Blockchain & Smart contracts: Digital Evolution Conference 2018

How does a Blockchain work? What can we do with it? How do Smart contracts come into the mix?
I was invited to give a talk at the Digital Evolution conference in Malmö, Sweden. They didn't record the talks, so I decided to record it myself with my iPhone and a pair of headphones as microphone.
More info about the conference (Swedish): 8till5live.se/digitalevolution/
Big shoutout to the organizers of the event for having me!
🌍 Social
Twitter: / savjee
Facebook: / savjee
Blog: savjee.be
💌 Newsletter: newsletter.savjee.be (no more than once a month)
❤️ Become a Simply Explained member: / @simplyexplained
Chapters:
0:00 Intro
1:00 What is a Blockchain?
5:26 What is a block? What are hashes?
9:47 How are Blockchains secured?
14:47 Use cases for Blockchains
19:00 Smart Contracts
21:23 Use cases for smart contracts (today)
24:20 Future use cases for smart contracts
29:18 Summary & conclusions

[@technosavage7172]

GEMS are hidden unless you search for it,, this channel is a GEM

[@princesamuel3951]

I know right!! I'm sharing the link now!!!

[@alessiodenny6123]

YOUR EXPLANATION IS ABSOLUTELY FANTASTIC. YOU REALLY MAKE PEOPLE UNDERSTAND. YOU ARE AWESOME.

[@HelenaEonor]

This presentation is absolutely great and clear! Thank you for sharing it! 😊

[@bibbib6505]

Wonderfully explained in a simple manner ! Thanks a lot

[@hshifan]

Fantastic presentation! Your methods are absolutely brilliant. Keep it up!

[@batoolhijjawi3114]

I newly discovered your channel. You are really talented and your explanation is GREAT. Wish you all the best.

[@5ddreams783]

The best explanation so far

[@nkmdia123]

Very nicely explained the whole concept, great job

[@_init_innovate29]

That's really a great explanation ❣

[@rutviktak716]

It was amazing explanation. Thanx:)

[@ultimatebot900]

Still very relevant and great presentation!

[@mikethem4chine292]

Hi xavier, thank you for the introduction into the blockchain topic. But i have a question, the new Blocks are created by Mining. So how would a e-notary work? Will it be based on the bitcoin blockchain? If yes dones then persons which want to use the e-notary pay with bitcoins?

[@akispessiridis721]

Great Video!! I want to ask, in the hacker's problem when I am changing the hash of a block, can I just change the "previous hash" of the next block, so they will be the same? I mean, is it possible to only change the "previous hash" and not the "hash" of the block, to make this happen? Also, when the limited supply of bitcoin reaches to 21 Mil. can he just focus on the last blocks and change them. That way, he won't stay behind.

[@ZahidKhan-pf6xh]

Bro its good u have good grip on blockchain tech

[@elisaveta679]

I use your videos to explain concepts to people who don’t like reading 😆 thank you! P.S. cute Vlaamse accent

[@MinhBinh-dr9rc]

thank you for this great video

[@stocksandblocks9661]

Our mission is to inform people about blockchain. You are doing a great job!

[@Huy-ed2re]

I was among the first who watched your original video on blockchain. It was grrreat! So glad to see you do it in a live presentation. It's good to see you bro! Thanks for making these videos! Keep making more!!

[@simplyexplained]

Thanks for your comment! Will definitely make more videos. Stay tuned ;)

[@huyttvlog]

Hi, i have question: Blockchain has many nodes. Each node cointains blocks with chain:previous,data,hash. But where is smart contract now? (On every blocks ?, first block ? Or all blocks on all nodes ?)...thanks

[@antitropia]

Amazing!!!!

[@ethanhalprin]

very well explained👍

[@AbdulRasheed-ru9gs]

Hi dear! I am Abdul Rasheed from Pakistan and I really like your way of explanation, its really match your way of explanation and your KZbin Chanel name so keep on going like that. I am currently working on my FYP project which is about the Patient Record Management System using Blockchain Technology. So I want that You make a video about health record management in which please explain roadmap of development and all the tools technologies working. In that my project I am using Blockchain Technology, IPFS, React, Web3js, Solidity, HTML, CSS, Ganache, Meta Mask google chrome extension. Thanks

[@kasiviswanath4784]

Your explanation is simply awesome. Thank u so much!

[@moaminalabdullah175]

one of the best presentations .. thank you

[@chamangupta4624]

Bro can i get that presentation, If not atleast tell how did u made it, Thanks in advance 😀

[@davidaz1326]

how can you work in a blockchain if the data stored in a block can't be changed? I mean, how do you update information? in the case of a client changed his address/phone number? Sorry, I'm newbie in blockchain technology.

[@mohammedashraf1779]

How did you made that great presentation is it power point or you used other software?

