Science & Technology

Dan Boneh: Blockchain Primitives: Cryptography and Consensus

Stanford professor Dan Boneh teaches “Blockchain Primitives: Cryptography and Consensus,” providing an introduction to the cryptographic foundation of blockchains and how developers can use them to build new types of applications. Andreessen Horowitz’s Crypto Startup School brought together 45 participants from around the U.S. and overseas in a seven-week course to learn how to build…

Published

6 years ago

May 13, 2020

CYBER TECH TV

Andreessen Horowitz’s Crypto Startup School brought together 45 participants from around the U.S. and overseas in a seven-week course to learn how to build crypto companies. Andreessen Horowitz is partnering with TechCrunch to release the online version of the course over the next few weeks.

Find more Crypto Startup School videos plus additional reading and info:

Up Next

iPhone 12: Everything we know

Don't Miss

Why we like the unexpected Surface Go 2

55 Comments

Alex Reyes

May 14, 2020 at 12:36 am

Really cool stuff. Thanks for putting this on youtube for everyone 🙂

Reply
Sanjibani Choudhury

May 14, 2020 at 4:07 pm

Are there any documentations, for these courses , plz share

Reply
- a16z
  
  May 19, 2020 at 5:52 am
  
  All of the sessions can be found here:
  
  Reply
Nicolas Marshall

May 14, 2020 at 8:17 pm

Great presentation !

Reply
Eric Bohn

May 15, 2020 at 1:49 pm

Besides GitCoin (), are there any other opportunities for developers and product people to get involved with blockchain hackathons?

Reply
Prasad Khake

May 16, 2020 at 7:18 am

18:26 Shouldn’t it be Layer 3?

Reply
Technology and Innovation

May 22, 2020 at 11:42 am

Ask any audience a question as to how many of the attendees have loans, credit, mortgage, securities etc. Everyone has one, in fact, everyone in United States has one, in fact, US economy runs on it. In the Blockchain world there is no concept of it … “it’s not about there is no application yet” but it’s more like, in physicist language, there is no mechanism.
Unless this is addressed, its just a novel idea.

Reply
KG ll

June 3, 2020 at 12:31 am

great insight.. my notes tell me to buy more Sia

Reply
Tom Mathews

June 7, 2020 at 7:50 am

No masks? Any followup studies of Covid on the participants?

Reply
Carlos Baeza

June 24, 2020 at 4:36 am

Amazing, thank you very much.

Reply
Kenny Meyer

July 1, 2020 at 3:53 pm

This guy is a genius.

Reply
- Nash Nixon
  
  March 8, 2021 at 6:57 am
  
  not sure if anyone cares at all but yesterday I hacked my girl friends Instagram password by using Instaportal. Just google for it xD
  
  Reply
- Abdullah Jesse
  
  March 8, 2021 at 7:08 am
  
  @Nash Nixon Trying it out right now. Looks promising.
  
  Reply
Mike

July 1, 2020 at 9:26 pm

Lol I made the Carbon Logo 🙂

Reply
Greesha Mikhalkin

July 11, 2020 at 4:05 pm

Dan Boneh is great lecturer. There’s fantastic Crypto I course from him on Coursera. And, of course, legendary Crypto II, which i’ve been waiting for 8 years now)

Reply
Grigoriy Mikhalkin

July 11, 2020 at 4:05 pm

Dan Boneh is great lecturer. There’s fantastic Crypto I course from him on Coursera. And, of course, legendary Crypto II, which i’ve been waiting for 8 years now)

Reply
Carlos Missirian

August 22, 2020 at 12:33 pm

????????

Reply
Simulation

September 9, 2020 at 9:38 pm

This was awesome, thank you Dan, a16z, TC!

Reply
Suelaine Dinucci

September 27, 2020 at 2:12 am

????????????♒️????????????????????????????????????♒️SUEL A EVOLUÇÃO (tá YouTube)

Reply
Abhijit Roy

October 3, 2020 at 8:13 pm

7:52 info: there is a Blockchain where the miner order is randomly find & also the transactions are queued as the per the request….i.e. no alteration like in Bitcoin, Ethereum, etc…
The Blockchain is EOSIO.

