Blockchain Explained

Ajoutée 30 juil. 2019
Learn more about Blockchain technology:
Check out this blog on the different types of Blockchain:
Learn about different Blockchain use cases:
Blockchain is a distributed and immutable ledger allowing you to track anything, including tangible or intangible goods. This enables users or organizations to digitally and securely record entries, that are in-turn endorsed and secured by a community of users.
Check out this lightboard video with Sai Vennam from IBM Cloud as he takes a deep dive into blockchain technology and covers everything from smart contracts to permissioned and permissionless blockchains
Get started for free on IBM Cloud:


  • THAT MAN IS WRITING BACKWARDS or the video is simply mirrored

    • Hi Felix! You know what, we actually don't backward. Here is a blog post we wrote that explains how we do it, with a photo.

    • Hey Felix! Here's a post we created to explain how we did the trick :) -

  • Is this part of your Khan Academy series?

  • A permissioned blockchain is just a database!

  • Permissioned Blockchain = Distributed databases

  • I just subscribe. Thanks to your clear explanation. Good job! 👏👏

    • Glad it was helpful, Rochille. -Sai

  • The point that is buried is this: why a blockchain is needed? For example, what role does a blockchain play in determining if all the condition for a shipment are met? Isn't this just a simply check?

    • Hi speng01! The blockchain is a single source of truth that is capable of managing itself for multiple entities. In my example, it was across multiple companies who each need a different scope of data stored in the same chain. This is inherently more advantageous and secure than each company keeping its own records. Thanks for watching, San

  • Why do you need an intensive problem for the proof of work

    • Hi Banonie! The Blockchain is distributed across all of its peers - meaning you and I could run a public permissionless blockchain on our local machines! So what if you and I both wanted to add our own transaction to the chain? To avoid our two blockchains becoming forked (no longer matching), a race (complex problem) is implemented. The first one of us to finish the race gets to add the transaction - let’s say that I won. You would then verify that I really did finish the race first, and also validate the transaction that I added. Thank you for watching! -Sai

  • What software did he use to write like that? Anyone know?

    • Here's a post we wrote to explain how these videos are created. Let us know if you have any more questions and thanks for visiting.

  • i need to know more on blockchain

    • Hi Ramesh: Here are some additional resources for you on Blockchain: Learn more about Blockchain technology: Blog on the different types of Blockchain: Learn about different Blockchain use cases: Hope this helps! --Sai

  • Amazing well described this complex topic , especially the difference between public and "private" block chains has been pointed out very well. I was always asking myself, how block chain wants to become so successful in a world where transparancy is often requested but not I know. Thank you!

    • Christian we really appreciate your feedback. Thank you, San

  • Please help me Tutorial for learning block chain technology for free

    • Hi Arpit! Here are some additional resources for you on Blockchain: Learn more about Blockchain technology: Blog on the different types of Blockchain: Learn about different Blockchain use cases: Best, Sai

  • Thank you for the helping definition.

    • Glad it was useful Todd. Thank you for watching. --Sai

  • very helpful!

  • Well done, Thank you

  • Is this guy writing backwards? What witchcraft is this?

    • It’s a special type of glass board

    • lulz me too!

    • lol i wanted to do the same question!!!!!

    • Omg this is so mindblowing

    • They inverted the video horizontally 😆 I was curious about it too

  • A permissioned blockchain is a misnomer of blockchain. If it is permissioned, it is not blockchain. It already exists and existed before web 1.0. All of the features exist and are in use today and have been in use for the last 40+ years before the internet, when large corporations had their intranet, and before then as hard-paper copy audit trails. Part of the definition of blockchain is that it is permissionless. You had your Freudian slip when you first misspelled "Privacy".

  • Please, elaborate on smart contracts. That's the next big thing probably for medium to large businesses.

    • Hi Tony: Thanks for your question. To learn how to create smart contracts on hyperledger fabric, check out this pattern: Best regards, Sai

  • Sai you are the MAN!

  • Another good one sai!!

  • how can i access the data from the blocks ?

    • Hasan, it seems you would have to TRUST an entity to give you valid block data. Bitcoin solves this by everyone running a full node (no mining needed for this).

    • @Richard Allen Your thoughts on using blockchain for streamlining comliance(Customer Due diligence/KYC) in Insurance.

    • Dm me for more information

  • Blockchain rocks ! Thx for the video