[@GeoffreyProfessional]

Thanks for this. You're doing an awesome job!

[@mavhunter8753]

You did a great job here.

[@sivan2878]

nice explanation..

[@thagish36]

Wish you were my teacher in all subjects!

[@shenymaropeng8646]

Is it possible to have the documentation for Blockchain based system to store details of patients using smart contracts

[@adascott994]

Excellent

[@MS-qc3rh]

“Can never successfully cheat the system” = top 10 in Famous Last Words.

[@martinleeyuenming3995]

Thank you very much, appreciate the effort in your presentation :)

[@dwisuslamanto5956]

thanks a lot

[@anoopprabhakaran6725]

Oh man... I really likes the way u present... Really simple 😍😍😍

[@mohamedrxo2006]

Think you

[@morsyabdo727]

the best presentation ever. thanks a lot

[@simplyexplained]

Thank you! ;)

[@DDMGI]

the best explanation ever

[@eryssonbarros]

Excellent talk 👏🏻 share you apresentation

[@hiteshdogra0879]

Easy & Well explained !!!!

[@assadgillani]

Thanks a lot ... you explained very simply. please make the videos for a complete course of blockchain.

[@user-ee4zy1jx6b]

Great you

[@pemidato1791]

The best presentation of blockchain so far.. Can we have your PowerPoint presentation ,pptx file.. please ... You pptx will help a lot of people toward a blockchain awareness

[@thakopia]

Awesome, cool to finally see the face behind the voice! haha

Oh no, I totally missed this. I would love to watch this live and meet you in person, especially since you were in Sweden. You have opened up a new world for me with your excellent explanation videos. Especially the one where you implement the block chain in JavaScript. (Please upload a video where you implement a peer-to-peer connection and the race between multiple miners.) 😊

[@simplyexplained]

Well keep an eye out! It wasn't my first time in Sweden and it probably won't be my last. Really love the country! Thanks for your suggestion! I'll see what I can do about the new Javascript videos.

[@Vagelis_Prokopiou]

Very nice presentation man. Congrats.

[@simplyexplained]

Thank you ;)

[@tsianopoulos]

Great video

[@TravelNomad]

Very well spoken and a very well done presentation! Good job, Xavier :)

[@simplyexplained]

Thanks a lot!

[@linuxd]

@@simplyexplained No, thank you. I've learned the most about security here.

[@RajatGuptaOnline]

very well explain, thanks

[@AliHassan-sh2rt]

what happen when project fund released by the smart contract are spends to buy resources,then projects fails ? all the money are spends to buy resources,there is no money in their account to returns.

[@simplyexplained]

Well anyone is free to use the money as he likes. There is nothing preventing people from taking it and running away with it (it can also happen on Kickstarter). You could add safety features to the contract however. Like keeping a certain amount of money locked up until the supports signal that they have received their orders. Something along those lines. Smart contracts can do anything you want ;)

[@AliHassan-sh2rt]

Thank you.

[@code4chaosmobile]

Great video, thank you. Blockchain + p2p + web page|blog|social network = something new

[@1ali1996]

Thanks....

[@andyandrw]

Excellent talk!! Congrats :)

[@elementalnation1133]

But what if the hacker friends get into a p2p network and then he spends coins he doesnt have then his friends confirm it

[@smrutiranjangochhayat4504]

Are contracts are maintained by network? Are contracts owned by central ownership?

[@KimchiSocks]

Good job man.

[@MegaAlgerie31000]

Thanks for your great presentation.

[@1ali1996]

U deserve a lot bro u ....👊👦

[@code4chaosmobile]

Question, is anyone working on decentralization of work? Accident of birth or home address alone can have a huge effect on what you could feasibly get paid regardless of skillset or ability to learn. This is going to take a good "think"....

[@CursosExitosos]

Anyone working with an etherum or tron smart contract?

[@mildredsmith9177]

No one bothers to mention African when talking about modern technology. Did we forget what African Americans? The needs for this all started with use of P2P and the need for remembrance of funds from the diaspora to poor countries. This stared over 40 years ago in the Horn of Africa. Use your mobile phone and hear "Black people invented everything" Phillip Emeagwali, an African, moved information from mainframe to superhighway.

[@schoenwettersl]

sad how people abuse this kind of technology to make money whilst contributing nothing. precisely explained, well done 😊

[@kenpogue7399]

So the question is WHO is these people that making the consensus and who made them the people to okay theae things... this is the problem i still dont get .. these videos always refer to a group of people agreeing this and that .. who are these people and who nominated them... i

[@fathimathrufaisa6939]

What is Rayleigh consensus algorithm

[@nitinnagargoje3976]

Amazing explanation , thanks for avoiding oversimplification, as that helps to get basic idea of tech elements involved

[@DDMGI]

waoo thanks

[@valuegaptrader7243]

sir please learn us how to make own block explorer

[@simplyexplained]

Already did that: kzbin.info/www/bejne/d4K5YYqEpaqSack

[@AbdulRasheed-ru9gs]

And Please response to my comment.

