Implementing Proof-of-Work in Javascript (Blockchain, part 2)

Adding the proof-of-work mechanism to our homemade Javascript blockchain.
Proof-of-work will secure our blockchain against spammers and people trying to tamper with our blocks.
► Source code
Available on GitHub:
github.com/SavjeeTutorials/Sa...
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[@jessss7792]

Another solid video. Please continue this series, I'd love to see part 3!

[@elgrimoriodelchamo1017]

Same here. Amazing videos. Greetings from Venezuela, thank you very much Savjee!

[@LeandrocBr]

one more here!!

[@BFFGamingHD]

YES, YES AND YEEEEES!

[@austinkim1735]

one more!

[@joaofrutinho]

Epale chamo, yo también estoy en Venezuela, estoy interesado en hacer contacto con otros desarrolladores de aquí, si quieres nos contactamos, yo soy autodiacta. Así que sería genial poder ver en qué podemos ayudarnos.

[@exo.master]

It is kinda funny how we, software developers with some knowledge about Object Oriented Programming, can understand the concepts very fast when classes are given in OOP. Between .. dear Savjee, your techniques show excellence on teaching, congratulations!!

[@jgttech]

So true. I was just saying to a co-worker of mine that I wish everything was explained in OOP, then I could learn physics and anything at that point lol. OOP is how you communicate to a modern developer lol. So freaking true.

[@fxstreamer238]

@@jgttech If you dont understand physics you probably wont understand oop

[@_jko]

This is exactly I came to watch the video. I watched a bunch of other videos that tried to explain the concept, but it generated MORE questions, not less. It's easier to understand things in code, because there are no contingencies. All the ideas, advantages, disadvantages, potential for bug, etc., are all in the code, whereas spoken words are so malleable and leave a lot of room for interpretation.

[@jordixboy]

@@fxstreamer238 what has physics to do with OOP lol. It's just a way to model data, another data structure, nothing more.

[@fxstreamer238]

@@jordixboy ask the other guy. he wants to learn physics with oop. you thought you were smart but you just caught off guard didnt you

[@drbasavarajans]

And finally I could comprehend what bitcoin is. Thanks for that crisp and neat threadbare tutorial. Thanks. Hats off to your skill of telling.

[@fxstreamer238]

congrats now you are 0.0001 % closer to understand btc.

[@xCoKeZx]

I never really understood how blockchains work until now. Apparently all I needed was an illustration in an OOP-way. Thanks a lot!

[@waseem_498]

Thought the same

[@cameronm9968]

Seriously helpful video man! Seeing it implemented made blockchains so much easier to understand. I finally get why proof-of-work actually works and how it prevents and slows malicious modifications to the chain. Incredible work.

[@_jko]

Thanks for the video. I watched a bunch of other videos that tried to explain block chain in plain English, but they utterly failed. You started with the basic idea, and improved it as you went on through the video to show how to address potential pitfalls. That was really helpful. None of the other videos do that. They just simply throw a definition at you and hope that you understand it from there.

[@JackSparrah]

Just starting to learn about blockchain in 2021, and this was super helpful. Seeing it coded live made it so much more clear. Thank you!

[@rishabhsingal9423]

I've watched more than 6 hours worth of videos on blockchain but still never understood how it really works. But this 6-minute video quick explains how blockchain works in such an easy-to-understand way! Hats off, thank you!

[@artofchickens]

I just recently found your channel. This and your previous video are awesome! I have yet to watch the rest. Thanks so much for such valuable information!

[@kkode001]

Very helpful series. Awesome!!! 10 mins of code is better than 10 hrs of talk. Thanks and keep it up.

[@freddie2153]

Great series so far, easy listen but packed full of info!! Looking forward to more.

[@lovebajpai5288]

Great work Savjee!! It simply explains the nonce, difficulty and mining in such an easily understandable way!!! Thank you!!Can you also do something around Valet and how it fits in all this?

[@fredkilby5535]

Great video in explaining the technical aspects of blockchain and how to parts fit together.

[@cazino4]

Fantastic video, great to see a practical examples of what a block chain implementation might look like. Thank you.

[@rum81]

Thank you very much for these two videos, i have understood in 15-20 minutes what could not understand after months of blog and videos on block chain

[@lapsedubstep]

AMAZING video. thankyou! Hope to see part 3 ❤

[@BFFGamingHD]

Savjee, please continue this series! I love it and I love you

[@kp8752]

These videos are fantastic honestly. Also the easiest to understand blockchain intro tutorial

[@jamallucas]

I finally understood the logic behind blockchain. Great video buddy!!!!!

[@aeonreigh]

I love this! way better from the talks I've been to about block chain!!!

[@lucasalvesdossantos3993]

I'm a professor watching the playlist from Brazil! Tranks!

[@4by4rusjo44]

Great stuff mate. Thanks for sharing

[@adams1378]

Amazing video dude. Please continue along that path, really interesting !

[@JChengZhang]

Explained so simple. Please continue with this!

[@jobsphil9553]

Thanks for your sharing.. You are the great.. definitely .

[@arsnakehert]

Damn, what a brilliant little series! This is so very illustrative! Thank you!

[@phillipesmith5401]

Belittling?

[@vsowill]

It’s wild how relevant this video is in 2022 and it’s 4 years old. 🔥🔥

[@vprnet]

Surah, you are a very talented instructor!

[@techtantrik]

Well paced lab and very well explained. Thanks!

[@g_pazzini]

awesome.... i'm an OOP developer... and i can finally understand blockchain by watching your videos... thanks!

[@AnishSingh-st5yl]

Merci beaucoup Xavier...

