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# Hello Steemians!

This is the **PhotoChain's Block Number 00002**.

![BLOCK00002.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/SYAoGLJh-BLOCK00002.jpg)

# 1.First: What is PhotoChain?

The *PhotoChain Challenge* is a blockchain-like photography contest. If you would like to know more about, read the [PhotoChain Challenge INTRODUCTION Post](https://steemit.com/contest/@davidesimoncini/photochain-challenge-the-blockchain-like-photography-contest). There, I explain the functioning of the contest and how to participate.

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# 2.PhotoChain as a Blockchain's Functioning

The cryptocurrencies ecosystem is born after the advent of the **blockchain** concept. With PhotoChain I would like to introduce some mechanisms which are commonly used in this functioning, trying to make them a little easier for those who are beginners. Obviously I do not want to create a blockchain course also because the fundamental pillar of this technology - and that here becomes impractical - is its distributed nature. Mine is just a slightly creative method and - I hope - an original way of getting used to some basics, all while having fun and growing on the Steem Platform.

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# 3.How?

Here I introduce the **Block** concept in the PhotoChain Challenge.

## In the cryptocurrencies ecosystem, every cryptocurrency is sustained by a *blockchain*. The blockchain is a modern technology: many computers from many countries work resolving calculations. Sometimes, the blockchain validates a **Block**: A *block* is a group of transactions - simply a list - where every *transaction* can be traced (there are exceptions in some types of cryptocurrencies focused on privacy).

So, the **first common point**: now we introduce the *Block* also in the *PhotoChain* Challenge. Here, the block will be a post I'll write that will contain a *group of pics*; particularly, **the photos of the winners for the previous 4 weeks of the contest**.

And here we are.

## On the blockchain, every computer can *guess* a ***nonce***, a kind of code that identifies the block, validating the block itself. Each of the computers that carry out these calculations is called ***miner*** - the concept is a bit more complex because a miner is a kind of account that can work even with multiple computers but, to understand the basics, what I said above is sufficient.

What's the nice thing? That every *miner* who guesses the *nonce* - that code that is associated with a block - receives a *cryptocurrency reward* generated by the blockchain.

## This whole scheme of work - which in computer science is called *algorithm* - is the so-called ***Proof of Work*** **(PoW)**: in a nutshell, computers hard work trying to find the nonce in order to earn the cryptocurrency reward.

Here is the second point in common: bringing the *Proof of Work* into it by likening the winning competitors to the miners who guessed the nonce. In this case, we can talk about a different algorithm, like ***Proof of Transaction*** - I invent it myself, you don't pay too much attention to it -. Here the miners who guessed the transaction, that is the winning photo, are rewarded.

And where does the prize come from? Using Steempeak to publish the post I have the possibility to choose *8 beneficiaries* that will be rewarded with a percentage of the value of the post in steem. Currently, I decided to set it at **11%**.

Let's summarize again: every 4 weeks I write the post - which will be the Photochain Block -. Each block will contain photos of the 8 winners in the previous 4 editions. At the time of the payment of the post 7 days after its publishing, each of them will receive 11% of the value of the post in steem.

### Total Beneficiaries Payout: 88%

![PHOTOCHAIN BANNER.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/tgLv8lj0-PHOTOCHAIN20BANNER.jpg)

[JOIN IN THE LAST EDITION!](https://steemit.com/hive-167922/@davidesimoncini/photochain-challenge-12th-edition-start-11th-edition-s-winners)


# 4.And the Rest?
The third concept. Considering that I am still a small little fish I would also like to have my part in the block validation and reward; I who created the contest and therefore I hold the rights over him: I, therefore, have the shares of the competition.

