Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#3496

the blocks are cryptographically linked for greater security they cannot be changed or tampered with
the blocks are joined in a chain with each block containing the hash of the block before a list of transactions and a random number

1 Like
#3497
  1. Why is it important that the blocks are cryptographically linked together?
    • To ensure the mathematically formulaic integrity remains uncorrupted by errors and cheating.
  2. What does the block structure look like in bitcoin?
    • Transaction data, previous block hash and current block hash attempt of a nonce for block completion.
1 Like
#3498

  1. Why is it important that the blocks are cryptographically linked together? To ensure the integrity of the of the blocks therefore making them more secure.

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

1 Like
#3499

  1. The importance is given by the fact that if you try to change a block, you will have to rehash the others, which is very hard to do, although theoretically possible.

  2. Version - Previous hash - Merkle root hash - Timestamp - Target - Nonce - Block size - Block header - Transaction counter - Transactions

1 Like
#3500

Blockchains are cryptographically linked together to preserve the integrity of the blockchain and its development. Transactions may not be altered.

Bitcoin blockchain structure looks like blocks of transactions, SHA-256, hash from the previous block, and nonce generation connected by the cryptographic language developed for Bitcoin blockchain.

1 Like
#3501
  1. Why is it important that the blocks are cryptographically linked together?

It holds the integrity of the chain and keeps the system secure and trustless.

  1. What does the block structure look like in bitcoin?
  • Block name
  • Nonce
  • UTXO’s
  • Previous hash
  • Current hash
  • ‘mine’ button
1 Like
#3502
  1. Why is it important that the blocks are cryptographically linked together?

Cryptographically it important to link the network blockchan to keep integrity, secure and keeps the network involved.

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

The structure of a block chain has the Nonce, Data Transactions, the previous block hash, the newly created block hash, transaction fee, address to, address from and time and date.

1 Like
#3503

  1. Because it makes all the data on the blockchain immutable. You can’t change anything in a single block without having to change all subsequent blocks, which is basically impossible.

  2. The block structure includes the hash of the previous block, index number, time stamp, transactions, and the nonce.

1 Like
#3504
  1. Why is it important that the blocks are cryptographically linked together?

So there is not a change in a previous block. Immutability.

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

Block:
Nonce: ######
Data:
Previous: ################
Hash: ################

Mine

1 Like
#3505
  1. Why is it important that the blocks are cryptographically linked together?

Because this allows to see if Theres any error in the blockchain and allows the consensus algorithm to check each block so you only have to rely on math and physic’s to trust that the data wont be altered

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

Each hash is made from the prev hash the nonce and the transactions that are trying to be added into the current block

1 Like
#3506
  1. Why is it important that the blocks are cryptographically linked together? - To ensure that the chain is not altered in any way. If you make a change in any of the blocks of a chain, you will have to remind all the consecutive blocks. It is practically impossible (until they come up with a quantum computer :).
  2. What does the block structure look like in bitcoin? - A block consists of a hash of a previous block, a list of transactions, and a nonce.
1 Like
#3507
  1. Otherwise it’s easy to alter previous blocks, because you don’t have to mine all the later blocks for it.
  2. Block size, block header, transaction counter, transactions. Block header contains: previous hash, Merkle root, timestamp, difficulty target, nonce.
1 Like
#3508
  1. becouse its secure the network so nothing can be changed.
    2 the first block has a hash and some transactions and a nonce. the next block is the hash from the previus block + the blocks hash+ transactions+ nonse.
1 Like
#3509

1- it ensures the immutability of the blocks

2- there is a time stamp, Nonce, Transaction Data , Hash of the Previous Block , Hash of current block

1 Like
#3510
  1. Because all data is linked and created based on the previous data, so if any Previous data is changed, the whole chain will be changed and will “break”, becoming annulled.

2.Previous Hash + TX data + Nonce + Mining = New block’s Hash (that will be used for the following block hash

1 Like
#3511

1.Linking ensures immutability of the data on the blockchain. They can not be tempered with
2.The structure of the block contains:1. The Hash pf the previous block .2 The hash of the present block. 3. ,nonce. 4.Transactions that create the hash of the new block.

1 Like
#3512

1 - Blocks are cryptographically linked together to protect the integrity of the network. A change to one block breaks the integrity of the links to the subsequent blocks.

2 - Blocks consist of the previous block’s hash, a nonce (random number) and the transactions.

1 Like
#3513
  1. Why is it important that the blocks are cryptographically linked together?

Linking the blocks together prevents someone from changing data within an older block without it breaking the links between the blocks that followed the changed block. Since the hash function of all blocks are based in part on the hash of the previous block, a check and balance is in place to make sure no one can change data within an older block without paying the steep price of having to re-mine previously mined blocks.

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

A block contains transactions added by a miner. The block also contains the nonce that would have been used to solve the block. The chain is the cryptographic puzzle that needs to be solved. The block structure is a linear series of chains and blocks that connect one block to another one at a time.

1 Like
#3514
  1. So it makes it virtually impossible to go back and cheat the system.
  2. A block is a package data structure . According to Bitcoin Book, a block is a container data structure that clusters transactions for incorporation in the public ledger known as the blockchain. The block is composed of a header which includes metadata, accompanied by a lengthy record of transactions that advance its size.
1 Like
#3515
  1. Because by being linked together any change that is made to a previous block will automatically break the links between all subsequent blocks. Once these links are broken all the blocks would then need to be rehashed which is virtually impossible. This is a security feature that prevents transactions from being manipulated.

2.the block structure has the transactions/previous block hash/current block hash/nonce

1 Like