[@cup_check_official]

another very disturbing use of smart contracts can be in criminal activity or assassinations... A smart contract can be set up for an assassination and it will release the payment after the confirmation of the assassination via online news.

[@simplyexplained]

This is a bit concerning... I hope you don't have plans like this :O But yeah, it could be used for this as well. Although I can imagine it will be hard to let the smart contract read the news and detect a successful or failed execution.

[@ebenezerohunyon879]

when it comes to programming, anything is possible!...who ever believed there could ever be a face detection alogrithm or fingerprint senseors? anything is possible with programming bro.

[@ShujathHussain0]

you speak as if in real world people don't do this using fiat currency and mafia power laser gun is as harmful as bullet based machine gun

[@phishiphishi]

+Software Man LoL....... how old are you ...????

[@donakaveidt2980]

There's a disturbing use for just about anything. just look at how money is being used. On the bright side, there's more good uses than bad uses for smart contracts. Do some research on it.

[@jayg1996]

I feel sorry for KZbin, future is not bright for it!

[@konseq1537]

Why would any company want all their data stored in a way that it is accessible by anyone including their competitors? Also data protection laws require companies to protect the data of their users from others so using blockchain is not possible in the first place. In my oppinion blockchain for companies only works with data that they have to or are willing to share anyways like your WallMart example. But even then why use a blockchain when you can use much easier systems like a website to publish that data? Another issue I see with blockchain is the human factor. Humans make errors when entering data. What if false data are entered into the blockchain? Now I can never correct that mistake again because it is designed that you can't change data in the blockchain? Not very practicable. In a regular database the admin or others could correct it. What happens in case of WallMart if a meat producer accidentally enters data saying a shipment of meat is chicken when it actually is turkey? And don't even get me started on the much higher energy consumption of blockchains compared to other systems. I am not saying blockchain is totally useless but its useful use cases are much more limited than the current hype suggests in my oppinion.

[@simplyexplained]

A lot of stuff here to address. You make some valid arguments. Data protection and blockchain are two topics that are hard to mix (but not impossible). It's true that companies usually don't want to decentralize their business because that would put them out of work (like Kickstarter for instance). However that leaves the door open for others to do it. I can imagine that people passionate about open source would want to create decentralized alternatives to eliminate intermediaries. Is publishing to a website easier? Absolutely! But it has its disadvantages. It's not distributes, there is a single point of failure and as a user you can't know if someone has tampered with the website. The human factor is indeed an import factor and people will indeed make mistakes. The key here is to automate all of this to prevent people from making mistakes and to prevent tampering with data. The immutability doesn't have to be a problem. You can design a system that allows you to revise the data by adding updates to your blockchain. Something similar to what IPFS does. The energy consumption is something that is being actively worked on. This is a property of the proof-of-work algorithm. Alternatives like Proof-of-stake are much more energy efficient.

[@phishiphishi]

+Konseq...... you have totally missed The most important part of block-chain tec..... !!!! the ledger is consensus based ... meaning that NOTHING is written to the block-chain until a certain number of people or contracts have analysed & agreed that the transaction is correct ..... if it is not correct it is automatically rejected after an amount of time... ie: not written to the block-chain ....

[@donakaveidt2980]

Konseq. You're right that companes don't want their sensitive or critical data accessible by anyone. That's why they'll use a private blockchain for that.

[@sanxyzee]

he made a mistake when he told how hacker will always stay behind the real world. Every 10min Hacker+world will solve the puzzle, either the hacker will or the world will not both every 10min. Hacker will win if he had >50% of all hash power else the world will win.

[@fredi1356]

Bilal, Hasan, Not only the hash power but the nodes in addition too. All miners already have 100% of hashing power but not the number of nodes that audit their compliance.😎

[@simplyexplained]

Yes you're correct but I didn't want to confuse the audience by mentioning the hashing power and all the dynamics that brings. So I tried to generalize and say that a single hacker can't outrun the network. But point taken, if this were a technical talk I should've mentioned the combined hashing power. Thanks!

[@sanxyzee]

Thank you for all the great work you do. Please make a video on all the ERC token standards available and explain what is the problem with older standards like ERC-20 and ERC-721 that we need the new standards.

[@MohammadArif-wh9sv]

Can these conditions be met and is it safe? please help Conditions: - the amount of the contract /ETH-tokens/ will be sent to the ETH wallet address of the investor within 2 business days from the moment of receiving confirmation of the contract from the investor - full tax reservation amount* has to be deposited to the BTC hedge account xyz by the investor before the end of the contract 31 May 2023.