What is blockchain? How blockchain work?

[aepatio]

What is blockchain? How blockchain work? or Can someone share the link to explain these?

[jacee]

What is blockchain? How blockchain work? or Can someone share the link to explain these?

This article is a good read.  https://www.toptal.com/bitcoin/blockchain-technology-powering-bitcoin
Your welcome.

[tyagi]

https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&cad=rja&uact=8&ved=0ahUKEwirlZuzz-jNAhXBpY8KHb_SBbUQFggkMAI&url=https%3A%2F%2Fbitcoin.org%2Fen%2Fhow-it-works&usg=AFQjCNGeifAZydT5u6bqtH1nzSlWNz2E1Q&sig2=Quo8tLJk5tUgG-yhDtho4w&bvm=bv.126130881,d.c2I

[JesusHadAegis]

Blockchain is like you online bank. There are many so called banks in here and blockchain is just one of them. While real banks use cards or books or cheque, this things use "addresses" as a way of withdrawal or depositing. It has a good security protocol so you don't need to worry on what you would store to it. That is for blockchain. Others have different security protocols.

[bravehearth0319]

Blockchain is like a bank were you can put your bitcoins with wallet address were you can keep it there.
or in some other meaning its like a data structure that makes it possible to create a digital ledger of transactions.
Also blockchain works if you sign up first for you to have a chance to log in and then you can get wallet address were you can hold your coins.




 A

[serjent05]

The block chain is a shared public ledger on which the entire Bitcoin network relies. All confirmed transactions are included in the block chain. This way, Bitcoin wallets can calculate their spendable balance and new transactions can be verified to be spending bitcoins that are actually owned by the spender. The integrity and the chronological order of the block chain are enforced with cryptography.

You can read the full article here https://bitcoin.org/en/how-it-works

and the view of bitcoin block-chain here (block explorer) https://blockchain.info/

[mrblockchain]

Nice explanation.

The block chain is a shared public ledger on which the entire Bitcoin network relies. All confirmed transactions are included in the block chain. This way, Bitcoin wallets can calculate their spendable balance and new transactions can be verified to be spending bitcoins that are actually owned by the spender. The integrity and the chronological order of the block chain are enforced with cryptography.

You can read the full article here https://bitcoin.org/en/how-it-works

and the view of bitcoin block-chain here (block explorer) https://blockchain.info/

[Kprawn]

I will simplify it for you .... Take all the transactions that are being done on this network and put it online for everyone to see. Every transaction link to the next in a big chain and this chain can be

traced back to the first transaction ever made. {called the Genesis block} Nobody can delete any transaction, because it forms one giant chain or record of transactions that are stored on 1000's of

nodes around the world. All this is done, without the use of banks... 

[olubams]

What is blockchain? How blockchain work? or Can someone share the link to explain these?

In my own little way since I use block chain as my wallet, I will say its a virtual deposit box where you deposit your Bitcoin like a savings account and generate new addresses to receive money as you use different deposit slips like a conventional bank into that same savings account. Then when you need your money, you withdraw just like any other bank and there are some security measures put in place to protect your savings. However, you Dont receive alerts on your account as the banks but you have to log in to confirm what has been sent... My 2 cents...

[Karartma1]

Not a single reference is present into the Bitcoin White paper: it talks about blocks but not about a blockchain.

A blockchain is as simple as it seems a BLOCK CHAIN.

Every new block is attached to the preceding block thus creating a blockchain.

Is that difficult? I can't make it easier 

[Elwar]

Blockchain is the heart of Bitcoin.

Anything else you hear about blockchain is a scam.

[AgentofCoin]

Not a single reference is present into the Bitcoin White paper: it talks about blocks but not about a blockchain.
...

The whitepaper talks about blocks and talks about chains, and never puts the words together.
But Satoshi does talk about the "proof-of-work chain" in the paper, which is the blockchain.


This is my definition of a blockchain:

"A blockchain is a system to ensure validation of data throughout a public untrusted distributed ledger,
which is incentivized and secured through the process of mining."

