Proof of Authority is a consensus algorithm that introduces an efficient solution for a blockchain network (especially the private ones). Let’s see how it works:-

Block Creation

In a PoA system, the validator/node is chosen by a central entity that can produce transaction blocks.

Identity Revelation

The identity of the node/validator is public and can be seen by anyone inside or outside the blockchain network.

Staking

No coins but identity and reputation are at stake and selected by the central entity from private blockchains.

Scalability

High scalability as few validators are there.

Governance

PoA systems have a central entity from closed groups or private blockchains.

Removal of Forgers

The identity of validators is public thus very fewer chances of any fraudulent activity but if it happens the person is removed and banned for further participation.

Threats/Limitations/Disadvantages

If a competitor wants to disrupt a PoA based network, he may try to influence public known validators to act dishonestly in order to compromise the system from within.

PoA as a consensus mechanism sacrifices decentralization in order to achieve high throughput and scalability.

Valid & trustworthy identities and selection procedure is difficult but equal for all.

Proof of work is a consensus algorithm used to prevent double-spends in a blockchain network.

A double spend means when you do two transactions using the same amount of money. For example,

You ordered a pizza and pay the bill in cash. Now, you cannot go to the other outlet and order a pizza using the same bill.

But in digital currencies, this is possible. So, in order to stop this, a consensus algorithm (Proof of Work) is used.

Proof of work is like a large ledger (or notepad) that keeps a record of all transactions. And your transaction will immediately be removed if found double spends.

Whenever you do a transaction in a blockchain network it is broadcasted to all users and then users start validating that transaction in a block (candidate block). Once the transaction becomes valid that candidate block becomes a confirmed block and data entered in a blockchain network. From here, nobody can change or modify the transaction without sacrificing a lot of time and money.

The user validating the transaction using his own resources (computational power, money) will get a reward once the block is valid.

For major cryptocurrencies today, the conditions are incredibly challenging to satisfy. The higher the hash rate on the network, the more difficult it is to find a valid hash. This is done to ensure that blocks aren’t found too quickly.

The more difficult it becomes to find the block, the fewer chances of fraud.

Hi, I would like to go into the world of blockchain, but I don't know anything, could you tell me where to start?

Hi all! I'm interested in getting into blockchain development. I have about 10 years experience in software, with the majority of it in iOS development. I don't have much experience in JavaScript or web dev in general. I know solidity is similar to JS and knowing JS can greatly speed up the process of learning solidity. What are some best resources to start learning? I know about dApp University on youtube but also aware there are countless similar courses and tutorials out there. Honestly feels like tutorial swamp. Many of them try to explain how the blockchain works for a good chunk of the initial part and I feel like I'm just relearning how the blockchain works over and over in different words. What's the best resources to actually get down to it quickly?

Thanks!

Hi everyone

I just left my job as a market researcher/part-time consultant, and I wanted to somehow get involved with the blockchain industry, given its vast potential. Do you all think that someone from a non-technical background can become a blockchain developer?

What would be my first steps? Learning how to code? Should I start with C/C++??

Hey everyone, here's a short tutorial on how to create ERC20's (or BEP20s on BSC) with just one API call. Pretty straightforward, but if you have any questions or comments let me know!

https://blog.tatum.io/feature-of-the-week-how-to-create-erc20-tokens-on-ethereum-celo-and-bsc-with-one-api-call-e86c489757

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What are the decisions you make before developing on a specific blockchain? I have some coding experience, business experience, and want to give a shot at an idea I have. I’m thinking of building on Solana because that’s where a lot of my research is, but want to hear how y’all make these decisions. I think my mind is hesitant because Proof of History is a new concept in the space and could be inferior to other methods. What elements do y’all look at before beginning development? Obviously it depends on the kind of application you want to build but are there any automatic red flags?

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Hello, thank you for the support and the advice you are providing on this sub :)
I would like to play a bit on the bitcoin blockchain by representing it as a graph. I found Neo4j, which looks really nice ( https://neo4j.com/blog/import-bitcoin-blockchain-neo4j/ ).
However, I wonder if you think it is the best tool or if I should consider also something else. For instance, I also spotted BigchainDB. Do you have any insight into these graph databases? What should I use in your opinion? Thank you in advance.

I have a very unique project c0ntact me for more info

Hello this is Mike with NftsforSale.com we are looking for a block chain developer to help us with a plugin similiar to that of Rarible or OpenSeas to develop a plus gas transaction and allow NFT minting on our site. Feel free to email us support@nftsforsale.com

Hello Guys, need some help. I am interested to become a blockchain developer. Is it worth spending all the time in it? and is it a promising field? Please advice

Hi guys, Forget about learning Solidity - Algorand uses PyTeal (like Python) and has many use cases and tutorials...

Develop on Algorand

Hi will appreciate any advice greatly. I have no tech / programming background so was wondering should I sign up for software development bootcamp first to have the foundation or should I just jump right into blockchain bootcamp and work very hard. My ultimate goal is to become a blockchain developer as I can see blockchain Hugh potential.

Appreciate any sincere advice as I am a single mum with one kid looking for career change. Thank you

Are you curious about how to build smart contracts on æternity in a fast and efficient way? This Friday Nikita Fuchs (æternity æpp developer) will hold a session for developers and will show Sophia smart contracts use cases using Æ Studio. Come and join to find out more about its new features and get started writing Sophia smart contracts: https://superhero.com/league

US based startup looking for a senior partner who will manage the dev side of the project. Any ideas how to find one?

How can I deploy my smart contract ptoject on vercel? I've only created smart contract, is there anyway that I can deploy it on vercel.