Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#4402
  1. It makes the network trustworthy through mathematics and poW. It is almost impossible to change as its all linked together like a puzzle.
  2. A block is compounded by: Current block hash, Previous block hash, transaction, Nonce.
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#4403

1 So that it’s secure and immutable.
2 The block number, the nonce, transaction data, hash of previous and current hash.

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#4404

  1. So that the blocks cannot be modified or changed; just new blocks can be added in the chain.

  2. A previous bloch hash, TX data and nonce.

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#4405
  1. This security measure helps prevent someone to go back and change data into one block, then every block that follows will also be modified as the previous hash now is not the same.
  2. A block is composed by: previous hash + Data transactions + Nonce
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#4406

  1. Blocks are cryptographically linked together:
    a. To ensure integrity in the network
    b. To increase security
    c. To ensure immutability

  2. Block structure:
    HASH of current block
    -hash of previous block
    -transaction list (data)
    -nonce (random no.)

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#4407

  1. It is important because it boost the security of the blockchain, and through proof of work allows the blockchain to be trustless.

  2. A block includes a hash of all the other blocks that have been accepted to the blockchain, a list of transactions that will be added, and the nonce that was guessed correctly.

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#4408

Homework on Blockchain and Mining Visually - Questions

  1. Why is it important that the blocks are cryptographically linked together?
  • This makes it difficult to change a transaction in the previous block.
  1. What does the block structure look like in bitcoin?
  • The transactions of the current block.
  • Nonce.
  • Previous hash.
  • Hash new block.
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#4409

  1. it means if some block is altered, all the forward blocks attached to the altered block needed to be re-mined with valid hash, which makes it impossible in practice to fake the transactions

  2. one block contains the data of transactions, the hash of previous hash, and the nonce number to be calculated to generate the valid hash for this block. new block will be only attached to the end of the blockchain that has the longest size

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#4410
  1. This helps prevent the data from being altered. Data immutability
  2. TX hash
    Inputs
    Outputs
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#4411

1- to make sure that no one can change any transaction in the block.

2-
a- Perv Hash
b- Txs
c- Nonce (Numbers that miners have to figure)

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#4412

1.So there is a immutable ledger,containing all blocks together,a chain of blocks,changing any of this data would break the blockchain.
2.the block structure contains the transaction data,hash of the previous block and a nonce, with this the current hash of the block can be calculated.

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#4413

  1. Why is it important that the blocks are cryptographically linked together?
    This makes it safer and incredibly difficult to alter as every hash would have to be calculated again if it was changed.

  2. What does the block structure look like in bitcoin?
    transaction list, hash of previous block and nonce

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#4414

1.) It’s important that the blocks are cryptographically linked together because it ensures security of the blockchain. Links connecting the next blocks can be broken if any transaction content is changed, which makes for an entire new cryptographic puzzle to be solved.
2.) Block structure of bitcoin:

  • Nonce
  • Transaction List
  • Hash of the Previous Block
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#4415

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

It is important so that we can be sure 100% of the time that transactions in the past have not being altered. Any change in a past block would change the resulting hashes for all blocks that followed.

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

A “block” in Bitcoin contains the following :

  • Hash of the previous block

  • Timestamp

  • Nonce

  • Transactions

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#4416
  1. Why is it important that the blocks are cryptographically linked together?
    It is important for data integrity, If the content in the block has been changes than the connection between the blocks breaks and the new connection created. It is important in order to be able to keep the transactions unique and trackable.
    2.What does the block structure look like in bitcoin?
    The block has a certain number and the size where transactions are being recorder and each block has hash attached (like a fingerprint) than the block is connected to the other block using nonce after the mining.
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#4417
  1. To secure the blockchain they are linked so that one block cannot be edited without mining all subsequent blocks
  2. current block hash (nonce, transaction data, previous hash)
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#4418
  1. Blocks are cryptographically linked together because they contain information from all previous blocks/ transactions that way making the network secure and transparent.
  2. The block consists of the previous hash, transaction list and nonce.
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#4419
  1. It is important for blocks to be cryptographically linked together to ensure less cheating in the system, creating better security for the entire chain.
  2. The block structure within bitcoin contains the previous existing hash, transactions, and nonce.
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#4420

  1. Why is it important that the blocks are cryptographically linked together? It insures the security of the blockchain, each hash is based off of the last, meaning all need to be changed if one is changed.

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

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#4421

1.This brings a certain immutability to the blockchain.
2.the block chain is made up from previous blocks in the chain (inputs,outputs,nonces.)

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