Homework on Stale Blocks

Blockchain and Bitcoin 101
#3270
  1. Two different versions of the blockchain are propagated.
  2. When a block exists on a version of the blockchain that is superseded by a longer version, the blocks that are invalidated are said to be stable blocks.
  3. Stale blocks occur when the blockchain diverges, causing two versions to broadcast. If a node receives one version of the blockchain, and then a longer version that doesn’t contain all the same blocks as the most recent blockchain on the node, the mismatched blocks from the smaller chain will become stale blocks.
  4. You don’t want to base the transaction on a block that may become stale.
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#3271
  1. If two miners solve the block at the same time then the chain that soon grows the longest will orphan one of the simultaneous blocks
  2. A stale block is one that was orphaned
  3. Stale blocks occur when the miners mine the same block at the same time
    4 beat to wait for multiple confirmations just in case the transaction you have gets into a block that gets orphaned
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#3272
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    One of those will become stale block. It depends on the next block mined which will win and considered to be the real blockchain.
  2. What is a stale block? It’s a normal block that will not be included in the blockchain, because another block gets added on the blockchain simultaneously and happens to create longer blockchain quicker. Stale block goes back to mempool.
  3. How do stale blocks occur? When to blocks are mined at the same time.
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction? In case your transaction will be on a stale block that will not be included in the blockchain and goes to mempool to wait the transaction to happen. You should wait 6 confirmed blocks to make sure your transaction is in the blockchain.
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#3273
  1. Basically the blockchain splits in 2 chains for a while with people mining on 2 different blocks (the first one they receive). Eventually the longest chain wins out and the other chain is disregarded.
  2. Stale blocks are blocks that are no longer part of the blockchain since the longest chain wins.
  3. After a fork, there are 2 versions of truth, eventually one wins and the blocks on the other chain become stale blocks.
  4. It’s only after several blocks that you can be certain you are on the longest chain that is accepted and the transactions are confirmed. If you have a transaction in a stale block, it will return to the mempool.
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#3274
  1. What happens in the bitcoin network when two miners solve a block at the same time?

The decision on which block will be added to the blockchain totally depends on all other miners in the network. Both blocks will broadcast proof at the same time but whoever gets the most confirmations and the block with the longest chain will be added to the blockchain. The black that loses will return to the mempool.

  1. What is a stale block?

A stale block, even called an orphan block, is a block that is not accepted into the blockchain. A block that is dropped back to the mempool in favor of another block that got the most confirmation and got added to the blockchain.

  1. How do stale blocks occur?

When two miners solve a block simultaneously. The nodes try to decide which block of the two blocks it wants to accept.

  1. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

To ensure that your transaction don’t end up in a stale block.

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#3275

  1. On the Bitcoin network when two miners solve a block at the same time there are briefly two versions of truth until the longest chain wins and is propagated.

  2. A stale block is a valid block discarded from the blockchain because it was not a part of the longest chain in the network.

  3. Stale blocks occur when valid blocks are a version of the truth that is not accepted by the network because it was not part of the longest chain.

  4. Your transaction might be in a stale block and dropped from the blockchain.

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#3276

  1. When two miners solve a block at the same time the block will be broadcasted into the network and could co exist at the same time for a short period of time .

  2. A Stale block is a Block that has been dropped or abandoned during the creation of the next block

  3. Stale blocks occur when 2 versions of the block exists on the network , a miner picks up only one version of the block chain from the network and so this produces a longer chain which means more POW ! The other version of the block is a stale block ,it gets abandoned and the transaction lists ae sent back to the mempool.

  4. It is important to wait for more than one block to be confirmed at best we should wait for 6 confirmations , to atlas ensure that the block has been fully propagated to the network and that it does not belong to the blocks that might be dropped ,

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#3277 
What happens in the bitcoin network when two miners solve a block at the same time? 2 new blocks will be broadcasted to the network and some nodes can use one of the block and other another block for some time
What is a stale block?

Block which was dropped and later cancelled from blockchain
How do stale blocks occur?
When there are 2 blocks mined at the same time and later on just one block is chosen by network (the one which created longer blockchain).
Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
To be sure that our block is not a part of stale blocks

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#3278

1. What happens in the bitcoin network when two miners solve a block at the same time?
Both blocks become valid in terms of the miners both hit a hash below the target. The nodes that each miner used contain the block on the blockchain that they mined so for a short period of time some nodes on the network contain different data. Then the network will choose the block that has the most proof of work the biggest in terms of difficulty usually because another miner will append another block on it and the other block from the other miner gets returned to the mempool. Then all nodes on the network get updated on what block has been appended to the blockchain .

2. What is a stale block?
Stale blocks are blocks that were on the blockchain at one time but then got dropped because the blockchain accepted another version of blockchain that did not have those blocks in them. They are also called orphan blocks. Orphan or stale blocks pay nothing. (No transaction fees, nor block reward fees).

3. How do stale blocks occur?
Two minors solve a block at the same time and the network accepts the bigger block in terms of difficulty in solving them not by size.

