Homework on Stale Blocks

Blockchain and Bitcoin 101
#4575

  1. out of the two miners only one will win and that miner would have had the longest blockchain. The miner with the shortest will be dropped.

  2. a stale block is a miner with the shortest blockchain when two miners solve a block at the same time. these blocks are put back into the mempool

  3. stale blocks occurs when a blocked is forked by for example two miners. the miner with the longest blockchain wins that block

  4. best wait for 6 blocks to be confirmed in case of a stake block occuring

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#4576
  1. When 2 miners solve a block at the same time the network may begin propagating 2 blocks through the network. This can cause a split block chain where 2 blocks are added to the chain as separate truths. When a 3rd miner comes and tries to add another block to the chain, it will choose what it knows to be the truth and add to that block. The block that was left out is now the stale or orphaned block. A stale block happens because the 3rd miner who believes one part of the split chain is the correct block will add to that block. The other block is removed because it is a shorter chain and is sent back to the mempool. If the network has time to propogate a transaction before another is introduced, it will minimize the risk of creating stale blocks. It is important to have 6 or more transactions to fully confirm the chain.
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#4577

  1. When two miners solve a block at the same time, one of the blocks will win (the longest one) and the other will be returned to the mempool.

  2. A returned block to the mempool.

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#4578

1 - They create a split in the blockchain, the dominant chain is decided by a third miner to remain and the other gets dropped. Transactions go back to the mempool.

2 - A stale block is a block that no longer is used by miners.

3 - They happen by splits in the blockchain, the unpicked chain gets dropped.

4 - So the transaction doesn’t get dropped.

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#4579
  1. What happens in the bitcoin network when two miners solve a block at the same time?

It then depends on which block the next miner builds forward. That then becomes the longer chain, is adopted by the rest of the network and the other block competing for the same slot is discarded.

  1. What is a stale block?

A block with valid transactions that is rejected by the network because another block was propagated at the same time but managed to get another block mined on top of it, making that block longer and thus the leading chain.

  1. How do stale blocks occur?

A stale block occurs when a block was valid first but is then dropped bc the blockchain continued on another block.

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

So that the entire network has enough time to validate and make sure that everything is in order and that all the nodes in the network have consensus over which string of blocks is the correct one.

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#4580

Q1. What happens in the bitcoin network when two miners solve a block at the same time?
A. In the event that two blocks are simultaneously mined, one may be added to the blockchain in one location whereas the other may be accepted elsewhere. The next miner will determine which will remain on the blockchain and which will become ‘stale.’

Q2. What is a stale block?
A. A stale or ‘orphaned’ block has been legitimately mined but rejected by the network and its transactions returned to the mempool.

Q3. How do stale blocks occur?
A. Because of the physical aspect of a global network, it is possible for different versions of the blockchain to arise on nodes depending on their location. When two blocks are mined at the same time, their acceptance by the nodes will be according to the data that is locally received. This issue is resolved by the next miner determining which of the blocks will be included in the chain. The other block, which was still legitimately mined, will be returned to the mempool.

Q4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
A. It is recommended to wait until six blocks have been confirmed to be sure that the transaction wasn’t part of a stale block.

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#4581

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    When two blocks are mined at the same time it will depend on the next miner and what the next miner chooses to work on after the previous the previous block once the miner picks the previous block the network chooses the longer chain and the block that was not picked by that miner becomes a stale block.

  2. What is a stale block?
    A stale block is a block that was properly mined but the network ended up disregarding it because a miner did not selected its previous hash as a result of that the transactions go back to the mempool

  3. How do stale blocks occur?
    Stale blocks occur when a two miners guess the nonce and worked on the correct hash which is below the target and end up creating two different blocks with different transactions at similar intervals the next miner then decides which block to take on as the previous hash and mines another block due to the way he got information from the nearby nonces if that happens then the legitimate block that is not being selected transactions go back to the mempool because the longest chain is the dominating chain and all the other miners will agree on that.

  4. 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 6 block confirmations to ensure that the block is not part of a stale block.

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#4582

  1. Both confirmed blocks are propagated throughout the network. After 10 minutes, whoever’s block is linked with a newer block because the confirmed blockchain because now it is the longest. The other block’s transactions get sent back to the mempool.

  2. Stale blocks are blocks that failed to maintain confirmation on the longest blockchain. The transactions with those blocks are sent back to the mempool.

  3. Stale blocks occur when too many confirmed blockchain branches are being propagated through the network. When this occurs, the target decreases, increasing the difficulty of making a new, confirmed block. Once one is made and put on a blockchain branch, the other blockchain branches become stale and the transactions within those branches go back to the mempool.

  4. To make sure your transaction is on the longest blockchain. For if it isn’t, your transaction will take a longer time to get officially confirmed.

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#4583

1 - Takes the more long blocks solved
2 - Is a result of blocks mined but not taken like the principal solver :anguished:
3 - This occur when different nodes mine at the same time
4 - This may be is good for no enter in a stale block

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#4584
  1. What happens in the bitcoin network when two miners solve a block at the same time?

When two miners solve a block at the same time, it creates two different blockchains (temporary fork), this is because half of the network (nodes) thinks miner 1 is telling the truth, and the other half thinks miner 2 is telling the truth. Once these 2 blockchains are created, the first blockchain to get another TX attached onto their blockchain becomes a confirmed transaction and gives continuation to the network.

  1. What is a stale block?

A stale block is the block that is dropped once the network chooses the longest blockchain.

