Homework on Stale Blocks

Blockchain and Bitcoin 101
#4595

  1. there will be multiple versions of blockchain among the nodes, and finally the chain with longest size will be retained

  2. the block to be dropped because there is another version of blockchain that has the same historical transactions but has longer size with new blocks

  3. there are different versions of blockchain among the network, but only the longest chain is to be retained

  4. if there are more confirmed blocks attached to the current blockchain, it is less possible for this blockchain to be dropped, where the related transactions within these slate blocks will be moved back to the mempool

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#4596
  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 occurrin
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#4597

1- Bitcoin network will choose the longest blocks to continue in the blockchain, it depends on the new block that come after after these two minerā€™s blocks.

2- Stale block is the block that was in the blockchain but then dropped because another block that was produced at the same time it was part of a longer blocks.

3- when the miners mine a block at the same time.

4- To be sure that our transaction not in a stale block.

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#4598

1.then two versions of the blockchain exist till one gets dropped , the longest blockchain survives and the shortest one gets dropped.
2.the blocks that gets dropped or cancelled
3.the block gets dropped because their is a longer version of the blockchain , so everyone agrees to use that one and drop the short one, the transactions go baack into the mempool to get mined in to a new block.
4.If you dont wait, there is a chance that the block gets dropped because of two versions of the blockchain, your transaction might then be in a tale block.

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#4599

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    the longest chain wins and the other block is disgarded, transactions return to mempool.

  2. What is a stale block?
    Blocks that were mined, but end up getting dropped from being in the blockchain because multiple blocks were created at the time time

  3. How do stale blocks occur?
    when blocks are produced too quickly and multiple blocks are created 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 minimize stale blocks being produced, minimize droppage,

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#4600

1.) When two miners solve a block at the same time, the nodes nearest to the miner will analyze which of the two minersā€™ blockchains has the highest difficulty/most proof of work; the miner who has the block with the least proof of work has it rejected and sent back to the mempool.
2.) A stale block is a block formerly rejected by the blockchchain due to an inferior chain of blocks.
3.) Stale blocks occur when two miners blocks are solved at the same time, and the block with the least proof of work/low difficulty gets rejected by the network.
4.) Itā€™s important to wait for more than one block to be confirmed when sending or receiving a transaction so that oneā€™s block can be completely confirmed, and not dropped by the network nodes. More confirmations make for less chance of the block being turned to a stale block.

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#4601
  • What happens in the bitcoin network when two miners solve a block at the same time?
    Than the block with the most blocks (so the longest chain of blocks) attached (POW) is getting selected.
  • What is a stale block?
    The block that was in the blockchain but got dropped because there were no other blocks attached to them.
  • How do stale blocks occur?
    State blocks occur during mining process but at the end got rejected over another block that had other block attached.
  • Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction? TO create the chain of the blocks to be attached to each other in order not to become the orphane block,
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#4602

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

When 2 miners solve a valid block at the same, they each start propagating their blocks through the network. Since both blocks are valid by the assessment of the full nodes.

The correct chain will be the longest chain, or in other words the chain with the most proof of work. The next miner who solves a block will either be on Truth A or B, appending a block to either A or B. The other nodes will then drop the previous block. And update their ledger to the longest chain.

2. What is a stale block?

A stale block is : A block that was deemed valid, but was later dropped due to a accidental chain split.

3. How do stale blocks occur?

Stale blocks occur, for example when 2 miners solve a block at the same time. Until the next block is found, and all other nodes have updates back to the longest chain. There will be a ā€œfork in the roadā€ a split of the chain. When the chain converges into one again, the invalid chain of blocks are dropped. Such blocks then become ā€œstaleā€ or ā€œorphanedā€ blocks.

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

Since there is always a chance that your specific transaction ended up in a so called ā€œstale blockā€ it is advised to wait for 6 block confirmations to be sure your transaction will not be dropped.

This is also why in most cases you can see your balance on an exchange a few minutes after you have send the funds. But it only becomes available to you after xx block confirmations.

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#4603
  1. They propagate those blocks to the nodes closest to them, those nodes accept their block and other miners accept it until another block is mined on one of them. The longest chain is always accepted by nodes and therefore whichever one becomes part of the longest chain is the accepted one and the other is dropped and all transactions invalidated and returned to the mempool - this is the stale block
  2. A block that is valid but is dropped from the blockchain because it does not form part of the longest blockchain
  3. If two miners add a block at around the same time (or before the other block has propagated through the network) and miners build the next block(s) on those blocks then the block that has the shortest chain will be dropped (nodes will accept the longest chain) and once that has propagated through to all nodes the block becomes stale
  4. Because the block that your transaction forms part of could become stale and the transaction would be invalidated, it is better to make sure that there are enough blocks added that the chances of this happening are extremely unlikely if not impossible
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#4604
  1. They both have a valid blockchain but it depends which one will be propagated faster and afterwards a new block added faster to that block. If someone else wins, then the block will be dropped.
  2. The valid block that lost against another block and was dropped from the blockchain.
  3. The stale blocks occur if they are mined faster than in 10 minutes and not propagated entirely on the network.
  4. To make sure that the block will be accepted and additional 6 blocks added to make the longest chain.
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#4605
  1. When two miners solve a block at the same time, the chain will split into two. The longest out of the two will win while the other chainā€™s transactions will be put into the mempool.
  2. A stale block is a valid block that existed within the blockchain before it had to be dropped for another block.
  3. A stale block occurs when two miners create a valid block at similar times. It belongs to the shortest chain.
  4. It is important to wait for more than one block to be confirmed to prevent your own transactions from being within the losing chain.
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#4606