4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

Because the block with your transactions could be dropped and not appended to the blockchain if the network accepts other blocks to append to the blockchain. For example, if two miners mine a block at the same time the network will append the longer block that has more difficulty too than other miners choose to append their blocks on. It is to assure that your block does not become a stale block.

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#3279

  1. The block with the most proof of work will be selected and rewarded and created. The longest blockchain with the most work wins.

  2. A block that has not been selected by the network because it was shorter chain.

  3. When 2 miners solve a block at the same time and the one miner block is selected the other block becomes stale.

  4. to see if the chain has been accepted by the network. in case of a stale block occuring

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#3280
  1. The chain forks temporarily
  2. A block that gets put back into mempool in favor of chain with more POW
  3. Stale blocks occur after a fork is resolved with a longer chain
  4. In case of a stale block occurring.
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#3281

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    The one with the more extensive proof of work basically is selected for the block, the other miner’s work becomes stale or an orphan.

  2. What is a stale block?
    It is an orphan block, rejected and not eligible to get the reward/paid

  3. How do stale blocks occur?
    When 2 miners strive to solve for a block at the same time, the one who is quicker/better proof of work is accepted and therefore gets paid. The “loser” is rejected and not accepted into the blockchain

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    One would want to ensure that the transaction was actually confirmed by multiple (6) confirmations to ensure that it wasn’t dropped or returned to the mem pool.

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#3282
  1. What happens in the bitcoin network when two miners solve a block at the same time?
  2. What is a stale block?
  3. How do stale blocks occur?
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

1.Each propagate their block to the network of nodes and eventually 1 will be chosen and the other one dropped.
2.A valid block that got dropped.
3.By being the block that got dropped, because it wasn’t the longest chain with proof of work.
4.To be sure you won’t get dropped and become a stale block.

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#3283

Homework on Stale Blocks
1-the closest node for each miner will have their blocks so we will have 2 versions of the blockchain.
2- This is a valid block but it is removed for having less confirmation in the network.
3- when a block has less confirmation over the network always will choose the longest blockchain based on PoW.
4-this will ensure that your block won’t be dropped down from the blockchain due to a low number of confirmations.

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#3284
  1. Both blocks will be added to the blockchain and the one that ends up with more successive blocks the fastest will become the winner.
  2. That’s when a valid block is not accepted as the truth as more blocks are added to the competing one in succession
  3. When by chance, newer valid blocks are added to the competing block and win out as the longer blockchain
  4. just so as to make sure the confirmed block does not become a stale block.
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#3285
  1. If 2 miners, A-B, solve the block at the same time, then both will launch it at the same time. As block A has reached a higher number of blocks chained ti it, then that will eventually win and become the one to follow. Block B gets dropped and becomes stale or orphaned.
  2. It’s a block that was once successfully mined, but was then not included on the current longest running chain.
  3. It occurs as 2 blocks are solved at the same time, giving 2 version of truth. The stale block it’s then dropped as the longest running chain overtakes it.
  4. Best practice would be to wait for at least 6 confirmed blocks, this is because if it is only five, we can then run the risk to attach the block to a stale or orphaned chain.
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#3286

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    Those will blocks will be propagated in the network and new blocks will be added to them, if there is two versions of the blockchain, the longest will continue and the shorter droped.

  2. What is a stale block?
    a stale block is a block that was droped because it was in a shorter blockchain that was propagating as the same time.

  3. How do stale blocks occur?
    stale blocks occur when 2 or more chains are being propagated at the same time and the shorter will be dropped creating stale blocks that return to the mem pool.

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

because it can be possible that 2 versions or more of the blockchain exist and the transaction will be dropped. Being required to be mined again for the following blocks

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#3287
  1. What happens in the bitcoin network when two miners solve a block at the same time?

-The two blocks will compete with each other, the blockchain network will pick the block with the longest chain.

  1. What is a stale block?
    -A stale block is a block that was in the blockchain before but it has been putting back into mempool again.

  2. How do stale blocks occur?
    -It is because that the blockchain chooses the longest chain, which the blocks are at a short-chain will be putting back in mempool.

  3. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    -To know if your block will not return to the mempool

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#3288
  1. the block that is more difficult and also if the block is now a longer chain will be accepted and the other block will become stale , returning all its TX to the Mempool.
  2. A stale block is a block that is valid and correct but not been accepted because another a block has been accepted, causing it to no longer be needed.
  3. Stale block occur when more than one block has appended at the same time to the blockchain, the block that has less difficulty will be dropped.
  4. its important to wait, to give time for block chain to settle consensus.
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#3289
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    Both blocks are broadcast to the nodes which are then picked up by miners. Depending which chain gets picked up by the next miner will continue or droped
  2. What is a stale block?
    A valid block that was once in the block but its dropped as there is another valid chain with more PoW
  3. How do stale blocks occur?
    More than one valid block is attached to the chain
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    To make sure that the transaction is confirmed and not dropped later due to a fork
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