggressively).

#bjj
Mount arm triangle choke Scissor sweep Knee cut pass
September 13, 2025 at 1:36 PM
chaintuts.bsky.social
Climbing, mountain biking, strength training. Joyful movement.
A lead climber backstepping on a slabby gym route A lead climber moving at the second bolt A lead climber clipping the second bolt on an overhang route A climber taking a lead fall with belayer giving a soft catch
August 29, 2025 at 2:33 AM
chaintuts.bsky.social
Top rope solo climbing laps at Seldom Seen! Great way to start off the day.
A top rope solo climber at the anchor, showing the figure 8 and two strand setup with the selfie.
August 25, 2025 at 1:15 AM
chaintuts.bsky.social
A fantastic seminar with Sinistro last week. And my teammate Andy earned his black belt!

#bjj
August 25, 2025 at 1:13 AM
chaintuts.bsky.social
Adventures from the last few weeks
A mountain biker on a wooden drop A mountain biker on a rock roll Another top rope solo corner climb A top rope solo climber climbing a corner
August 15, 2025 at 8:31 PM
chaintuts.bsky.social
Can you recover missing crypto seed words? How many words can be missing before recovery becomes impractical — or impossible? Find out with my latest free and open license tutorial!

📺 youtu.be/R9IP5dLghzA
📖 books2read.com/digitalsovereignty

#crypto #security #seedphrase
Cracking Missing Seed Words – Is It Possible?
YouTube video by chaintuts
youtu.be
August 6, 2025 at 2:46 PM
chaintuts.bsky.social
The chaintuts YouTube channel reached 1000 subscribers this weekend.Thank you for sharing in this journey of learning and open knowledge with me! It's been a great 6.5 years of building free and open education content — more to come!

youtube.com/shorts/jg_xw...

📖 books2read.com/digitalsovereignty
chaintuts 1000 Subscriber Thank You!
YouTube video by chaintuts
youtube.com
July 29, 2025 at 9:42 PM
chaintuts.bsky.social
SeedWordSmith is a tool for calculating the combinations and time estimates needed to crack or recover missing seed words! This educational demo visualizes the overall feasibility of recovery. Unit tests aided by Copilot :)

github.com/chaintuts/se...

#coding #cybersecurity #copilot
GitHub - chaintuts/seedwordsmith: SeedWordSmith calculates combinations and time estimates for cracking missing seed words
SeedWordSmith calculates combinations and time estimates for cracking missing seed words - chaintuts/seedwordsmith
github.com
July 26, 2025 at 8:27 PM
chaintuts.bsky.social
Offline wallets, offline backups. Discover cold wallet security strategies with chaintuts!

📺 youtube.com/c/chaintuts
📖 books2read.com/digitalsovereignty

youtube.com/shorts/Iv-Sv...
Offline Wallets, Offline Backups - The Cold Wallet Security Model #shorts #crypto #cybersecurity
YouTube video by chaintuts
youtube.com
July 19, 2025 at 4:17 PM
chaintuts.bsky.social
Thankful for the opportunity to join the Smart Economy Podcast to chat about all things crypto security! We discuss:

🔐 How to build a security plan around your personal threat model
🧠 Why security isn’t just about tech; it’s about human behavior

www.smarteconomypodcast.com/crypto-secur...
Crypto Security: Building Open Source Education for Blockchain
In this episode of The Smart Economy Podcast, host Dylan Grabowski is joined by Josh McIntyre, Chairperson of the CCE Committee at C4, a non-profit organization adv…
www.smarteconomypodcast.com
July 17, 2025 at 1:44 PM