Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#162

[quote=“ivan, post:1, topic:8433”]
Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?

    • This assures if any prior data is changed all subsequent confirmed data becomes void.

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

    • Prior Hash
    • Transactions
    • Nonce
#163

  1. For the network to be secured.

  2. It will have Transaction data, nonce, block size and hash of previous block

#164
  1. Why is it important that the blocks are cryptographically linked together?
  • To ensure that it is IMPOSSIBLE to make any modifications in the previous blocks. Ensures the integrity of the data, we are writing in a “digital stone”
  1. What does the block structure look like in bitcoin?
  • Hash of the current block
  • Hash of the previous block
  • TX list
  • Nonce —> Hash all of the above again and the number should be lower than the Difficulty TARGET
#165

Hello there.

  1. Why is it important that the blocks are cryptographically linked together?
    To keep blockchain safe, increase security, ensure that block are immutable. Manipulating one block will result all of the next blocks chains invalid and broken.

2.What does the block structure look like in bitcoin?
Header
*version
*previousBlockHash
*merkle RootHash
*timestamp
*bits
*nonce

#166
  1. To insure integrity of the network.

2.each new block is appended to the blockchain using the previous hash along with new transactions and the nonce.

#167

Why is it important that the blocks are cryptographically linked together?
It is important that blocks are cryptographically linked together to keep them immutable. The link constraint proves block integrity.

What does the block structure look like in bitcoin?
The bitcoin block structure consists of the hash of the prior block, transactions and their hash, and a nonce that yields an acceptable new hash.

#168

  1. Having each Block intrinsically linked to the previous Hash fortifies the data integrity as any manipulation will change all subsequent Hashes.

  2. The current Hash is generated using:
    The previous Block Hash
    The Transactions in current Block
    A Nonce of an acceptable difficulty

#169

1. Why is it important that the blocks are cryptographically linked together?
This ensures that the system remains immutable, since the history of all blocks mined will be represented as a hash for any new block being added to the blockchain.

2. What does the block structure look like in bitcoin?
Previous blocks’ hash and the list of transactions for the current block.

#170

  1. It is important that the blocks are cryptographically linked together so that any changes in data are easily detected. If anything is altered, deleted or added to any given block in the blockchain, then that block and all following blocks will no longer make sense. Additionally, it takes an impossibly long amount of time to re-mine all of those blocks and then catch up to with all the new blocks that have been created in the amount of time it takes to correct the changes. This helps to maintain integrity and honesty within the mining process because it is counter productive to attempt successfully changing the blockchain.

  2. In bitcoin, the hash of the current block is made up of the hash of the previous block, the transactions on the current block and the nonce (random number which must be lower than the target number).

#171

  1. Immutability of the blockchain prevents data from being manipulated.

  2. Transactions hash, input then outputs.

#172

  1. It is important that blocks are cryptographically linked together because it prevents blocks from being altered, since changing one block would require the alteration of all subsequent blocks.

  2. The block structure in bitcoin looks like a table which contains the labels: Block, Nonce, Data, Previous, Hash, as well as data fields to contain the corresponding information, and a button to begin the mining process.

#173

  1. Why is it important that the blocks are cryptographically linked together?
    Is important for then safety of the blockchain. If i want to modify an older block the link between the block are broken so all blockchain broke and i heve to build again all the blockchain

  2. What does the block structure look like in bitcoin?
    One block have the txs, the previous hash and the nonce( number that miners have to guess in order to nine the block).

#174
  1. Why is it important that the blocks are cryptographically linked together?

All blocks (Bitcoin) produced on the blockchain being linked cryptographically ensure any previously produced blocks cannot be erased, tampered with or altered in any way without a massive – providing a certain level of immutability. Immutability can be challenged by attempting this but at such a great cost - energy to compute and attaining a 51% share of the network - that it is not actually worth it financially.

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

The block structure of Bitcoin consists of a time/date marker, all transactions being created in that particular block, the hash/fingerprint of the previous block and the nonce.

#175

1. Why is it important that the blocks are cryptographically linked together?
Because it will secure the data inserted on every block that have correlation from the previous block and the next to it.
Each block have appended which is the previous hash of the previous block in order to obtain the his unique hash based on previous block hash.

2. What does the block structure look like in bitcoin?
Previous block hash
BlockHeader
Blocksize
Transactions + transaction counter
Nonce

#176

  1. Because if one block is changed than all of the other blocks will be changed.

  2. Each block has a hash that is based on the transactions in that block and the hash of the prev block.

#177
  1. When the blocks are cryptographically linked together, it becomes harder for the miners to solve the puzzle. It becomes harder to change the contents of the blocks. Which makes the blockchain secure.
  2. Block number/id, Nonce, Transaction list, Previous block hash value, Current block Hash value
#178

1. Why is it important that the blocks are cryptographically linked together?

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

The block structure looks like a pdf that has in it :
The BlockNumber
The Previous Hash Number
The list with the transactions that are processed
The nonce
And it’s own Hashnumber

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#179 
**1. Why is it important that the blocks are cryptographically linked together?**

Having blocks linked together can ensure that there is almost no way to go back and change any data for any transactions for any reason. If that happens then the block that had the change of its data, looses the connection with the rest blocks of the chain and for a miner to get the link back its practically impossible. Basically he will must start a new procedure of solving the new puzzle with the new data so he can get his link back and he must also do this for all the blocks that follow the chain and the blocks that will be mined and added the chain.

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

A block structure in bitcoin must contain the transaction list, the data of the hash of the previous block and the right guessed nonce

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#180
  1. So that no one can change the history of transactions. No double spending is possible.
  2. A block includes previous block hash, transactions and the nonce.
#181
  • Why is it important that the blocks are cryptographically linked together?
    Miners have to be honest. If they are not and change something in previous blocks they have to re mine blocks while other miners don’t have to re-mine and add blocks to the blockchain and win the competition
  • What does the block structure look like in bitcoin?
    Blocks linked together via previous hash, transactions, nonce. This results in blochain propagated through the network of nodes.