# <center>1st Week</center>

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## Tuesday, July 2nd 2019
Make Pre-internship summary for Prof. RT Wang
[Click this to view the presentation](https://drive.google.com/file/d/1CQWh4zR5A5XF8tTfMEtcUzej6DdzQHng/view?usp=sharing)

Meet Mr.Denny at 3.00PM
- Crosscheck the slide summary
- Discuss blockchain statusquo
- IOTA issue about centralization
- Look for blockchain technical forum in telegram or website

## Wednesday, July 3rd 2019
Make Introduction
[Click this to view the presentation](https://drive.google.com/file/d/14E5P2WGnx-pHZJnFHCGGe16z9SINttvA/view?usp=sharing)

Meet Professor RT Wang at 10.30AM
- Present Pre-Internship progress
- Discuss internship goals
- Discuss Jobdesc
- Cooperate with Achmad Fathur Rizki about DDS Technology
- Create a group discussion between Ken and Tiffany (Prof RT Wang Student)

Welcoming Party at 2 PM
- Introduction to everybody

3.10 PM
Search for reference blockchain about Decentralized Pub/Sub and How to Installing IOTA
Prepare for tomorrow discussion with professor
- join discord IOTA discord
- Reference
1. https://medium.com/nknetwork/introducing-decentralized-pub-sub-based-on-nkn-1036a950360d
2. [HyperSub](http://msrg.org/publications/pdf_files/2017/hyperpubsub-mw-HyperPubSub:_a_Decentralized,_.pdf)
3. https://iota.partners/
4. https://discord.iota.org/
## Thursday, July 4th 2019

IOTA Clear Slides for meeting
[Prepared Presentation](https://drive.google.com/file/d/1FoywpmHptMUi5klTTOVYpZbJIr5rJfKi/view?usp=sharing)

Meeting at 11.30AM with Prof. RT Wang, Mr. Denny and the team

### key meetings:
- discuss Blockchain
- discuss expected internship goals

> Results of the discussion:
> Fathur goals:
> 1. Create a pattern in DDS to combine it with blockchain.
> 2. Modify some code from DDS and put it into open source.
>
> For Vincent:
> 1. Contribute own blockchain idea to open source.
> 2. Implement blockchain into IoT.
> 3. Find a solution about issues of offline verification in blockchain.
>
> Presentation from Ken team:
> 1. They create 2nd hand of equipment trading system to blockchain (platform to exchange sell and buy goods) as a solution to traditional way.
> 2. They also presented us about Blockchain and Bitcoin.

**Install Ubuntu Server**

Minimum requirement for the Virtual Private Server:
- 2 Cores and 4 GB RAM
- recommended SSD hard disk
- Ubuntu Server installation 18.04 or higher
- SSH access with a key or password
- a public IP address


SSH Configuration
1. Install Putty
2. Install SSH on the ubuntu server
3. Change from NAT to Bridge in the settings of server

4. Check the ip address

5. Open Putty to SSH the network

6. Insert the id and password

Learn IRI
https://docs.iota.org/docs/iri/0.1/how-to-guides/run-an-iri-node-on-linux

## Friday, July 5th 2019

PoW (Proof of Work)
>PoW is the answer to a mathematical problem that's difficult to calculate, but easy to verify. In IOTA, proof of work protects the network from spam transactions. Each transaction in a bundle must include a proof of work to be valid.
Proof of work (PoW) is calculated using trial and error, therefore it requires the use of computational power.

>**PoW in IOTA**
each transaction must include a PoW before it can be validated. This PoW provides spam protection for an IOTA network by increasing the time and computational power it takes to create a valid transaction. the nodes will ignore transactions that don't contain a valid PoW.
PoW can be done by clients or it can be outsourced to a node (known as remote proof of work) by calling the attachtoTangle.

>**How Proof of Work is calculated**
>the content of transaction are converted from trytes to trits, then those trits are hashed to result in a transaction hash.
>Transaction hash:
>- Bundle Hash: Hash that's calculated using the address, obsoleteTag, timestamp, value, currentIndex, and listindex
>- signature: Signature of the transaction (if it withdraws IOTA tokens from an address)
>- Trunk transaction and branch transaction: Two transactions that the transaction references and approves

A trit is a digit in a base 3 number system: either 0,1, or 2

A tryte consists of 3 trits. It can be in one of 27 states. In IOTA these states are often named with the (26) uppercase letters ABCDEFGHIJKLMNOPQRSTUVWXYZ and the (+1) number 9.

The function that calculates PoW is called the PearlDiver.

**Meeting at 1.30 PM with Professor RT Wang and the team**
### Key Meeting:
- Job to be done for next week
### Outcome Discussion:
- Focus on blockchain what really important for IoT to be implemented with blockchain
- Offline Verification
- Modify some source code of the blockchain or the pattern for a new concept
- Build a node with AWS cloud