  1. One block is dropped, the one with the most proof of work is chosen and the txā€™s from the dropped block return to the mempool.

  2. A stale block, or orphaned block is, a block that is disregarded in favor of one with the single version of truth

  3. Stale blocks occur when two blocks solve the cryptographic puzzle at the same time. One block is followed faster than the other, resulting in the unfollowed block being dropped and returned to the mempool.

  4. In order to insure that the tx is not dropped in a stale block

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#4607
  1. whichever blockchain becomes longer is then the accepted version and all other transactions are booted to the mempool.
    2/3. a stale block is the result of a longer chain being propagated therefore no longer accepted as legitimate.
    4.The wait time is important to make sure your transactions were verified and do not become stale or orphaned.
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#4608
  • What happens in the bitcoin network when two miners solve a block at the same time?
    They competing with each other and the longer blockchain will win.
  • What is a stale block?
    It is a block that is dropped or removed from the network, completely valid block.
  • How do stale blocks occur?
    It is occur when 2 blocks are produce in the same time.
  • Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    6 confirmation are needed, it means 6 more blocks, so it is sure that block will be not dropped or orphaned.
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#4609
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    They both will exist for a period of time as a valid block- eventually one of the blocks will be mined upon resulting in a longer POW chain resulting in 2 blockchains of different lengths. Bu that is only part of the storyā€¦
  2. What is a stale block?
    It is the block that was written concurrently that doesnā€™t have the next block mined upon it. It will be considered invalid and itā€™s transactions returned to the mem pool
  3. How do stale blocks occur?
    When 2 blocks get appended to the block chain at the same time, and the next block is only written to one of them because the blocks hadnā€™t propagated the network fully yet.
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    This is the best way to know that you are avoided a stale block; the transaction has fully propogated the network
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#4610

  1. When two miners solved a cryptographic puzzle at the same time, both hash and nonce will be valid. There will two blocks formed from the previous block.

  2. Stale block or also called orphaned block are the those blocks that are being dropped by the blockchain.

  3. Stale blocks occur when thereā€™s a blockchain which is longer and with most PoW/Proof of work as the network accepts it rather than the shorter blocks.

  4. It is advised to wait for 6 block confirmations just to make sure that yours will not be dropped or be part of the stale blocks.

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#4611
  1. Both blocks will be created until the next block appears
  2. And orphaned block / not connected to any block
  3. When a longer blockchain is selected and a particular block is not part of it, and that block is discarded. That block is called stale block
  4. to decrease the number of stale blocks
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#4612

Hi everyone,

  1. The miners continue mining and a longer chain will be formed from one of the blocks, that is the one which will win as it is part of the longest chain. The transactions in the other block will get back to the mempool (I assume except the ones which happen to be also part of the winning block).
  2. A block which was dropped as solved at the same time of another block finally winning as part of a longer chain.
  3. Two blocks are solved at the same time, but one is winning as part of the longest chain, which let the other be dropped and become a stale block.
  4. Because a block can be solved and then be dropped, with the transactions back to the mempool. So for a transaction to be confirmed, you need first to be part of a block, and then wait to confirm that block is in the longest chain, chosen by the network.
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#4613

  1. When two miners solve a block at the same time there are 2 different versions of the blockchain for a temporary period of time. Some nodes may think one block is valid and the other nodes may think the other one is valid. Once one of the chains become longer then it is considered the truth and the other block is dropped.

  2. A stale block is a block that was once a part of the blockchain but was then dropped from the blockchain.

  3. Stale blocks occur when a block is dropped from the blockchain for another block.

  4. It is important to wait for more than one block to be confirmed because then you will know if that block was accepted by the network and was the truth. It is recommended to have 6 blocks after your block in order to fully confirm your block.

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#4614
  1. What happens in the bitcoin network when two miners solve a block at the same time?

Both blocks are valid en will be created in different versions of the blockchain. When the next blok is created, the one blockchain will be longer and the network chooses the longest version to be the truth.

  1. What is a stale block?

A block that is being dropped by the blockchain, despite the fact that it was a vallid block.

  1. How do stale blocks occur?

When two blocks are produced 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?

To make sure that the block, in which your transaction is added to the blockchain, wonā€™t be dropped from the blockchain (to become a stale block)

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