Homework on Stale Blocks

Blockchain and Bitcoin 101
#4274
  1. Miner will the longer chain will win.
  2. Stale block is the block that was dropped and returned back to the mempool.
  3. When two miners are producing blocks at the same time.
  4. It’s important to wait until 6 confirmations to insure that the block isn’t a stale block and returns to mempool
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#4275
  1. Both are valid until the following block is mined. Always the longest blockchain is valid.
  2. stale block used to be in the blockchain and was canceled due to another block that was mined at the same time and the chain was carried on on this block.
    3.see answer 2.
  3. because the transaction could get canceled when it is a stale block. After 6 confirmation you can be sure your block was not dropped.
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#4276

  1. Both of the Blocks, which are both valid get picked up by the Blockchain and the Blockchain splits. But only getting picked up by the chain doesn’t validate the transactions in the blocks. We wait for 6 other blocks to be confirmed after yours to be sure that your Block is valid.

  2. Stale Blocks are blocks which did get picked up by the Blockchain but got dropped.

  3. How do blocks get dropped? Imagine that the Blockchain splits because 2 or more miners have come up with a valid block at the same time. The closer the miners and nodes are to each one of those newly generated bocks, the higher is the probability to pick up this end of the chain and build upon it. If one of those ends becomes the first one to have another block after it, it “winns” and gets confirmed. The other ends of the Blockchain become invalid and get dropped. All of those transactions in the Blocks get put back in the mempool, and they wait to be mined again.

  4. Now as I established if this happens, your completely valid block gets dropped and you have to wait for it to be mined again. This is why you have to wait for at least 6 Blocks to be confirmed after yours to be certain that your block is validated and your transactions came through.

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#4277

  1. When two miners solve a block at the same time, you get two chains competing for approval, where eventually one will outwork the other and be accepted as the true blockchain.

  2. A stale block is a block that has been rejected over another block with more PoW. Once that happens, the transactions of the stale block get dropped back in the mempool.

  3. Stale blocks occur when two blocks are accepted at the same time. Eventually, one block is approved and the other becomes the stale block.

  4. It is important to wait for more than one block to be confirmed so that the probability of your transaction being in a stale block becomes extremely low.

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#4278
  1. The longer block will prevail and the other blocks will be orphaned.
    2)A stale block is a block that has been dropped.
  2. Stale blocks occur when 2 miners have solved 2 blocks but he one with the shorter blockchain gets dropped.
    4)its good to wait for atleast 6 blocks to ensure that the block was approved by the nodes and didnot become stale or orphaned.
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#4279

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    Different nodes will accept different blocks, usually based on physical proximity. This means there will be multiple versions on the blockchain until new blocks are added, at which time the shorter version (less PoW) of the chain will be invalidated.

  2. What is a stale block?
    A block which is part of a shorter chain. Sooner or later, this block will be rejected in favor of the longer chain (more PoW) and the data within the stale block will be returned to the mempool.

  3. How do stale blocks occur?
    When the blockchain is resolved with different new blocks and becomes longer than the chain containing the stale block.

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    Because the new block could prove to be a stale block in the future. It’s important to wait for new blocks to be added to be sure the block will actually become part of the longest chain.

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#4280

  1. There are two versions of the blockchain until another miner chooses one of the versions. The transactions from the stale/orphaned block on other version of the blockchain are put back into the mempool to be validated again.

  2. A stale block is a block that is no longer a part of the current blockchain.

  3. A stale block occurs when there are two versions of the blockchain after two blocks have been solved at the same time. When the next miner chooses one of the versions of the block chain (the longer one/one with more PoW), the other version of the blockchain with the other solved block is dropped. The block that is not part of the current blockchain is the stale block.

  4. It is important to wait for more than one confirmation because a stale block could occur and your transaction may need to be re-validated. The more confirmations you have, the less likely this is to happen.

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#4281
  1. Both blocks wil be added to blockchain. The blockchain splits and then after a new block is added the longer chain wins.
  2. A stale block is ablock that was previous in the chain (at the same time mined with another block) and the miners choose the other block to continue. A stale block gets removed from the chain and all the transactions return to the mempool.
  3. When there is a competition between 2 blocks. The miners decide which block wins. The stale block is rejected.
  4. To be sure that this block is really accepted and that is not a stale block
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#4282
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    The chain will fork temporarily
  2. What is a stale block?
    A block that gets put back into mempool in favor of chain with more POW
  3. How do stale blocks occur?
    Stale blocks occur after a fork is resolved with a longer chain
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    In case of a stale block occurring.
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#4283

  1. the chain splits into 2 temporarily. Both were valid, but when another block is entered and chooses which block it wants to join with, the other will be removed

  2. completely valid blocks that were once in the blockchain and later on were dropped

  3. stale blocks occur when 2 miners mine a valid block each at the same time, and then if one extends, the other becomes a stale/orphaned block.

  4. to minimize the issue with stale blocks

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#4284

Both versions of the truth will be broadcast until a miner adds a new block onto one of those previous blocks causing a longer version of the chain.