[@FreedomForKashmir]

I LOVE your videos on blockchain ..... you are the best teacher over the internet You cleared a lot of my concepts

[@phet1574]

Great series! I would love to see the part3 :D

[@DurgaPrasad3496]

This is Awesome. After watching this video i get into better perspective of blockchain. Thank You!

[@kejoe100]

Thanks for the videos, I love this kind of series!!! Plz plz make next videos

[@jazztwk]

Great video, really explain clearly in the technical prospective of proof of work, please make more example video

[@yousafhassan8655]

Thank you so much Sir. The mining concept was very well explained.

[@phnxbr]

Hi! It was a pleasure to watch these videos, really simple comparing to others overсomplicating it. Just keep going.

[@saumilkapadia88]

mind blowing brilliant video and explanation.

[@therealguanzo]

This is so informative for someone that knows nothing about blockchain tech. Thanks!

[@nandusuy]

Thank you. Learning with you is a comforable experience!

[@chrisc9725]

Wow man I've just come across your channel, its amazing, thank you.

[@mikeigoe]

Brilliant tutorial, thanks.

[@Grkashani]

you are awsome man !!!!!!!!!!!!! , after many years looking for understanding blockchain I found my answer from you , thank you so much,

[@rleevzlno]

Awesome content. Thanks for share it

[@PavonDunbar]

Amazing video. Subscribed. Thank you!

[@neerajkulkarni6506]

This is so well explained!

[@ankitasaxena5891]

This channel has liberated my mind! I repeat 'LIBERATE'!

[@maxbruhn8383]

Very good video. Keep em coming.

[@LeandrocBr]

Fantastic!!! I would like see another videos about this...

[@munezhans7735]

Well done. Thank you

[@juancarlosgonzalez9722]

Solid explanation my dude. Thank you.

[@trungkienle3714]

thank you so much! It really helpful to me

[@nouhbelahcen4486]

Really amazing explain, Thank you very much.

[@ayuthmang]

Thank you for explaining block chain and proof-of-work in the easiest way. Hope to see more videos. -)

[@jimannothe]

In the easiest way. though that's subjective

[@gabrielmicko4771]

Very great, solid video. Thanks

[@jaikant931]

Brilliant explanation. cheers

[@gilbueno5181]

Make a Part 3 please :)

[@kinershah464]

Wow that was simple and it seems to be quite effective solution.

[@j8577798yt]

Best explanation on the net !!!

[@shgazda]

Man, great video! Thanks!!

[@YogeshPadsala]

yes this is a great video. thank you

[@dipanshunegi9805]

Thank you do much sir .. love you for this.

[@RaceBook.]

Please upload the 3rd part also. great video lecture

[@Raayol]

Thank you!!! You are awesome!!

[@potterprasant380]

Osm... Thank You For This video ❤

[@samueleagostinelli5346]

Loving this

[@mralextacy]

fantastic! subscribed.

[@flamingwoodz]

This video series is awesome

[@hadireg]

excellent explanation!!!👍👍

[@john-blair]

Great video. Simply Explained. Thanks.

[@FredChevitarese]

Very nice videos. Keep doing this :) Thanks!

[@RyanHooGeek]

Really nice video, it explains a lot! Words in the paper of bitcoin were so confusing before I watch this.

[@footstepparecords]

wow.. this is so dope!

[@i6mi6]

Excellent work!

[@SvartAdamSolander]

Really good video that really explaines it very well! I'm subscribing!

[@saltblue3250]

Great explanation!

[@emilie1977]

Merci, Thank you, Grazie!

[@mtiderman]

outstanding! Thanks

[@nicolaimartin7279]

amazing thx for share

[@klx450dude]

greaaat greaaat video! Best explanation so far i found online about blockchain and mining, thank you! Please continue! :D

[@simplyexplained]

Working on something right now. Will be published after next Explained video 🤐

[@christopheverdot9075]

Very nice video, doing a POS instead of POW would also be possible on this javascript Blockchain demonstration ?

[@ruiminti8528]

Nice,Thank you

[@shahrameez019]

Thank you 💖

[@kejoe100]

Your way of teaching is really good, very easy ro understand blockchain, its been 2 months u had not uploaded any video on this series, should we expect more videos???

[@simplyexplained]

Sometime in the future yes. Been busy with the Simply Explained series. Been thinking where I can take this Javascript implementation next.

[@kejoe100]

Thanks Savjee!! Good to here, looking for next videos 😊

[@mi13estrellas]

awesome ! please make a part 3 new subscriber :)

[@Mentaleak]

Great Video, Please do another one for Smart Contracts

[@buzonliao]

Awesome video!

[@yohan_aka_spof]

Very interesting ! There is just two small bugs: 1) in the constructor of your block you call calculateHash before setting the nonce, which will be then undefined. Overall, I wouldn't call calculateHash in constructor as you will anyway overwrite it inserting it in the chain. 2) in your mining function, you first increment nonce, then you calculate your hash so you will never test the case with nonce = 0

[@sankhatvijay]

@Simply Explained - Savjee, First of thank you for the great video. I need help from you. we are planning to create new payment gateway, is it good to implement blockchain technology for our new payment gateway?

[@AmitYadav786]

Another good video !!

[@andrefurlan]

Thanks!!!

[@dennisgonzales9521]

Awesome!

[@jerold278]

Super Solid Nice !

[@user-eq8gr8vo7h]

my English is not very well but i can understand what you say, this thing not often happened ,about blockchain you do amazing job mashallah 🤩

[@jordixboy]

good job man! im curios how would proof of stake be implemented?

[@SafalLamsal]

great video!! part3 smart contracts?

[@neethucheriyan1077]

sir could you pls explain how can we update the previous hash of a particular block, when the data in the previous block is updated

[@danilosampaio6493]

Someone gives an Oscar for this guy! This is simply awesome

[@keivansf3459]

Brilliant