Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#605

  1. Why is it important that the blocks are cryptographically linked together?
    No one can change the data in previous blocks because they are linked by the hashing function.

  2. What does the block structure look like in bitcoin?

  3. The previous hash, transaction data, and the nonce.

1 Like
#606

  1. Having blocks cryptographically linked will ensure the integrity of all transaction data. If changes were made to a previously mined block, all subsequent blocks get invalidated and the proof of work will have to be carried out all over again. This ensures the security of the blockchain from issues like double spending.

  2. the block structure contains the hash of the previous block, the list of transaction data,and the nonce which is a random number the miner has to guess in order to solve a cryptographic puzzle in order to append the new block.

1 Like
#607

1.-
Is the essence of the blockchain. The hash of the new blocks is based on the value of the previous ones.

2.-
It is like a ledger.

1 Like
#608

Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
  • Because it increases the security of the whole system.
  1. What does the block structure look like in bitcoin?
    -It contains Nonce, data, previous hash and hash of this block.
1 Like
#609

1-for the security of the network once the blocks are on the network can be changed.
Example lbry once a video is on the network cant be removedā€¦so good on this age of censorship
2- Hash of the previous block, transactions nonce

1 Like
#610

Because it ensures that people donā€™t see a monetary incentive to go back and change the information in the blockchain becouse it would invalidate the subsequent transactions. This means that the incentive to change the information is reduced because the block would get dropped and the miner would not receive their reward.
2.
Hash from the previous block, transactions and nonce.

1 Like
#611
  1. Because it is impossible to go back in time and change the content of the blocks.
  2. Previous hash, hash, nonce, tx.
1 Like
#612

1* Because it prevents any alterations to any block as a change in one block would break the chain.
2* The structure of a block in bitcoin consists of transactions, the hash of previous block mined and the nonce along with the current block hash

1 Like
#613
  1. Its important so the blockchain preserves the data immutability/integrity in this way thereā€™s no way of double spending or other malicious transactions going through.
  2. block structure: previous hash, transaction list, nonce, hash of the current block
1 Like
#614

Why is it important that the blocks are cryptographically linked together?
To ensure the immutability, security and integrity of the blockchain

What does the block structure look like in bitcoin?
A Block is a hash of all transactions in the block, along with the nonce, and the previous blockā€™s hash

1 Like
#615

1. Why is it important that the blocks are cryptographically linked together?
It makes the blockchain virtually immutable. When you want to change one block, you have to change all the blocks that come after it and create new relations between the blocks.

2. What does the block structure look like in bitcoin?
Previous hash, transactions and nonce.

1 Like
#616
  1. this is important for security of the blockchain. nothing in one block can be changed without changing the other blocks which is not possible. the links are be broken then .
  2. the hash of a block is created from :
    Tx
    prev. hash
    nonce
1 Like
#617

1 So there can be assurance nothing in the past has changed

2 a link of hashes created from data and hash of previous graph

1 Like
#618

Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together? This ensures that the blocks remain immutable. It becomes very difficult to change previous blocks because it would break the chain and everything moving forward would need to be re-mined and you would need to catch and then surpass all the other miners that are on the original chain.
  2. What does the block structure look like in bitcoin? Previous block hash along with the current block data and the nounce that needs to be guessed/solved.
1 Like
#619
  1. Why is it important that the blocks are cryptographically linked together?

It is important for the blocks of a blockchain to be cryptographically linked together to secure the integrity of the blockchain. As a result of all blocks being linked together it makes it impossible to alter blocks without altering the chain.

2.What does the block structure look like in bitcoin?

In Bitcoin the block structure consists of;
Magic Number
Block Size
Block Header < Block version number, Previous hash, Merkle root hash, Timestamp, Target, Nonce
Transaction Counter
Transactions

1 Like
#620

  1. The fact that blocks are cryptographically linked together is so important because no one block can be tampered with alone. If one is altered, then all the following blocks will be altered, alerting everyone in the network. Makes tampering very difficulty.

  2. A bitcoin block structure consists of its own unique hash ā€œfingerprintā€ based on all of the transactions within that particular block, the hash from the previous block, and the random number or nonce that miners spend time and electricity to guess.

1 Like
#621
  1. Why is it important that the blocks are cryptographically linked together?ensure the whole system follow the rules
  2. What does the block structure look like in bitcoin?TX hashInputsOutputs
1 Like
#622

  1. Because of this a change in a previous block would result in a broken link and therefore all subsequent blocks would need to be mined again ā€”> Takes time / costs a fortune

  2. Each block has a unique hash which is computed with the following input:

  • the hash of the previous block,
  • the nonce and
  • all transactions
1 Like
#623

Glenn_CostaRica

1. Why is it important that the blocks are cryptographically linked together?
Because, in this way, data is protected by math and by the exponentially immense amount of work and energy necessary to modify the history of transactions. Cryptographically protected links represent invincible levels of security.

2. What does the block structure look like in bitcoin?
A block consists basically of the list of new transactions that this block will include in the blockchain, the hash of the previous block, the nonce, and the hash of the present block which will serve as link to the next block.

1 Like
#624

  1. Why is it important that the blocks are cryptographically linked together? This is to ensure that to create false blocks is so difficult and costly it is infeasible. This maintains the integrity of the blockchain.

  2. The structure of a block is:
    Block Number
    Nonce
    TX list
    Previous Hash
    Hash

1 Like