## There is a second basic algorithm in the cryptocurrencies ecosystem in which to validate the blocks and receive the rewards there are not the miners but the ***holders*** - or *hodlers* -, who hold the cryptocurrency and decides to *stake* it. In this type of work scheme, it is precisely those who hold this type of rights that goes to validate the blocks and earn the associated rewards: this algorithm is called ***Proof of Stake*** **(PoS)**

Taking this type of algorithm to our PhotoChain, 12% will go to me - and I must admit that this type of algorithm is very nice for me in a case like this :)

## In the crypto ecosystem, the set of algorithms *Proof of Work* and *Proof of Stake* is called a ***Hybrid System*** precisely because it unites both within the same work scheme. For some time now also various tribes here on steem have begun to use hybrid mechanisms to assign their tokens.

Finally, to sum up: I write the post - the block - which contains the photos of the winners of the previous 4 weeks; 7 days later the time for payment arrives; each author of the photo mentioned in the block receives 11% of the value of the post in steem for a total of 88%; I receive the remaining 12% reaching 100% of the value of the post.

All clear?

Last annotation: the **reward method** will be set to *50/50(steem/steem power)* and it must, however, be taken into account that on the value of the post all the curations that the steem blockchain independently deducts will be deducted. I currently have no power over the various tokens - and I don't know if they will be assigned automatically or not - I can only ensure you that in the event of rich arrivals I will undertake in the future to reinvest them if not all, almost.

And now: Ready? Go!

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# PHOTOCHAIN - BLOCK 00002

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![BLOCK00002.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/ES7ANdpp-BLOCK00002.jpg)

### - - -
## BLOCK 00002
### - - -


# Tx 01
A picture by @qwerrie
*with his grave perspective particularly interesting ;)*

![Win.0008.a.qwerrie.wall.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/ezOFHRY3-Win.0008.a.qwerrie.wall.jpg)

# Tx 02
A picture by @melinda010100
*with a crux in the middle of a little green area*

![Win.0008.b.melinda010100.green.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/nEBuh0LL-Win.0008.b.melinda010100.green.jpg)

# Tx 03
A picture by @dronegraphica
*with the view of a destroyed tree in the Lake District, UK*

![Win.0009.a.dronegraphica.destruction.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/vs7QeYAU-Win.0009.a.dronegraphica.destruction.jpg)

# Tx 04
by @qwerrie
*with a photo of a green wall in the middle of the city*

![Win.0009.b.qwerrie.graffiti.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/LZnitTuf-Win.0009.b.qwerrie.graffiti.jpg)

# Tx 05
A picture by @dronegraphica
*with a photo taken in the old mental hospital in Colchester*

![Win.0010.a.dronegraphica.door.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/x806Ec1u-Win.0010.a.dronegraphica.door.jpg)

# Tx 06
A picture by @melinda010100
*with an interesting example of destruction and a hearth painted on the rock*

![Win.0010.b.Melinda010100.heart.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/WYBt7zwa-Win.0010.b.Melinda010100.heart.jpg)

# Tx 07
A picture by @iamraincrystal
*with a cat at home behind a classical red heart*

![Win.0011.b.iamraincrystal.cat.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/QbUL5YGs-Win.0011.b.iamraincrystal.cat.jpg)

# Tx 08
A picture by @redheadpei
*with a foreground of a door in the house*

![Win.0011.b.redheadpei.hanger.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/NE3LLaXI-Win.0011.b.redheadpei.hanger.jpg)

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### Thank you all for participating in this challenge!
@qwerrie @melinda010100 @iamraincrystal @redheadpei @dronegraphica @wakeupkitty @libertycrypto27 @bucipuci @paradigm42
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![PhotoChain.jpg](https://files.steempeak.com/file/steempeak/davidesimoncini/Wnd2f5of-PhotoChain.jpg)

If you want to enter the block, you can join in the contest. I publish a new edition every week. Here the [Last Edition](https://steemit.com/hive-167922/@davidesimoncini/photochain-challenge-12th-edition-start-11th-edition-s-winners)

# I'll wait for you in the next Block, Steemians!

[JOIN THE DISCORD SERVER](https://discordapp.com/invite/PvZNsmv)

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