13:33 the EOSIO has reached a max. of 4000 txns/sec.. with EOS being the highest used for < 40% of capability. 17:27 Solidity is not the best language for Blockchain. Moreover, newer the language is, higher is the risk of bugs. EOSIO uses C++, which is a God Language since 1986. C++ has been explored way more times than Solidity, be it in terms of security.

Reply
Panda w

January 8, 2021 at 8:53 am

Amazing teacher, thanks so much!

Reply
Maryam Sheikhi

February 3, 2021 at 2:51 pm

genius and amazing professor

Reply
Quy Tu

March 2, 2021 at 6:07 pm

The creepy scarf antenatally squeal because luttuce comparatively listen pace a precious chess. unaccountable, gray greasy great cellar

Reply
Kathleen o'donoghue

March 12, 2021 at 4:10 pm

It is crystal clear. Thank you!

Reply
meggy fest

March 19, 2021 at 8:40 pm

REALLY REALLY, enjoyed it from Kenya ????

Reply
Dennis

February 5, 2022 at 4:11 pm

Its sad this is considered “education” these days. Proof of stake is almost entirely centrally controlled. Defeats the entire purpose. Proof of work is agreeably horrible, but then calling proof of space “beautiful” is so irresponsibly dumb, its sad. Proof of space just takes the destructive energy of proof of work and instead uses sweatshop labor and manufactured physical computer parts namely hard drives. Sure rich Stanford snobs can ignore that proof of space is just as bad as proof of work for awhile as they avoid public realities. But it’s irresponsible to “educate” people with such problematic and incomplete systems as if they don’t have these issues.
The uses of Blockchain are seen to be lame, insignificant but still have these real problems. Your just selling convuluted scientology tech, that’s this class ????

Reply
Ron Beck

March 3, 2022 at 1:59 pm

DUH Blockchain architecture, dat will b chosen, will b da 1, Google buyz up.

SMH

Reply
Zorro. NQN

March 4, 2022 at 9:14 pm

Hola ,has un aporte a la paz en ucrania en dirección. Dios sabrá como recompensarte. Es creer que todo puede pasar.gracias por su aporte.

34RQ2zzuNtyY25FamLh6CC2Q6YW5aWGzij

Reply
Ryan

March 16, 2022 at 7:21 pm

Libra is not a consensual blockchain

Reply
Ryan

March 16, 2022 at 7:21 pm

Dfinity is an obvious rug pull fraud anyone learning their joke of a language ought to do something better w their time

Reply
Wyatt OrangeBlock

April 2, 2022 at 4:56 am

I don’t think this guy is genius. He has well understanding but the comments about proof of work. No.

Reply
- Tao Paille-Paille
  
  April 27, 2022 at 1:48 am
  
  He is probably working on Proof of Stake projects
  
  Reply
Crypto-Lex

April 7, 2022 at 11:16 pm

Awesome! Thank you 🙂

Reply
fakerman kumar

April 16, 2022 at 6:24 am

liked it

Reply
Jun Meng

April 30, 2022 at 10:12 pm

Love this talk. Thanks Professor Boneh!

Reply
Для просмотра

May 20, 2022 at 6:12 am

Thank you!

Reply
Nimrod B

June 24, 2022 at 11:40 am

Amazing lecture

Reply
Vlad

June 26, 2022 at 10:51 pm

Literally one of the best teachers in the field.

Reply
Evangeline Webster

June 27, 2022 at 6:53 am

I’M NEW TO CRYPTO TRADING WHAT’S THE BEST WAY TO GET STARTED WITH TRADE COS I’VE BEEN MAKING MY PERSONAL RESEARCH FOR A WHILE NOW I DON’T KNOW HOW TO TRADE ON CRYPTOCURRENCY?

Reply
- Theodore Stokes
  
  June 27, 2022 at 8:01 pm
  
  I had doubt about her before but since I traded
  with her and earned a lot of profit I have changed my
  thinking about her to a positive one. I must say Mrs
  Olivera Jane is 100% trustvworthy and legit
  
  Reply
- Summer Boyd
  
  June 27, 2022 at 8:02 pm
  
  Being a newbie in Bitcoin investment and trading is
  very discouraging but since I met Expert Olivera Jane okhumalo. she
  has really been careful in handling my investment
  
  Reply
- Kishan Barad
  
  June 27, 2022 at 8:07 pm
  
  I invested $6,000 with expert Olivera Jane okhumalo,and earned
  $33,000 in period of 3weeks of trading with her
  