[StoreBit]

blockchain is a type of line bank where you can put your bitcoin safely. in real band we need chick and ATM card or visa card. but blockchain do not need these this. it just need your add and you can access your account.

[AgentofCoin]

blockchain is a type of line bank where you can put your bitcoin safely. in real band we need chick and ATM card or visa card. but blockchain do not need these this. it just need your add and you can access your account.

Yeah... it isn't any of that.
So many things wrong with your answer.

[Elwar]

Blockchain (tm) coin is also a cryto-currency:

https://bitcointalk.org/index.php?topic=1437856.0

[Karartma1]

Not a single reference is present into the Bitcoin White paper: it talks about blocks but not about a blockchain.
...

The whitepaper talks about blocks and talks about chains, and never puts the words together.
But Satoshi does talk about the "proof-of-work chain" in the paper, which is the blockchain.


This is my definition of a blockchain:

"A blockchain is a system to ensure validation of data throughout a public untrusted distributed ledger,
which is incentivized and secured through the process of mining."

Yes, true. I was simply referring to the exact term "blockchain". It says what you noticed indeed but the word that today is becoming a huge hype was never mentioned that way inside the paper.

 

[groll]

According to this site http://blogs.wsj.com/cio/2016/02/02/cio-explainer-what-is-blockchain/

I will qoute it

" Known by many as the technology underpinning the bitcoin digital currency, blockchain has acquired a new identity in the enterprise. At a time when companies face new challenges in data management and security, it’s emerging as a way to let companies make and verify transactions on a network instantaneously without a central authority. "

"A blockchain is a data structure that makes it possible to create a digital ledger of transactions and share it among a distributed network of computers. It uses cryptography to allow each participant on the network to manipulate the ledger in a secure way without the need for a central authority."

Well just read the detailed things in that article. Hope this helps.

[Elwar]

[ameerrosic]

What is Blockchain Technology? A step-by-step guide than anyone can understand

http://blockgeeks.com/guides/what-is-blockchain-technology-a-step-by-step-guide-than-anyone-can-understand/


Picture a spreadsheet that is duplicated thousands of times across a network of computers. Then imagine that this network is designed to regularly update this spreadsheet and you have a basic understanding of the blockchain.

Information held on a blockchain exists as a shared — and continually reconciled — database. This is a way of using the network that has obvious benefits. The blockchain database isn’t stored in any single location, meaning the records it keeps are truly public and easily verifiable. No centralized version of this information exists for a hacker to corrupt. Hosted by millions of computers simultaneously, its data is accessible to anyone on the internet.

To go in deeper with the google spreadsheet analogy I would like you to read this piece from a blockchain specialist.

Blockchain as Google Docs
 

“The traditional way of sharing documents with collaboration is to send a Microsoft Word document to another recipient, and ask them to make revisions to it. The problem with that scenario is that you need to wait until receiving a return copy before you can see or make other changes, because you are locked out of editing it until the other person is done with it. That’s how databases work today. Two owners can’t be messing with the same record at once.That’s how banks maintain money balances and transfers; they briefly lock access (or decrease the balance) while they make a transfer, then update the other side, then re-open access (or update again).With Google Docs (or Google Sheets), both parties have access to the same document at the same time, and the single version of that document is always visible to both of them. It is like a shared ledger, but it is a shared document. The distributed part comes into play when sharing involves a number of people.

Imagine the number of legal documents that should be used that way. Instead of passing them to each other, losing track of versions, and not being in sync with the other version, why can’t *all* business documents become shared instead of transferred back and forth? So many types of legal contracts would be ideal for that kind of workflow.

You don’t need a blockchain to share documents, but the shared documents analogy is a powerful one.”

[AgentofCoin]

What is Blockchain Technology? A step-by-step guide than anyone can understand

http://blockgeeks.com/guides/what-is-blockchain-technology-a-step-by-step-guide-than-anyone-can-understand/
...

That above website does not even mention mining or consensus algorithms.
This site tried to explain the "innovation of the blockchain" without explaining how Satoshi made it function.

A blockchain is the "proof-of-work chain" that Satoshi stated in the whitepaper.
A blockchain is not just a distributed editable ledger, but also mining and tokens.