Homework on Stale Blocks

Blockchain and Bitcoin 101
#4555

  • The blocks will compete until the network “chooses” a winner - usually the longest (thinking in difficult terms; thinking about the one chain that has the most PoW) -; then the other is droped and the transactions return to mempool

  • It’s the blocks that was in the loser chain

  • When two miners solve a block at the same time and the information doesn’t spread through the network at the same time. So the new chains will compete until there’s only one version of the truth again

  • To avoid stale blocks

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#4556

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    The network will temporary create 2 chains and start popagating it. After sometime only one of the 2 chains will win, the longest chain. The other will be invalidated.

  2. What is a stale block?
    A block that is being drop because it’s not part of the longer chain. This block is sent back to the mempool.

  3. How do stale blocks occur?
    When the block is mined at the same time by 2 miners, and it’s not part of the longer chain.

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    To be sure your transaction is on the longer chain. You have to wait 6 confirmations blocks to be sure your transaction is valid on the network.

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#4557
  1. What happens in the bitcoin network when two miners solve a block at the same time?
  • Both will be added to the blockchain, later the longer chain (after more blocks are added) will be kept and the other (stale) will be discarded and the data in it added to the mempool.
  1. What is a stale block?
  • a block that was mined and propagated but later discarded as another chain was solved at the same time

  1. How do stale blocks occur?

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

  • to make sure if another block was mined at the same time and yours may become stale
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#4558

  1. If two miners solve a blocks at same time it depends on next miner which block he chooses

  2. The left over block with shortest chain is stale block

  3. They occur when they are not the longest chain which they are leftovers

  4. Because they are not leftovers as a stale blockchain

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#4559 
What happens in the bitcoin network when two miners solve a block at the same time?

The block in the longest chain wins and the other block is dropped and is considered a stale block. All of the transactions will be dumped into the mempool.
What is a stale block?
A stale block is a block that was successfully mined but isn’t included in the “better” block chain.
How do stale blocks occur?
When there are 2 miners who successfully mine a block at the same time, the best one wins and other gets dropped.
Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
To ensure that block that the transaction was included on isn’t a stale block.

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#4560
  1. What happens in the bitcoin network when two miners solve a block at the same time?

They each begin propagating their version of the blockchain to other nodes. This results in all nodes having a different version of the blockchain. When other miners begin mining based on whichever version of the blockchain they had access to one of the two chains will eventually become longer and will become the new valid chain. This new chain is propagated and transactions present in the other chain are returned to the mempool.

  1. What is a stale block?

A block that had its transaction data returned to the mempool.

  1. How do stale blocks occur?

When there are competing versions of the same transaction data.

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

It is accepted that six subsequent blocks be added to the blockchain. This can give confidence that the transaction is actually confirmed and will not be returned to the mempool.

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#4561
  1. What happens in the bitcoin network when two miners solve a block at the same time?

Each broadcast their version of the blockchain, till new blocks are mined, them the longest version prevails as the truth and the other block is dropped and their transactions come back to the mempool

  1. What is a stale block?
    It is a block that was in the blockchain but it got dropped
  2. How do stale blocks occur?
    explained in point 1
  3. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

each block that comes after the block it rise the probability to be in the chain that prevails. the advise is to wait for 6 confirmations, 1 hour, what it is a big issue for scalability

#4562
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    two valid blocks are created and broadcast through the network.
  2. What is a stale block? a valid block that is added to the blockchain but gets dropped, with all its transactions returned to the mempool because it a different version of the blockchain with a higher PoW is adopted and propagated through the network
  3. How do stale blocks occur? when two different miners solve the hash puzzle at the same time, and added their respective blocks to the blockchain, but one version losses out because the other is used to propagate the next block and therefore increases PoW of that version of the blockchain, which makes the other version to be invalidated
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    because not only is validity necessary, but confirmation, that there aren’t other blocks that have been validated at the same time and that the block your transaction(s) are on is not a stale block
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#4563
  1. There will be two true versions of the blockchain, but only one will be added to the network - with the longest blockchain (not based on a number of blocks, but POW), and the other will be added to mempol.
  2. These are blocks that were in the blockchain but were dropped.
  3. By dropping them from the blockchain.
  4. To be sure the transaction is confirmed and the block with the transaction will not be added to the permanent blocks, it is best to wait for 6 more blocks to be confirmed to be sure.
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#4564

  • What happens in the bitcoin network when two miners solve a block at the same time?
    then the next miner dictates which of the 2 blocks is accepted, because the blockchain always chooses the longer chain.

  • What is a stale block?
    the slate block is the remaining block that was confirmed, but not chosen by the next miner, and gets dropped. the transactions on that block go to the mempool.

  • How do stale blocks occur?
    if 2 or more blocks are confirmed at the same time, eventually one of the blocks will end up winning and when the nodes in the blockchain choose one, the dropped one is the stale or orphan block.

  • Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    it is important to wait for at least 6 confirmations because your transaction may be put in a block that is then dropped after some blocks if more recent miners choose a longer chain. in 10 minutes everything should be synced.