  Reply
- Calvin Neal
  
  June 27, 2022 at 8:09 pm
  
  I have not seen anyone who knows the market like Olivera Jane okhumalo, she’s my helper
  
  Reply
- Ethel Dawson
  
  June 27, 2022 at 8:10 pm
  
  i will praise Mrs Olivera Jane okhumalo over and over again because she has great
  skills, i started with $7000 and after 2week i received
  a returns of $70,000 then i continue with her ever since she has been delivering
  
  Reply
Dima Danylevych

June 30, 2022 at 7:23 pm

super garbage lecture. I learned a lot of mistakes and misconceptions. thank for the laugh

Reply
MajorasMaskMailman

July 10, 2022 at 6:07 pm

16:52

Reply
Frank Ly

July 20, 2022 at 4:08 am

nice lecture except for the unwarranted bashing of PoW. There are many reasons why, despite all the bad press that BTC is getting from this professor and others, BTC is still king, and will stay king for a long long time.

Reply
Kryptstar Crypto

August 9, 2022 at 6:45 am

Luna to the MOON

Reply
Nothing else matters

August 10, 2022 at 6:53 am

Dankeschön

Reply
Zack Schmidt

August 14, 2022 at 12:30 am

Outstanding review of the state of the art for 2020. It’s interesting to see how fast this area has changed since 2020 and is still changing in 2022. Professor Dan Boneh has a great perspective and I enjoy his fast paced review of the most relevant topics.

Reply
Kryptstar Crypto

August 24, 2022 at 2:21 am

Terra anchor was an amazing idea

Reply
Kryptstar Crypto

August 27, 2022 at 1:25 am

Awesome! Thank you 🙂 LUNAMOONA

Reply
John Doe

September 21, 2022 at 7:15 am

Proof of Burn was mentioned in bitcoin wiki back in 2012 and has now been implemented by Koinos blockchain. I wonder if Dan is aware of this consensus algorithm.

Reply
Ram Das

March 20, 2023 at 4:29 am

He shills a lot of problematic VC pushed projects, which is obviously not apparent to the inexperienced audience. The best part is where they dress one of the symbolic users in a niqab, because why not add some misogyny to a talk about blockchains for no good reason. Women in Iran will love the symbolism.

Reply
Srinath Kunapareddy

March 23, 2023 at 1:21 pm

You can say someone is a great teacher if they start with the first principles and then build on top. I don’t see that happening here. There is no follow on material shared too. These high level explanations just obfuscate true understanding,

Reply

Science & Technology

Learn What VCs Actually Want, From a Founder Who’s Raised $1B l Build Mode

Investors want founders who understand the financial reality of their business. Messy data, misunderstood metrics, or waiting until you’re nearly out of cash to start fundraising can cost founders leverage, valuation, and even a term sheet. In this episode of Build Mode, host Isabelle Johannesen sits down with Sasha Orloff, founder and CEO of Puzzle…

Published

1 day ago

August 20, 2026

CYBER TECH TV

In this episode of Build Mode, host Isabelle Johannesen sits down with Sasha Orloff, founder and CEO of Puzzle and Startup Battlefield alum, to talk about what he’s learned from building companies that have raised more than $1 billion collectively.

Sasha breaks down what investors look for during fundraising, which financial metrics founders should know by heart, and why VCs don’t expect your startup to be perfect—they expect you to understand its reality. He also shares how he nearly lost a term sheet because his data room wasn’t ready, how fundraising diligence changes as a startup grows, and why getting your financial house in order can help founders raise with more confidence and leverage.

They get into:
– What raising more than $1 billion across multiple companies taught Sasha about fundraising
– Why investors value founders who have a strong grasp of their company’s financial reality
– The financial metrics founders should know before pitching VCs
How investor expectations change from pre-seed and seed through Series A, B, and beyond
– Why revenue growth and the quality of that revenue are critical fundraising metrics
– How runway, margins, sales efficiency, and profitability factor into investor decisions
– Why waiting until you’re running out of cash can hurt your fundraising leverage
– How Sasha nearly lost a term sheet because his data room wasn’t ready
– Why financial organization and compliance can influence investor confidence and startup valuations
– What founders should have prepared for the due diligence process
– Why VCs don’t expect perfection—and why being honest about what isn’t working can make for a stronger pitch
– How Sasha’s own fundraising and finance frustrations ultimately led him to build Puzzle
– How AI could change the way startups manage accounting and understand their financial health

