Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#3536

  1. It is important the the blocks are cryptographically linked together because it secures the blockchain with a mathematical puzzle that is based on all previous blocks. If a block is changed it breaks all blocks after that one.

  2. -Hash
    -Previous Hash
    -Tx List
    -Nonce

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#3537

  1. Because if anyone decides to change something in an old block, the link will break. It allows an honest chain of blocks, an honest and secure network.

  2. Previous hash, transactions list nonce, and current hash.

1 Like
#3538

  1. Why is it important that the block are cryptographically linked together?
    its important to prevent it anything from being altered or change.

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

  • data
  • previous block hash
  • nounce
1 Like
#3539
  1. Why is it important that the blocks are cryptographically linked together?
    To create an immutable chain of blocks to ensure a double spend is impossible (due to the interdependence between blocks & hashes), which, together with the huge number of mining nodes, secures the blockchain network.
  2. What does the block structure look like in bitcoin?
    It is composed of a header and hash, the transactions (data), and the block nonce.
1 Like
#3540

  1. It is very important in Blockchain that blocks should be linked together, without it the network isn’t secure. And without the link the next block cannot be formed. And link ensures the blocks to remain immutable.

  2. Hash of previous block + nuance + block header + transactions + hash of current block = Block

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#3542

1. Why is it important that the blocks are cryptographically linked together?
1.A. It creates a liner direction of traceability with each block relying on the others information integrity. This makes the chain state verifiable and can locate the point change using the hash header.

2. What does the block structure look like in bitcoin?
1.A. The Bitcoin blocks are made of the block number, nonce, Tx data, Perv hash and is linked to the next block in linear timestamp order and the correct puzzle hash. This resembles a blocks of data linked like a chain hence the term blockchain.

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#3543

  1. Why is it important that the blocks are cryptographically linked together?
    This is important to secure the integrity of the network, it ensures that TXs in previous blocks cannot be altered as it would break the link to the next block and all that follows, a domino effect.

  2. What does the block structure look like in bitcoin?
    The block structure of BTC = Previous blocks hash + current TX list/data + NONCE

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#3544

  1. Blocks being linked together prevents double spending as well as creates the security of which blockchain provides. This is what makes blockchain technology so appealing.

  2. Block structure has 3 elements in which each block are made of, The hash of the previous block in the chain, Transactions of the current block being mined, and the nonce of that block. All these factors must lead to a number lower than the target in order to be mined.

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#3545
  1. Why is it important that the blocks are cryptographically linked together?

It is important that the blocks are cryptographically linked together to help identify any transaction that is not correct and to reject that transaction immediately before it gets into the blockchain.

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

The block structure in bitcoin consists of the previous hash, the present transactions, and a nonce.

1 Like
#3546

  1. it is important blocks are cryptographically linked together, it creates a secure immutable transactions, in that blocks cannot be changed or altered.

  2. the block structure of bitcoin is a series of blocks containing transaction data, previous blocks hashed transactions and the nonce.

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#3547
  1. Why is it important that the blocks are cryptographically linked together?
    This ensures the stability and security of the system.
  2. What does the block structure look like in bitcoin?
    A block contains first a so called coinbase which is the reward of the miner and all of those transactions which the miner took into account (which are validated by other network nodes as well) into that block. Next to the transactions the block contains the previous hash and a so called nonce (random number) which are needed to calculate the current block hash.
1 Like
#3548

  1. Why is it important that the blocks are cryptographically linked together?
    Because this will make the blockchain a secure and immutable network.

  2. What does the block structure look like in bitcoin?
    The block structure of bitcoin consists of four elements:

  • The previous hash of the previous block
  • The transactions list
  • The nonce
  • By hashing and guessing the above the miners will generate a hash, or fingerprint of the block.
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#3549
  1. Each block shows proof of work and show consensus in the node network, also every block is time stamped and gives a unique fingerprint hash that are linked.
  2. The block has previous hash and tx list, with current hash and nonce to be guessed.
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#3550
  1. Cryptographically linking the blocks together ensures that if a block is corrupted, it would take a practically impossible amount of computing power and electricity to change all subsequent blocks and have them accepted by the network.
  2. Each block has three components:
    • Hash of previous block
    • Transaction list
    • Nonce (a random number picked by the miner)
1 Like
#3551
  1. Why is it important that the blocks are cryptographically linked together?
    It is important that the blocks are cryptographically linked together so that it is secure and must follow protocol. When they are all cryptographically linked it means that trying to alter any past transactions make it nearly impossible to become the newly accepted block because it will require an impossible amount of computing power in order to catch up the the new current longest blockchain. This will ensure that no one cheats the system and that the system is free of corruption or fake transactions.
  2. What does the block structure look like in bitcoin?
    The block structure looks like: a list of transactions, the previous hash, the nonce. This will create a new hash for that appended blockchain to be used for the next block in the blockchain.
1 Like
#3552
  1. To ensure the system is secure and transactions are not being altered in history.
  2. A block has the previous hash plus current transactions and the nonce (a random number)
1 Like
#3553

  1. This is is important because changing data in one block will change the hash output of all the blocks that are ahead of that block, thus needing to re-mine all of those blocks to meet a specific nonce target.

  2. The blocks contain various data within them. The hash output is based on all of that data. If one bit gets changed the hash function will be completely different. The next block will be based on the hash of a previous block and all of the data within the new block.

1 Like
#3554
  1. Why is it important that the blocks are cryptographically linked together?
  • To ensure immutability and integrity of the network/blockchain.
  1. What does the block structure look like in bitcoin?
  • Previous block’s hash, transactions list of current block and nonce.
1 Like
#3555

  1. It is important that blocks are cryptographically linked together to prevent changes in a previous block. The current block showing a previous hash provides the link that is immutable.

  2. The block structure in Bitcoin is:
    a) block number and size
    b) nonce
    c) data
    d) previous hash
    f) hash

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#3556
  1. To prevent malicious and bad actors to tamper with the blockchain. So the blockchain integrity is keep maintained in such an honest way.
  2. The header contains the previous block hash and nonce. The body contains the transaction list or the data.
1 Like