- Because the network of computers have to agree with each other to determine what is true and not true. For example, in the Bitcoin blockchain the network of public ledgers (miners) have the incentive of money to root out the bad computations and work together to form an agreement on every SHA 256 transaction.
- A central database can be controlled by a single person or entity with little oversight. As we know, people can make mistakes and act maliciously. A network of computers reaching a consensus will help rid of potential fraud and malicious action.
- Consensus determines the truth of a transaction by all parties in the network confirming it is legitimate. They do this by checking if the sending has enough funds to send this amount, and making sure it makes sense, before completing the transaction. Outside of financial transactions, consensus means all parties come to an agreement on an outcome.
- The difference between blockchain consensus and central databases is the decentralization aspect of consensus. Data cannot be added to the blockchain unless everyone agrees. Central databases can just add whatever they want.
-
In the Blockchain, each transaction MUST be verified by multiple nodes in the network and they must ALL come to the same conclusion was to whether or not the transaction is valid before it is added to the chain.
-
The Blockchain is decentralized and the need for the concept of TRUST is removed. A Database is generally a centralized data store and is managed by a single authority or organization.
- In blockchain, consensus determines the truth by having the majority of the computers on that blockchain network all verifying that a transaction is correct.
- In a central database, trust cannot be verified because there is only one digital record set and therefore no other records sets can be used to achieve a consensus.
-
It means that all the nodes in the network agree to the transactions performed after verifying the UTXOs & signatures, it becomes truth and thus added to the blockchain.
-
In central database, there is no incentive provided to tell the truth and one can use it to exploit the situation for themselves and edit the data.
- consensus is important because all of the nodes that hold the ledger information need to check their information against the other nodes on the network to ensure that the information matches, and constant consensus leads to a more robust ledger.
- Truth in a central database can be determined by the person in charge of the database and can be changed by one person while changing anything on the blockchain required all nodes to come to an agreement on the changes. Also previous blocks can not be changed and if you try to change a previous block it will result in the blocks ahead of it be be invalid becuase the hashes wont match also making the ledger cryptographically hashed.
- we mean there is a distributed algorithm run by the nodes of the network that determines truth, and it’s called a ‘consensus algorithm’, like a voting-system
- in a centralized database, the clients simply trust the server, like citizens accepting government propaganda released from a centralized government–there is no distributed algorithm involved–although people might start talking to form their own distributed database when the central authority’s information starts to lose trust
What does it mean when we say that in blockchain, consensus determine the truth?
A blockchain is a peer to peer network with each node insentived to tell the truth because it procects their
own assets.
How is this different from how truth is determined in a central database?
In a centralized database consensus is achieved by a sinlge user with special privedldges.
The network must accept the new data in the blockchain using other computers.
In the central database, owner decides whether to accept the new data in database.
- What does it mean when we say that in blockchain, consensus determine the truth?
EVERYONE HAS TO BE IN AGREEMENT - How is this different from how truth is determined in a central database?
ONLY ONE ENTITY DETERMINES WHAT IS TRUE AND WHAT IS NOT
What does it mean when we say that in blockchain, consensus determine the truth?
Consensus determines the truth, as all information is easy to verify in the network
How is this different from how truth is determined in a central database?
Central database is trustless all information can be manipulated
1- It is mean that every one in the blockchain need to play by the rules, because everyone in the supply chain network wants to make the money , because consensus is build on top of incentive.Consensus is achieve thru financial intensive , people can gain money by being honest .
2-In central database there is just no incentive. Single subjects like people working for different businesses can do whatever they wants. They can cheat the rest of the supply chain and no one is able to check that in real time, when in blockchain we are able to check all in real time . Consensus in blockchain is removing trust ,when in central database all is working only on Trust.
1.What does it mean when we say that in blockchain, consensus determines the truth?
Consensus = is the verification of the truth and all have been played by the rules.
By achieving the consensus its impossible to cheat and then can be added on the blockchain
2.How is this different from how truth is determined in a central database?
In the central database, the truth would be determined by a central authority and can be manipulated by them. Everyone wants to make money, and the possibility to be false data is possible .Consensus is removing trust
1.It means that, all of the computers in the network agree that it is true and correct.
2.in a central database you need to trust a single entity where the truth is not easy to verify.
-
In a blockchain, consensus enables information sharing within a network of parties or companies involved to verify information, thus determining the truth.
-
In a central database, a single authority determines the truth and is able to manipulate data and information as he wishes.
- That the community validates the next block with the new transaction to be added to the blockchain.
- Central databases truth is determined by central authorities and they are the ones modifying the ledger according to what they believe to be true.
1. What does it mean when we say that in blockchain, consensus determine the truth?
It means that all the computers that are connected to the network need to agree (through mathematic equations) what is the truth.
2. How is this different from how truth is determined in a central database?
In a central database usually the people that have the authority can determine the “truth”.
- The public network is decided not by one person but by more than one of them. Everyone communicates with each other and makes decisions whether or not information will go to the blockchain. In the public network, the setting is that everyone wants to play fair. Why? - we all want to make money. If our preference is that we want to cheat we will not make money but lose it.
2.In the central data network, only one person or body decides what is true. Such a system is subject to fraud, manipulation, cheating and exploitation by people and society. What is visible in our daily lives.
- because all network participients have to play by the rules and only blocks/entries are accepted into the blockchain which do so.
- in a central database you have to trust the ones, that enter the data - while a blockchain is trustless
-
Having a consensus in blockchain means having strict regulations that act like a “Terms of service” in blockchain world.
If you agree to it, you have to “play” by the rules, and given the transparency of the blockchain, it is in everyone best interest to be truthful.
It is basically like a virtual senate, that’s totally anonymous, where instead of senators we have nodes/ledgers that are responsible to make a decision that’s best for everyone. -
Difference between centralized and decentralized database is mostly in level of hierarchy.
In central database, it’s usually one person or one side of the party that has all the control over the decisions.
Also central database is not as transparent, so there for people are not as motivated to obey the rules.