-
Important to prevent blocks form being altered because it will broke the chain and will have to remined every blocks which is impossible to do.
-
Bitcoin block contains:
Previous hash block
TX
Nonce
1 Like
-
To ensure security and integrity of the data within the blockchain, blocks being ‘linked’ or ‘chained’ means each new block is based in part on the previous one and so on. Without such linking, alteration of data would be more feasible.
-
The Block includes;
A. Magic Number
B. BlockSize
C. Block Header
C1. Version
C2. Merkle Root Hash
C3. Previous Block Hash
C4. Timestamp
C5. Difficulty Target
C6. Nonce
D. Transaction Counter
E. Transactions
1 Like
- Why is it important that the blocks are cryptographically linked together?
It insures the integrity of the blockchain, maintains security while also maintaining immutability of transactions. - What does the block structure look like in bitcoin?
The previous block hash, the current transaction list and the nonce guessed by the competing mineres which then will become the new block.
1 Like
- to secure the network and make sure no double spends etc
- block made up of prev hash, data, new hash and nonce
1 Like
1. Why is it important that the blocks are cryptographically linked together?
This is what creates the chain thus preventing attacks and changes to the blockchain (integrity).
2. What does the block structure look like in bitcoin?
The block contains metadata and transaction data. The metadata includes the previous block hash, a timestamp, the difficulty target and the nonce.
1 Like
- This raised the integrity of the chain. In one example it is that there can be no double spending.
- A combination: old hash, current block transaction, nonce
1 Like
-
Because a new block is based on the hash of the previous block in the blockchain. This is to secure the network and to make it difficult to change transactions in the previous block because then the links to the following blocks will then break.
-
A block structure is based on the hash of the previous block, the transactions in the current block and the nonce, which is the number the miner has to guess.
1 Like
- So it will be hard for anyone to alter the system, change one block and you have to remine everything
- Each block in the chain has its own Hash data and it’s based of all the transactions in the block, the nonce and the previous block’s hash. The miners have to guess the numbers until its less than the specific target.
1 Like
- Why is it important that the blocks are cryptographically linked together?
To ensure information on previous blocks being changed does not affect the new blocks. This creates a trustless system to keeps anyone from breaking the rules and changing numbers.
- What does the block structure look like in bitcoin?
New blocks contain the hash of the previous block plus the transactions contained in that block and the nonce that needs to be guess to create a link to a new block.
1 Like
1)Why is it important that the blocks are cryptographically linked together?
If someone change just one block all other block will get also changed, so it’s very secured to have all blocks linked together.
2)What does the block structure look like in bitcoin?
It contains previous hash+list of transactions+nonce =hash of current block
1 Like
- Why is it important that the blocks are cryptographically linked together?
- What does the block structure look like in bitcoin?
A.1. It is important that blocks are cryptographically linked together because each block contains the previous block Hash; hence the term Blockchain. This ensures data integrity through the PoW consensus protocol mechanism. Any attempt to violate the protocol—by removing or editing data—is immediately flagged on the network, therefore triggering a red alert. Bad actors end up losing their Bitcoins and possibly expelled from the network.
A.2. The block structure in Bitcoin contains the following fields:
- Block #:
- Nonce:
- Account balance & the name of the account’s owner
- Tx list
- Previous block Hash
- Current block Hash
Please refer to the following link: https://andersbrownworth.com/blockchain/coinbase
1 Like
- Why is it important that the blocks are cryptographically linked together?
Linked the blocks between them add more security to the network because it’s more difficult to change the data inside the blockchain. If someone change something that will change the hash of the block as much as the hash of the following blocks. If someone wants succed have to remake all the following hashes wich is nearly impossible.
- What does the block structure look like in bitcoin?
The structure of the block is composed of three aspects. The first aspect is the nonce which is a random number that gives a hash lower than the Target. The second aspect is the list of transactions coupling inside the block. The last aspect is the Hash of the previous block that link the new block to the entire structure of the blockchain. A graphic representation of this will be:
BLOCK #:
NONCE
+
LIST OF TRANSACTIONS
+
PREVIOUS HASH OF THE PREVIOUS BLCOK
=
HASH OF THE NEW BLOCK
1 Like
-
Because if someone try to modify a tx which is confirmed in a old block, then all the following blocks will be falsified and he needs to re-solve the puzzle in order to made permanent the change, and so it is extremely difficult and require a lot of hashrate.
-
A nonce, tx of the block, hash of the previous block and the hash of the current block.
1 Like
-
Why is it important that the blocks are cryptographically linked together?
Because of its high security immutability. -
What does the block structure look like in bitcoin?
You have a hash function then a copy of all listed transactions then a copy of previous hash transactions and then a selected nonce (random #) finally an output (your own unique copy) of the block.
1 Like
- To secure the network, so that transactions can’t be changed. If one tx is changed, then the whole chain would break.
- Each block has a unique hash number composed by the NONCE number (a random number) + the hash number of the previous block + a list of the TXs included in the block.
1 Like
-
To ensure security, each block’s hash wash calculates based on the previous hash, and if anyone tampers with the data on the previous block, it breaks the link to all subsequent blocks.
-
The block structure has the following:
- Block Hash
- Previous block hashed
- The nonce number
- Confirmed transactions
1 Like
-
Why is it important that the blocks are cryptographically linked together?
The blocks need to be linked together so that it is not possible to alter history, or change the data once its been added to the blockchain, this makes it immutable because the links themselves are built into the hashing of the blocks themselves. This provides integrity and security to the blockchain. -
What does the block structure look like in bitcoin?
A block includes, the transaction details in the block, the previous block hash, and a nonce - this all hashed together makes a unique hash itself.
1 Like
- It guarantees that everything upcoming and previous is same and cant be changed. Being linked and trying to change something in the middle means change to whole network.
- Previous hash, UTXO, fees, block reward, nonce, currenct hash
1 Like
-
It is important that blocks are cryptographically linked because if you change one block it changes the rest in the series. Making it impossible to change a block without breaking the chain. This chain then cant be practically mended. This makes sure the blockchains integrity is maintained.
-
The block is structured with the previous hash, the transaction and the nonce.
1 Like
1- Because it ensures that the block remains immutable.
2- The hash of the block is based on the transactions in the blocks plus the previous hash and the nonce that has to be guessed.
1 Like