Homework on Stale Blocks

Blockchain and Bitcoin 101
#722
  1. both blocks are appended to the blockchain and propagated to other nodes. so temporarily we do have 2 truths on the network. the next block appended by a miner to the blockchain helps solving the problem: this chain of blocks is now longer and will be continued. the other one not, meaning the block will not be in the new blockchain and included tx will go back to the mempool
  2. they were added to the blockchain at the same time with at least on other block from another miner. we do have now two block-chains with 2 truths. when the next block will be added to one of these chains: its truth time. only this chain will be continued, the other one abandoned - meaning the block incl. included transactions will be removed from the chain - although they were valid on some nodes on the block chain for some time
    4)the remaining risk, that my tx’s are in a block that might have to be abandoned from the chain are lower, with every confirmation of a new created block on receives. waiting for 6 confirmations is best practice.
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#723
  1. What happens in the bitcoin network when two miners solve a block at the same time?

Means the both block primarily will be part of the network but once another block will be linked to one of those two blocks then that block will be completely accepted because will be the longest and the other block will be dropped and sent to mempool.
2. What is a stale block?

A stale block is a block which was dropped from the network to the mempool
3. How do stale blocks occur?

They occur when two miners are solving the crypto puzzle in the same time and eventualy only one of them will be accepted by the network.
4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

Is really important because the network needs time before the next block might me created as some blocks can be dropped as it happened in the situation of two miners added in the same time a block to the network.

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#724

  1. both blocks are temporarily added to the network. 2 versions of “truth”.

  2. a stale block is a block that gets removed from the network as not enough confirmations and the txs return to the mempool.

  3. When 2 miners create a block at the same time and both blocks are temporarily added to the network. 2 versions of “truth” until either block gets joined by new blocks, which ever line of blocks contains higher POW will become the 1 official version and the other block will become orphaned/stale and txs will return to the mempool.

  4. It is important to wait for more than 1 block to be confirmed. 6 confirmations are needed for the block to be appended and confirmed on the network. This reduces the risk of stale blocks.
    Minimise stale blocks, 6 confirmed blocks means higher pow which means your chain will be the 1 version of truth.

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#725

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    They will be added to the chain but only one will be accepted. The longer chain wins.

  2. What is a stale block?
    Its A orphan block.This is the block what has been added temporarily to the chain and shortly after send (removed)to the Mempool

  3. How do stale blocks occur?
    When 2 blocks are produced at the time and add to the chain.The short one is removed -the Staleblock

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    the time is needed for confirmation.We need 6 blocks after the new produced ones

#726

Yes, there are 2 versions of truth for a while, it all depends on wich version the next miner mines a new block on top of it. (wich makes it a bigger chain)

#727
  1. when 2 miners solve a block at the same time it is possible that both will be picked up by different nodes and blocks will be added to these 2 different chains leading to 2 different versions of the Blockchain.
  2. Eventually the chain with a higher overall POW will survive, while the other chain is dropped leading to "Orphaned/Stale’’ blocks this will lead to transactions being dropped as well.
  3. See above
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#728
  1. The network will temporarily have two sources of truth.
  2. A block that was, at one time, accepted into the blockchain, but since has been dropped.
  3. A stale block occurs when there are multiple sources of truth in the network, and one of those is built upon creating a longer chain. The chain with the longer (most) POW will be accepted by the network as a hole, while the block(s) on the “shorter” chain are considered “stale”, dropped from the chain, and Tx returned to the mempool.
  4. To ensure against stale blocks.
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#729

1.What happens in the bitcoin network when two miners solve a block at the same time?
Block chain is forked temporarily.
2.What is a stale block?
Stale blocks occur when there are competing blockchains (temporary fork) due to multiple miners that solved different blocks at the same time. Once a block is not part of the longest chain, it becomes “stale” and is discarded. Transactions in a discarded (stale) block are returned to the mempool for processing.
3.How do stale blocks occur?
Multiple miners that solved different blocks 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?
To make sure your transaction is not in a stale block.

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#730
  1. What happens in the bitcoin network when two miners solve a block at the same time? The blockchain will split. The longest chain with the most difficulty wins. The orphaned TX’s from the losing chain return to the mempool.
  2. What is a stale block? A valid block from a dropped short chain. TX’s returned to mempool.
  3. How do stale blocks occur? Stale blocks are blocks from the shorter chain that are dropped.
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction? Your block might become part of a stale block and need to be rehashed.
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#731
  1. What happens in the bitcoin network when two miners solve a block at the same time?

The blockchain will split in two temporarily until one chain is longer than the other.

  1. What is a stale block?

A block that has been stamped as dropped or invalid due to being the shortest link in a temporarily split chain, caused by two miners solving a block at the same time.

  1. How do stale blocks occur?

A stale block occurs after a temporarily forked chain continues on between two blocks. The shorter chain with the now stale block will discontinue and the transactions will be returned into the mempool.

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

This helps to insure that the transaction can take place and not dropped due to stale blocks

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#732

1. What happens in the bitcoin network when two miners solve a block at the same time?
It’s kind of like male tryouts for a porno movie (not that I would know by experience…), the longest chain wins. So, it depends on which block the next miners append their block to the quickest. The longer chain of blocks wins and the transactions of the loser block are returned to the Mempool. (The only thing I’m not sure about is the level of difficulty. Sounds like the blocks appended with a higher level of difficulty could defeat a larger number of more simple blocks). Either way, there can be only one version of truth.