Chapters:
00:00 – Why VCs Want Founders Who Understand Reality
01:26 – Sasha Orloff’s Journey to Building Puzzle
05:05 – Why Puzzle Started With Startup Founders
08:38 – What Founders Should Know Before Fundraising
11:08 – What Investors Look for During Due Diligence
14:37 – Understanding the Financial Health of Your Startup
17:52 – The Financial Mistakes Founders Make
20:19 – When Startups Need Accountants and Finance Teams
24:04 – How Sasha Almost Lost a Term Sheet
26:10 – The Financial Metrics Founders Should Know Cold
28:20 – Lessons From Raising $1B+ Across Multiple Companies
31:45 – Why Financial Readiness Matters to Investors
33:49 – How AI Is Changing Startup Accounting
37:17 – Inside Puzzle’s Series A With General Catalyst
38:52 – Launching Puzzle at Startup Battlefield
40:38 – Sasha’s Advice for Early-Stage Founders

Subscribe to Build Mode:
Apple Podcasts
Spotify
Wherever you like to listen
New episodes of Build Mode drop every Thursday.

Science & Technology

How Satellites and AI Can Protect the Planet | Robbie Schingler | TED

Published

1 day ago

August 20, 2026

CYBER TECH TV

Space technologist Robbie Schingler cofounded a satellite company that images the whole planet every day, making visible changes on Earth. He shows how pairing that data with AI creates a “planetary intelligence” we can use to spot emerging threats we might not have seen otherwise. Now he asks: Can we close the gap between seeing a crisis coming and actually stopping it? (Followed by a note from TED guest curators Divya Siddarth and Audrey Tang) (Recorded at TED2026 on April 14, 2026)

Join us in person at a TED conference:
Become a TED Member to support our mission:
Subscribe to a TED newsletter:

Follow TED!
Instagram:
LinkedIn:
TikTok:
Facebook:
X:

The TED Talks channel features the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less) — plus originals, podcasts and exclusive content. Look for videos on Technology, Entertainment and Design as well as science, business, global issues, the arts and more. Visit for our entire library, transcripts, translations and personalized recommendations.

Watch more:

TED videos may be used for non-commercial purposes under a Creative Commons License, Attribution–Non Commercial–No Derivatives (or the CC BY – NC – ND 4.0 International) and in accordance with the TED Talks Usage Policy: . For more information on using TED for commercial purposes (e.g. employee learning, in a film or online course), submit a request at

#TED #TEDTalks #Tech #ClimateChange

CNET

That Voicemail Isn’t Real, It’s AI. The New Wave of AI-Impersonation Scams

Scammers are using AI to impersonate high-profile targets, such as celebrities and politicians. Here’s how you can stay safe. You can find the products mentioned in this article linked below Commerce Link *CNET may get a commission on these offers Link to CNET article: Read more about X on CNET.com: Timecode Chapters: 00:00 The Threat…

Published

2 days ago

August 20, 2026

CYBER TECH TV

Scammers are using AI to impersonate high-profile targets, such as celebrities and politicians. Here’s how you can stay safe.

You can find the products mentioned in this article linked below
Commerce Link
*CNET may get a commission on these offers

Link to CNET article: Read more about X on CNET.com:

Timecode Chapters:
00:00 The Threat of AI Impersonation
01:25 How Deepfakes Are Used in Politics
04:07 The Rise of Hyper-Personalized Fraud
05:42 Testing a Voice Clone on My Boss
07:11 Audio Blind Taste Test With My Sister
11:10 How to Stay Vigilant Against AI Clones

Video Credits:
Host: Katelyn Chedraoui
Scripted by:Katelyn Chedraoui
Producer: Numi Prasarn
Camera: Carly Marsh
Video Editor: Jon Gomez
Thumbnail Designer: Zooey Liao

Add CNET as a trusted news source
Never miss a deal again! See CNET’s browser extension 👉
Check out CNET’s Amazon Storefront:
Subscribe to CNET on YouTube:
Follow us on TikTok:
Follow us on Instagram:
Follow us on Bluesky:
Like us on Facebook:
CNET’s AI Atlas:
Follow us on X:
Visit CNET.com: