Blockchain 101 – A Visual Demo
This is a very basic visual introduction to the concepts behind a blockchain. We introduce the idea of an immutable ledger using an interactive web demo.
0:00 Intro
0:15 SHA256 Hash
2:18 Block
5:16 Blockchain
9:20 Distributed Blockchain
12:19 Tokens
14:36 Coinbase Transaction
Part 2 is here:
If you are interested in playing with this on your own, it is available online at:
The code that runs this demo is also on GitHub:
I’m @anders94 on Twitter and @andersbrownworth on Steemit.
Donations:
BTC: 1K3NvcuZzVTueHW1qhkG2Cm3viRkh2EXJp
ETH: 0x84a90e21d9d02e30ddcea56d618aa75ba90331ff
ETC: 0xab75ad757c89fa33b92090193a797e6700769ef8
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I have had to turn comments off on my blockchain videos due to spam. If you want to reach out to me, please find me on twitter @anders94 instead.
Most of the recent comments (which I've been judiciously deleting these past few years) have been people pushing an "I can get your private keys back for you" scam which, as everyone who has watched these videos knows. is quite impossible. I hate to take such a drastic measure but I'm afraid I just don't have the time.
love it, but why not just start new blocks? ( i have 100000000): how start?
Terrific!
i have this code but i don't know how i run the code
i have taken the code in git hub
millions of millions like for this video. Thank you so much!
Where can i find more quality content like this? Im looking for good course for a computer science engineer, a technical course. Not something like "blockchain is taking over the world". I wanna know how it works and how to develop things with it.
the best one!
Very helpful. Thank you for the effort!
Awesome Video, can you say which language that was written in?
What does a "signed block" mean? Does it mean mined block?
Even if I'm not a native speaker this is the best explanation I have ever received. Your ability to explain complicated things in such a simple way is amazing! I wish I had professors like you at school! Just a couple of litte questions, Anders. In the Coinbase section you list as a separate field the transaction Coinbase to Anders. First question: Do you mean Coinbase as the famous Coinbase company and so you are assuming that Anders receives money from a Coinbase transaction is his favour? What is the sense of repeating the same $100 coinbase -> Anders in all next blocks ? Why on the last block there is a $100 Coinbase ->Sophia? It seems not to make any sense as Sophia would not give out any further money to anyone in that block. Thank you very much again!
Oh my god the should be at the top of YouTube results when anyone wants to know what blockchain is!!
Best blockchain explanation ever! You are a legend.
it's really nice; best explanation of blockchain i've ever seen before <3
Really well explained!
hello sorry im also trying to just use your program online in a browser but i cant get it to wrok..ot says save file and i save it andnothing happens or if i try to open with i try a browser but it still saves the file ..thx if anyone can help..jessica
npm ERR! Linux 4.4.0-31-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "install"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! typechecker@2.0.8 preinstall: `node ./cyclic.js`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the typechecker@2.0.8 preinstall script 'node ./cyclic.js'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the typechecker package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./cyclic.js
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs typechecker
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls typechecker
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /home/r1/blockchain-demo/npm-debug.log
r1@ubuntu:~/blockchain-demo$ npm bugs typechecker
r1@ubuntu:~/blockchain-demo$ cd ..
r1@ubuntu:~$ ls
blockchain-demo Downloads install-cc.1 Public Videos
Desktop examples.desktop Music s9s_tmp
Documents install-cc Pictures Templates
r1@ubuntu:~$ cd blockchain-demo
r1@ubuntu:~/blockchain-demo$ ls
app.js Dockerfile node_modules public views
bin LICENSE package.json README.md
docker-compose.yml locales package-lock.json routes
r1@ubuntu:~/blockchain-demo$ npm start
> blockchain-demo@0.0.1 start /home/r1/blockchain-demo
> node ./bin/www
sh: 1: node: not found
npm ERR! Linux 4.4.0-31-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! file sh
npm ERR! code ELIFECYCLE
npm ERR! errno ENOENT
npm ERR! syscall spawn
npm ERR! blockchain-demo@0.0.1 start: `node ./bin/www`
npm ERR! spawn ENOENT
npm ERR!
npm ERR! Failed at the blockchain-demo@0.0.1 start script 'node ./bin/www'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the blockchain-demo package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./bin/www
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs blockchain-demo
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls blockchain-demo
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /home/r1/blockchain-demo/npm-debug.log
r1@ubuntu:~/blockchain-demo$ ./bin/www
/usr/bin/env: ‘node’: No such file or directory
r1@ubuntu:~/blockchain-demo$ node ./bin/www
The program 'node' is currently not installed. You can install it by typing:
sudo apt install nodejs-legacy
r1@ubuntu:~/blockchain-demo$ sudo apt install nodejs-legacy
[sudo] password for r1:
Reading package lists… Done
Building dependency tree
Reading state information… Done
The following NEW packages will be installed:
nodejs-legacy
0 upgraded, 1 newly installed, 0 to remove and 81 not upgraded.
Need to get 27.9 kB of archives.
After this operation, 82.9 kB of additional disk space will be used.
Get:1 http://us.archive.ubuntu.com/ubuntu xenial-updates/universe amd64 nodejs-legacy all 4.2.6~dfsg-1ubuntu4.2 [27.9 kB]
Fetched 27.9 kB in 0s (70.5 kB/s)
Selecting previously unselected package nodejs-legacy.
(Reading database … 195804 files and directories currently installed.)