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#4565
  1. When two miners solve a block at the time time on the Bitcoin network the chain forks until other blocks create a longer chain on either block and that one wins. The other block is considered a stale or orphaned block and is discarded and all transactions are returned to the mempool.
  2. A stale block is a block that is on forked chain but was discarded because the other block that was produced at the same became part of the longest chain and was accepted by the network.
  3. Stale blocks occur when two blocks are produced at the same time with valid versions of truth but gets dropped in favor of the block with the longest chain.
  4. It is important to wait for at least six confirmations to make sure you are not on a stale block chain that is going to be dropped.
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#4566

  1. When 2 miners solve a block at the same time both of them are accepted by the network until a new block is appended to one of them. Once that happens the network drops the shorter chain of blocks.

  2. A stale block is a block that is removed from the blockchain because it was mined around the same time as another block and was part of the blockchain with the shorter history.

3.Stale blocks occur when miners mine 2 blocks at around the same time but then drops the one with the shorter history.

  1. Its important to wait multiple blocks before confirming a transaction to ensure that your transaction isnt on a stale block.
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#4567
  1. The network instantly tries to find the largest blockchain so there is only 1 version of the data
    and the other block even being legit is dropped and transactions init are reverted.
  2. A stale block is the block that is deprecated in the process.
  3. When two miners mine a block at the same time
  4. Because our transaction can be dropped in the process due to a stale block.
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#4568
  1. What happens in the bitcoin network when two miners solve a block at the same time?
  2. What is a stale block?
    stale block is one that is mined but not put on the chain when two get mined at the same time but loses out to the other one.
  3. How do stale blocks occur?
    when two blocks are mined at the same time and the stale block looses out to the other one that becomes longer.
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    to make sure you are not on a stale block
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#4569
  1. When 2 miners solve a block at the same time the block in the longest chain wins and the other block is discarded and considered a stale or orphaned block. All the transactions are returned to the mempool.
  2. A stale block is the block that was in the blockchain but then dropped because another block that was produced at the same time was part of a longer chain.
  3. Stale blocks occur when a block was valid for a while because 2 were produced with the same version of the truth but then dropped because the blockchain continued on another block.
  4. It is important to wait for 6 confirmations to be sure that the block your transactions are in is not dropped from the chain.
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#4570

  1. The chain splits and starts going to ways, this will happen until 1 chain is longer than the other. then the smaller chain will be dropped and the TXs will be sent back to mempool.

  2. a stale block is a confirmed block that is rejected by the network.

  3. you should wait 6 blocks incase your TXs is in a block that becomes stale. this gives enough time for the longest chain to be decided and sent to the network

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#4571
  1. What happens in the bitcoin network when two miners solve a block at the same time?

The chain ends up having different blocks temporarily until the longest chain wins.

  1. What is a stale block?

Its when a block is dropped from the blockchain.

  1. How do stale blocks occur?

A stale block is when there is two versions of the truth temporarily and longest chain wins. The stale block that wasn’t part of that chain that’s longer is then dropped or orphaned.

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

Because the transaction may be in a block that will become stale and orphaned. So its important to have enough confirmations 6 or more before the transactions fully confirmed.

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#4572

  1. When two miners solve a block at the same time, two rival versions of the blockchain result. The next block generated will attach to one version of blockchain truth, and the other version will fall away disregarded.
    All transactions on the block dropped which have not been included in the transaction list on the block accepted, will be returned to the mempool.

  2. A stale block is a block which, although it had been confirmed, did not survive after six blockchain confirmations throughout the global network.

  3. Stale blocks suffer their fate by not being part of the larger chain which also has proof of more work within it.

  4. It is important to wait for more than one block to be confirmed for the global network to be properly synced. If one does not do so, he risks the possibility of his transaction be dropped and his next transaction not making sense to the nodes.
    These nodes would see/determine that there are insufficient UTXOs in the network, invalidating the next transaction in spite of what balance the wallet may state.
    Confusion, frustration, anger, smashed chinaware, damaged furniture and hurt feelings may follow.
    So… for large sums, especially, best to wait for six (6) confirmations. :wink:

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#4573

When two miners solve a block at the same time, both their blocks will be added to the network, but only the one that gets picked up the fastest by the next miner that completes a block will remain in the chain.
The other block is called a stale or orphaned block and it gets dropped out by the network (the network picks up the longest chain, the one with more PoW).

  1. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    To be sure the transaction is not part of a stale block. For a transaction to be 100% confirmed, is best to wait 6 blocks confirmations.
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#4574

  1. Depending on the locality of the nearest nodes for each miner, two different versions of the blockchain will propagate throughout the network; creating competition between the two versions as miners begin to work on the respective versions they get.

  2. Stale blocks are blocks that were once part of the blockchain but were dropped from the chain in favor of a longer blockchain with different but equally valid blocks. The transactions within that specific block get returned to the mempool.

  3. Stale blocks are a result of the competition that occurs whenever two versions of the blockchain get validated at the same time. Only the blockchain with the most PoW will get accepted by the network. Thus, whoever computes the next block for the specific chain they received will cause the network to drop the other block that was solved, turning it into a stale block.

  4. It’s important to wait for at least 6 confirmations, that is 6 more succeeding blocks that are validated for the blockchain, because there is a chance that the block containing a particular transaction will turn into a stale block and the transaction will need to be revalidated again.

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