  1. How do stale blocks occur?

Stale blocks occur once 2 miners solve a block at the same time, and one of those blocks gets dropped by the network.

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

Because we´ll only know for certain that our block was appended to the blockchain once some other blocks are subsequently attached to ours.

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#4585

1. What happens in the bitcoin network when two miners solve a block at the same time?
They will both add it to their version of the blockchain and propagate that new version to the nodes.
Each node will go with the first new version it receives. So during a time, until the next update from a miner, we’ll have 2 different valid blockchains running. When a new miner submits his new blockchain, he’ll be the one choosing the version that survives. So if that new miner decided to build over version 1, version 2 will be dropped and the last block of version 2 will become a stale block.
Luckily, since the propagation time from a new blockchain a miner broadcast is very small in comparison to 10 minutes, it’s very unlikely that a second miner has time to valide his own block before getting the update. Therefore it might happen once or twice, but with time it becomes more and more unlikely.
2. What is a stale block?
It’s a block that was confirmed for some time, but got cancelled as its blockchain didn’t survive.
3. How do stale blocks occur?
It’s when 2 miners have time to validate a new block before getting updated about the new blockchain and therefore we have 2 valid blockchains running on the network. Then the next block will confirm which blockchain survive and the losing one sees all its different blocks turn stale.
4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
The more we wait the less likely the transaction will be in a stale block.

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#4586
  1. Then miners will continue a direction with thew most POW and the Txs in the other block will go back to mempool.
  2. A stale block is a block that gets let behind when two blocks are mined at the same time.
  3. Where two blocks get mined at the same time.
  4. To confirm the direction of the blo9ckchain.
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#4587
  1. What happens in the bitcoin network when two miners solve a block at the same time? They both get added to the blockchain and propagated BUT eventually, one of these blocks gets dropped while the other one stays, it all depends on what the next miner bases his block off of. Because the network will choose the chain with the most proof of work. All of the transactions in the dropped block get returned to the mempool.
  2. What is a stale block? Blocks in the blockchain that existed at one time but got dropped because there is another version of the blockchain that is longer/has more proof of work
  3. How do stale blocks occur? When more than one block is appended at the same time, creating a split in the chain. Miners will begin to solve for the next puzzle using one, or the other, end of the split chain. whichever of these chains becomes longest with the most PoW will be kept. The other will be a string of blocks known as Stale Blocks.
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction? Waiting for 6 confirmations is necessary because there is always a chance that your transaction is part of a chain that could be dropped.
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#4588
  1. If 2 miners solve the hash at the same time the miner with more network connections or proof of work will get accepted first. The other will be discarded and transactions put in the mempool.
  2. A stale block is a block that is successfully mined but not included on the current longest blockchain.
  3. Stale blocks usually occur because another block at the same height was added to the chain first.
  4. It is because the higher number of confirmations the less risk there is of a payment being reversed on the bitcoin network. A safe time to wait is 6 confirmations.
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#4589

1 A fork briefly and then the longest chain wins. The short one considered a stale or orphan block. All the transactions go back to the mempool.
2 The one that is dropped.
3 When two miners solve at the same time.
4 To avoid stale or orphaned bloocks.

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#4590
  1. There will be 2 versions of truth in the blockchain.
  2. A Stale block is a block that is no longer part of the current best blockchain because it is overridden by a longer chain.
  3. When 2 miners solve 2 blocks at the same time and all 2 blocks are accepted by the blockchain.
  4. Because there are risks that the transaction would not be in the current best blockchain (in a stale block for example) and then will be abandoned by the network.
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#4591
  1. The chain splits in two and the longest chain results a win. The other blocks drop off as stale blocks and other transaction goes to mempool.
  2. Stale block is a block which was successfully mined but not included on the current longest blockchain.
  3. They occur because another block at the same height was added to the chain first.
  4. It is important to wait for at least 6 confirmations to make sure the block does not become stale if there are multiples of the same block.
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#4592

  1. One of the blocks will win to be selected as the block chosen to be added to the blockchain since the chain is longer. While the other one will become a stale block and is sent back to the mempool.

  2. A stale block is a block that was in the blockchain but then dropped because there is a longer version of the block selected that doesn’t have the stale block in it.

  3. Stale blocks occur when two miners mine a block at the same time.

  4. To minimize the issue and occurrence of stale blocks.

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#4593

  1. When two miners form a block at the same time there are then two correct versions of the blockchain. These two versions of truth are spread out to the network by the nodes. The block that stays on the chain that ends up being the longest wins and the other is added back to the mempool.

  2. A stale block is a block dropped from the blockchain after being accepted. This is due to the block being on a shorter blockchain.

  3. Stale blocks soccer when two blocks are accepted at the same time and there are two versions of truth propagated through the network.

  4. It is important because your transaction could be included in a block that will become stale.

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#4594
  1. What happens in the bitcoin network when two miners solve a block at the same time?
  • You’ll get two versions of the blockchain and both versions are valid. Miners can continue mining on one of the two versions. The network will always choose the longest chain. The other block will be removed and put back in the mempool.
  1. What is a stale block?
  • When there are two versions of the blockchain (Block A and B), because miners solved the puzzle at exactly the same time. Both versions are valid. Some miners will continue mining on block A and others on block B. The network choose the longest chain and the others are being removed. This blocks are called “stale blocks”.
  1. How do stale blocks occur?
  • When some miners mine a block at the same time.
  1. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
  • Because your transaction can be in a block that could be dropped.
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