A block that was mined into the chain but later gets dropped and sent back to the mempool.

When versions of the blockchain are being broadcast containing a different block order, the version of the chain that becomes longer will be kept, causing any blocks not validated in the accepted version to become a stale block and be returned to the mempool.

Just incase your transaction is part of a block that becomes a stale block and is invalidated.

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#4285
  1. Both blocks will be accepted into the network, but due to the length of the blockchain, eventually one of the blocks will be dropped off.
  2. A block that is dropped off.
  3. When the blocks are dropped off due to the length of the blockchain.
  4. Because, by waiting, there will be a certainty that a confirmed transaction was not in a stale block.
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#4286
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    miners near the respective blocks will get same solutions. There will be a network consensus and longest chain wins.
  2. What is a stale block?
    Discarded block not in the longest chain
  3. How do stale blocks occur?
    When the network consensus prefer a solution and stale blocks are discarded
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    Reduce the chance of being dropped and returned back to mempool
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#4287

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    *There will be basically a split of the chain

  2. What is a stale block?
    *Blocks that are once in a blockchain but was dropped because it was overtaken by another block to build the longest chain.

  3. How do stale blocks occur?
    *It occurs when the miners append a block into the blockchain faster than the propagation of the data into the nodes.

  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 blocks are not dropped and minimize the so called stale blocks

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#4288
  1. One of the miner will win, the one with the longest blockchain wins. The smaller blockchain will be orphaned.
  2. Stale block is a block that gets put back into the mempool for a chain with more Proof Of Work.
  3. Stale blocks are created after a fork is resolved, the stale block is the shorter blockchain while the longer one wins.
  4. 6 confirmations are to be used to make sure that the blocks in the chain has the right transactions, we don’t want too many versions of the truth, the more confirmations there are, the longer the blockchain is.
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#4289

1 - 4
If two miners solve a block at exactly the same time, for a small period of time, there will be two truths living simultaneously on the network. Node 1, 2 and 3 have version A, and node 4, 5 and 6 have a (probably) different version B, depending who got which first. When one of those miners (or an other miner), calculates the next block with their version of the truth (A) the fastest miner will win that 3rd block. Because of PoW, that blockchain is now valid and longer than de other and so all nodes will have block 3 as their (new) truth (A). The block with truth B, called a stale block, will no longer be valid and will give all its transactions back in to the mempool. So to be sure that your transaction is validated and confirmed, you need to make sure it did not end up in a stale block and need to wait for more (preferably 6) validations.

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#4290
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    • 2 competing blockchains propagate the network
    • The first blockchain to be extended is confirmed and the competing blockchain ultimately rejected by the nodes, with the associated transaction added back to mempool
  2. What is a stale block?
    • The leading block of a rejected blockchain is referred to as a stale block
  3. How do stale blocks occur?
    • When 2 miners solve a block at the same time 2 competing blockchains propagate the network
    • The 1st competing blockchain to have an addition block appended to its blockchain wins with the other being rejected
    • The leading block of the rejected blockchain is referred as a stake block
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    • To ensure the network has had enough time to come to consensus and the transaction in question is not a victim of a stale block
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#4291
  1. Both blocks can be propagated around the network, however one will be disregarded depending on which the next block is mined from.
  2. A block that is confirmed then dropped as chain continue on a competing block
  3. Stale blocks occur from block different blocks being mined simultaneously, one continues with a new block and one is dropped.
  4. To ensure that your transaction hasn’t been confirmed as part of a stale block, which would result in it going back to the mempool (being unconfirmed).
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#4292

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    Ans : In that scenario, upcoming miner or another miner to create that same block, which block that new miner chosen will execute that miner. Another miner will reject. In a single word - Long network will choose in the blockchain.

  2. What is a stale block?
    Ans : The valid block created once and get rejected its called stale block. When the two miner solve a block in same time, in that scenario the rejected block consider as stale block. It goes again to mempool.

  3. How do stale blocks occur?
    Ans : It occur, When the two miner solve a block in same time, When another miner to create that same block, which block that new miner chosen will select that miner and execute the block. In that scenario the rejected block consider as stale block

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    Ans : The 1st block is the basement for that whole transaction. The 1st block is called as genesis block. This 1st block is get difficult to solve mathematical puzzle. once the block created successfully and we can confirm that transaction has been confirmed.

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#4293

  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 is up to the miner after them to choose between the two to continue the chain. Once that happens, the block(s) that was/were not chosen will be dropped.

  2. What is a stale block?
    A stale block are blocks that were part of the blockchain before they were dropped and put back into the mempool for a more favorable chain by miners.

  3. How do stale blocks occur?
    Stale blocks occur when two miners mine a valid block at the same time. A block within a chain is dropped as the blockchain continued onto another chain separate from those stale blocks.

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    To alleviate the problems that would be caused by stale blocks, waiting is preferable so as to know which chain has been accepted by the network. The more confirmations there are, the longer the length of the blockchain. Waiting to see where miners go next is the best route instead of wasting valuable resources on stale blocks/chain.

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