2. What is a stale block?
A stale or “orphaned” block is a block that was defeated by another block created at the same time (as described in answer #1 above). It’s transactions are returned to the Mempool.

3. How do stale blocks occur?
When 2 blocks are solved by miners simultaneously one will continue to propagate through the network to be confirmed whilst the other will be rejected. It’s kind of like the Highlander, “there can be only one.”

4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
Apparently the number 6 is the golden rule for confirmations. One should wait for 6 confirmations before celebrating. Up until that time everything could be looking rosy then suddenly, “poof” your block is dropped and back to the Mempool you go.

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#733
  1. If both blocks are legit, some of the network receive one block and some of the network another block. Then it depends who in the network mines next block.
  2. A block that is not part of the blockchain anymore.
  3. When two miners mine a new block, both blocks are added to the blockchain. So whoever mines the next block confirms which of the previous 2 block is now part of the blockchain. The one that is not is called stale block.
  4. It could happen that more blocks in a row are mine simultaneusly.
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#734

1- when 2 blocks are mined at the same time, 2 true versions of the blockchain exist for a brief period until the next block is mined. The miner of the latest block will then hash it to whichever block is previous to theirs according to their node.
2- a stale block is the block that is not chosen to be part of the true blockchain after the latest block is mined
3- this will help verify that the transaction was part of a block that wasn’t dropped by the network on the off chance it was in an orphaned/stale block

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#735

  1. There will be a 2 valid versions of the truth from which one soon become longest with most pow and than accepted by the network.

  2. Stale block is a dropped block - shorter version of the truth not accepted by the network.

  3. When the 2 miners get the nonce at same time.

  4. To be sure the block we chosen to work will not be dropped.

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#736

  1. When two miners compete and solve the same block. the block with the longest chain wins victory to be on the network. The other block is disregarded and drops out the chain completely. which is called a stale block.

  2. A stale block is a weak link. lol… it just means that it wasn’t the longest & gets dropped from the network.

  3. A stale block occurs when miners are mining but another mine comes in the game and doesn’t join the opposing miners link. therefore giving the advantage to another block link to be on the BTC blockchain network.

  4. Waiting for more than one confirmation is important because it lets us know when more confirmations means more miners are linked with my transactions and it has a higher probability of getting on the BTC blockchain network.

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#737
  1. What happens in the bitcoin network when two miners solve a block at the same time?

Each miners block will begin propogating throughout the nodes on the network closest to them. Whichever blockchain is selected for the following block will remain as the true blockchain and the other one will be dropped. Transactions from dropped blocks return to the memepool.

  1. What is a stale block?

Stale blocks or “orphaned” blocks are valid blocks that were dropped out of the shorter competing chains.

  1. How do stale blocks occur?

The network will accept the longest (also most difficult) blockchain as the true chain. In the event of seperate miners simultaneously adding blocks, only one chain will win out as the longest. The other valid blocks will then be dropped and their transactions returned to the memepool. These are refered to as “stale” blocks.

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

Stale blocks are frequent. Blocks and their corresponding transactions become more secure as more blocks are adding after them. Six blocks ahead is a generaly considered secure.

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#738
  1. What happens in the bitcoin network when two miners solve a block at the same time?
  • Nodes will have different blocks.
  1. What is a stale block?
  • A stale block is the block that is not connected to the next block from a miner. All transaction of a stale block will be send back to the mempool.
  1. How do stale blocks occur?
  • A stale block occurs when miners find 2 blocks at the same time. The block that is not connected to the next block will become a stale block, therefore unconfirmed.
  1. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
  • Only the chain with the most PoW will be the truth.If your block only has one confirmation, chances are that block, with your transaction, could still become a stale block. Typical we wait for 6 confirmations to be sure a block/transaction is confirmed, thus meaning it is part of the truth/network.
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#739
  1. Some nodes/miners will accept block a, some block b. The next blocks will determine which chain (a or b) will be the truth.

2 + 3. If a miner accepts block a and start mining again and finds a new block, this will be the longest chain with most PoW and block b will be dropped. Block b is a stale block.

  1. The longest chain wins. So if your transaction is in a stale block it will get dropped. The more confirmations the longer the chain and this means higher chance that your transaction will not get dropped.
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#740

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

  • both of those block start propagating through the nodes in the network and eventually the block with the longest chain get adopted and the other one is discard

2. What is a stale block?

  • a block that has been discarded from the blockchain as it got replaced from another block

3. How do stale blocks occur?

  • a stale block occurs when some other block with bigger adoption from the blockchain takes its position.

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

  • because that block might end up being a stale block and the transaction that was on it would not be valid by the network.
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#741
  • What happens in the bitcoin network when two miners solve a block at the same time?

2 versions of the block chain continue the next miner will choose one of these blocks and continue mining and the other block is dropped

  • What is a stale block?

A block that has been dropped and added back to the mempool**

  • How do stale blocks occur?

When 2 blocks are mined at the same time 2 versions of the block chain continue until another miner continues the block chain from one of these blocks and the block that was not continued from is dropped and added back to the mempool

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

To ensure that your block has become part of the true block chain and is not dropped and added back to the mempool**

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