Preparing to unpack …/nodejs-legacy_4.2.6~dfsg-1ubuntu4.2_all.deb …
Unpacking nodejs-legacy (4.2.6~dfsg-1ubuntu4.2) …
Processing triggers for man-db (2.7.5-1) …
Setting up nodejs-legacy (4.2.6~dfsg-1ubuntu4.2) …
r1@ubuntu:~/blockchain-demo$ node ./bin/www
module.js:328
throw err;
^
Error: Cannot find module 'express'
at Function.Module._resolveFilename (module.js:326:15)
at Function.Module._load (module.js:277:25)
at Module.require (module.js:354:17)
at require (internal/module.js:12:17)
at Object.<anonymous> (/home/r1/blockchain-demo/app.js:1:77)
at Module._compile (module.js:410:26)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Module.require (module.js:354:17)
r1@ubuntu:~/blockchain-demo$ npm start
> blockchain-demo@0.0.1 start /home/r1/blockchain-demo
> node ./bin/www
module.js:328
throw err;
^
Error: Cannot find module 'express'
at Function.Module._resolveFilename (module.js:326:15)
at Function.Module._load (module.js:277:25)
at Module.require (module.js:354:17)
at require (internal/module.js:12:17)
at Object.<anonymous> (/home/r1/blockchain-demo/app.js:1:77)
at Module._compile (module.js:410:26)
at Object.Module._extensions..js (module.js:417:10)
at Module.load (module.js:344:32)
at Function.Module._load (module.js:301:12)
at Module.require (module.js:354:17)
npm ERR! Linux 4.4.0-31-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "start"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! code ELIFECYCLE
npm ERR! blockchain-demo@0.0.1 start: `node ./bin/www`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the blockchain-demo@0.0.1 start script 'node ./bin/www'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the blockchain-demo package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! node ./bin/www
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs blockchain-demo
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls blockchain-demo
npm ERR! There is likely additional logging output above.
npm ERR! Please include the following file with any support request:
npm ERR! /home/r1/blockchain-demo/npm-debug.log
r1@ubuntu:~/blockchain-demo$ npm bugs blockchain-demo
npm ERR! Linux 4.4.0-31-generic
npm ERR! argv "/usr/bin/nodejs" "/usr/bin/npm" "bugs" "blockchain-demo"
npm ERR! node v4.2.6
npm ERR! npm v3.5.2
npm ERR! code E404
npm ERR! 404 Not found : blockchain-demo
npm ERR! 404
npm ERR! 404 'blockchain-demo' is not in the npm registry.
npm ERR! 404 You should bug the author to publish it (or use the name yourself!)
npm ERR! 404
npm ERR! 404 Note that you can also install from a
npm ERR! 404 tarball, folder, http url, or git url.
npm ERR! Please include the following file with any support request:
npm ERR! /home/r1/blockchain-demo/npm-debug.log
r1@ubuntu:~/blockchain-demo$
*hello i tried running your source code with the steps from github page but i get the erors above* Jessica
hello i am trying to run the code in cygwin and i am getting this error….**SyntaxError: Invalid or unexpected token
at Module._compile (internal/modules/cjs/loader.js:723:23)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
at Module.load (internal/modules/cjs/loader.js:653:32)
at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
at Function.Module._load (internal/modules/cjs/loader.js:585:3)
at Module.require (internal/modules/cjs/loader.js:692:17)
at require (internal/modules/cjs/helpers.js:25:18)
at Object.<anonymous> (C:cygwin64homeTommy Robertblockchain-demoapp.js:9:14)
at Module._compile (internal/modules/cjs/loader.js:778:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)**…..would you know how to solve this?..i am on a win dows 7 machine..should i try to run it on VMware ubuntu machine?,,thxz for your great vid…Jesiica
Best demo I've seen. In the future, public-private key pair will replace social security numbers, passwords, account codes, driver's license #, passpost #, etc….
This is the best video i have seen on this subject.
The only video you need to watch to understand the working of a blockchain!!
Good work!
Grazie per aver condiviso la tua competenza su questa tecnologia. Molto chiaro e esauriente.
Thanks for your explanation
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Cannot read property 'getBytes' of null..
Why I get this when using var keypair = ec.genKeyPair();
Best explanation of blockchain that I have ever seen. THANK YOU Anders ! Please keep posting such videos.
Best Blockchain explanation I've ever seen, thanks for this great video tutorial!
Beautiful. Elegant. Concise. Perhaps the most productive 17 minutes I spent today.
Absolutely Superb ! Now better way for a beginner to learn this ! Thanks a ton Anders.
15:25 – Anders: "It follows a basic rule of a currency. Like you can't invent it out of thin air."
2017 – Literally every ICO: "Hold my beer."
For all those who manged to thumbs down this awesome video, you are upside down.
Thank You so much… This is the video i was searching for in the entire youtube. But you helped me with this.. I cannot thank you enough for this help .. Have a nice day.. Country – Nepal 😀
Very helpful and clear explanation. Thank you, Anders.
Wow amazing tutorial! Wish you had more in Ethereum!
one of the best and simply explained video to understand basic blockchain workings.
I keep referring to this video because it's the best one I've ever seen.
a pride and prejudice as well as blockchain fan? Is this my soulmate?
I wish I could find this video before. Could save my lots of hours…a must watch..
Best explanation ever!! thank you so so much for this.
This is the best demo I have every seen for blockchain