Blockchain and Cryptocurrencies

Blockchain and Bitcoin 101
#165

Thank you :+1: for your ThortSpace answers they really suit my learning manner

#166

I think its the nodes Nodes form the infrastructure of a blockchain . All nodes on a blockchain are connected to each other and they constantly exchange the latest blockchain data with each other so all nodes stay up to date. They store, spread and preserve the blockchain data, so theoretically a blockchain exists on nodes .

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#167

Hello Ivan , few questions

  1. for a begginer what could you recomand for additional information , ex… ebook , book ,web page - which you apreciale as a very good source of information
  2. Wirex is a company with Visa card and crypto wallets . Do you know it ? Which is a trustable company who has these servicies . Thanks a lot
#168

All full nodes have a copy of the blockchain. You will learn more about it later in the course.
Users using a simple lightweight software wallet (SPV) will basically query other full nodes who have the whole blockchain.

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#169

So awesome! Mind mapping for sure!

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#170

It need consensus before is written, so is difficult to lie :wink:

#171

Nope. I don’t leave scraps around the place. If its important I look it up and get the review along the way. The important part is knowing where to find the hooks.

#172

The course is great and learning a lot. This is allowing me now to proper converse on the topic in general

#173

Thanks for the reply, have a great day…!

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#174

I loved the clarity of your explanation of the importance of blockchain and how trustless procedures that it represents.

#175

i like your image representations. Also adds value to the learning. Thanks Keep it up

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#176

anybody live in Sacramento california and want to connect with blockchain?

#177

Wow, that makes me wonder about the vegans out there. Maybe it’s time to become a breath-airian. :stuck_out_tongue:

#178

When you speak of bitcoin programmers who are these people? How do you become one? How can we trust them to take the coin in the correct direction? You say Vitalik pitched his ideas to them but i thought Satoshi created the coin and it cannot be changed?

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#179

Hi, all - I do not use Facebook so was not able to leave a review. However, the course has been fantastic so far, the content and style, and the broad number of fellow crypto/blockchain enthusiasts/practitioners. I am learning a ton. Definitely recommend the course - 5/5.

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#180

In starting to research cyrptocurrencies and blockchain systems I ran across IOTA and Tangle. Seems like it could be the next evolution of blockchain (e.g. increasing transactions, reducing cost, mitigating the “quantum” issue/risk) or operating as another main mechanism for users when blockchain may not apply or be optimal. Any thoughts?

Interesting Paper
Increased Security & Access

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#181

You are crushing it! Keep up the good work.

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#182
  1. SHA-256
    2 because it takes too much computational time and resources. With SHA-256 you need to do 2^256 computations (in the worst case scenario for the hucker) or 2^255 (in the average scenario). Even its possible, it takes so long that make it useless by the nowdays computers. Perhaps with quantum computers no, but we have time to adapt…
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#183

It looks like a really cool way to present the course material at a quick glance.
Is it interactive?

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#184

I think one way of addressing Finality for retailer customers is to use Escrow.
When I learn more about smart contracts I’ll be able to say better, but I think using a retail smart contract utilizing escrow will circumvent some of the concerns with Finality and returning funds or reversing a transaction before it is recorded in the Blockchain…?