Homework on Blockchain and Mining Visually - Questions

Blockchain and Bitcoin 101
#2190

  1. It’s important because it Secures the Network, which is fundamentally key Bitcoin and
    the Blockchain.

  2. What does it look like? The image I have is of lots of DNA like molecules intertwined together to ensure it’s existence :joy:

When put into words it would be the current block’s hash wish consists of transactions and nonce aswell as the previous blocks hash.

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#2191
  1. Why is it important that the blocks are cryptographically linked together?
    So that it became impossible to alter the data without disturbin the chain.
  2. What does the block structure look like in bitcoin?
    Hash of the previous block
    Data
    Hash of the new block
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#2192

  1. Why is it important that the blocks are cryptographically linked together?
    This forces miners to work according to the rules because e.g. changing a past tx is prohibited that way.

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

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#2193
  1. Why is it important that the blocks are cryptographically linked together? So they can be added to the blockchain, and that they will be traced backed making hard for just anyone to change data within the block.

2.What does the block structure look like in bitcoin? So you have the hash of the previous block, a timestamp of when the block was added , all the transactions within that block and nounce.

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#2194

  1. It is extremely important that blocks are cryptographically linked together to insure network security, integrity, and that no double spending occurs.

  2. The structure of a block is based on the previous hash, transactions (data), and the nonce.

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#2195

1- all blocks are linked to each other by previous hash and new tx , this enshures that if any previous block would be changed than the link would be broken.
2-every new block added is hashed from previous has and new tx and creates a chain of blocks that depend on each others verfification.

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#2196

1. Why is it important that the blocks are cryptographically linked together?
In order to secure a stable and secure Blockchain, since changing Data in previous blocks would result in changes in all the blocks coming next. (The longest chain wins- PoW)

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

  • Block Number
  • Hash
  • Previous Hash
  • List of Transactions (Data)
  • Nonce
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#2197

  1. It is important that the Blocks are Cryptographically linked together so that if any one previous block has its data altered, the rest of the Blockchain will be broken. Alerting all the nodes that something is wrong and not rewarding the Miner that altered the Node.

  2. The block is made out of data, previous block hash, and a Nounce, The new Hash created from this input has to be below the Target. Which goes lower when more people are mining.

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#2198

  1. It is important they are cryptographically linked so that there will be difficulty in nefarious actions like double spending or making a change in the past blocks.

  2. Block has the hash (based off of previous hash, tx list, and nonce) as well as transactions to be made, block rewards, and block fees.

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#2199

  1. Why is it important that the blocks are cryptographically linked together?
    Each block’s hash is partly based on the hash of previous blocks. that is important so that it becomes extremely difficult to modify previous blocks/transaction.

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

  • Previous block’s hash
  • Nonce
  • Transaction List
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#2200

  1. Why is it important that the blocks are cryptographically linked together?
    To ensure security of the network.

  2. What does the block structure look like in bitcoin?
    Block, data, previous hash, nonce and block hash.

Please correct me if any responses are incorrect.

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#2201
  1. It is important that blocks are cryptographically linked together as it gives immense security and that no tampering with previous data can happen unnoticed as one slight change in the data of any block would break all other links between blocks infront of that tampered with block.
  2. The block structure of bitcoin contains the hash of the previous block the transactions list (inputs and outputs) and the nonce, which is a guessed number by the miner that is hashed to form another number that if that number falls below the set target difficulty parameter creates the hash of that block which is then accepted as the new block and then the process repeats for the next block .
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#2202

  1. Why is it important that the blocks are cryptographically linked together?
    It is important that the blocks are cryptographically linked together because it makes it virtually impossible to change a block. If a change occurs one block, you have to change all the blocks and create new hashed relations between the blocks, which is impossible.

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

The head of the block is divided into six components :

  • the version number of the software.
  • the hash of the previous block .
  • the root hash of the Merkle tree.
  • the time in seconds since 1970–01–01 T00: 00 UTC.
  • the goal of the current difficulty.
  • the nonce.
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#2203
  1. Why is it important that the blocks are cryptographically linked together?

This makes it harder to change the data of a block. If one block is changed all the other blocks will be changed to making the cryptographic puzzle incorrect.

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

The Hash of the previous block, the list of transactions, the nonce and the block hash.

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#2204

Q1: Why is it important that the blocks are cryptographically linked together?

Q2: What does the block structure look like in bitcoin?

A1: To prevent past transactions from being modified. If they are changed, the link will break.
A2: previous block hash, tx (data), nonce

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#2205
  1. To have an integrity and security of the blockchain.
  2. Nonce, hash, mining, blockchain, input & outputs.
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#2206

  1. This plays into the concept of finality and immutability. It ensures that you can’t realistically go back and change any of the transactions or data that have occurred.

  2. Hash of the previous block, transaction list, and a nonce that is generated.

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#2207
  1. Why is it important that the blocks are cryptographically linked together?
  • It is important to cryptographically link each block together in order for the security and integrity of the blockchain. This linking makes it impossibly hard for anyone to go back and change previous blocks because this act will cause all other subsequent blocks to get invalidated.
  1. What does the block structure look like in bitcoin?
  • The Bitcoin block which is essentially a container data structure is comprised of the Block Header which contains metadata such as the reference to a previous hash, the nonce, the difficulty, the timestamp etc…followed by a list of all the Included Transactions that make up the bulk of its size.
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#2208
  1. To ensure integrity and security
    2.Block structure consists of
    The previous block’s hash
    the list of transactions
    the nonce
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#2209

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

  • So they cant be tampered with or changed. It would not be secure without cryptography.
  1. What does the block structure look like in bitcoin?
    • It has a nonce that is being calculated to solve the puzzle, it has a hash from the previous block, it has a hash created that is unique for current block and it has the transactions in it.
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