Homework on Stale Blocks

Blockchain and Bitcoin 101
#2990

  1. What happens in the bitcoin network when two miners solve a block at the same time?
    When the third miner creates new block it will go one of those 2 blocks and the one that not chosen it will drop from block chain and it will go back to mempool.

  2. What is a stale block?
    Stale block is when the blocks created faster than 10 min. we might have 2 valid blocks the same time and in the future one of them will be dropped.

  3. How do stale blocks occur?
    Stale block is created when the blocks created faster than 10 min. we might have 2 valid blocks the same time and in the future one of them will be dropped.

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

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#2991

  1. Whichever block gets added to that makes it a longer chain than the other will stay in the blockchain and the other will be dropped as a stale block and the transactions added back to the mempool.

  2. Block that was dropped because of a shorter chain. The transactions will go back into the mempool.

  3. When 2 blocks are mined at the same time, one will be added to the blockchain and the other will be dropped as a stale block.

  4. This ensures that your transaction wasnā€™t in a stale block and will need to go back to the mempool to be re-mined.

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#2992
  1. Both blocks are added to the chain and create a perception of two truths. Yet, the longest chain will win and the unused block will be come stale.
  2. A stale block its a valid block that is dropped from the block chain because another block was able to become part of the longer chain.
  3. Even though it was mined at the same time as another block, the stale block is what is rejected by the network because other block was accepted.
  4. It is important to have six confirmations to ensure it isnā€™t stale.
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#2993

  1. When two miners solve a block at the same time, both of the minersā€™ blocks are added to the blockchain and the closest nodes to each minerā€™s block will get his block. This will remain like this until another miner chooses (or if he is closer to one of them, he will directly pick that one) which block to use to mine his block.

  2. After the new miner appended his block to the blockchain, the blockchain with less blocks will be dropped from the chain and the transactions on that block will be moved back to the mempool. The block that is dropped from the chain is called stale block.

  3. Stale blocks occur when two miners from other parts of the world solve a puzzle at the same time. Due to the distance in between them, the nodes closer to each miner will accept will accept his block.

  4. Because although our transaction is added to a block, that block could be dropped and our transaction could be moved back to the mempool. In order to make sure that the block is valid, we wait for more than one blok to be confirmed.

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#2994
  1. What happens in the bitcoin network when two miners solve a block at the same time?
    Both block start to propage through the network until a next miner or block choose either of the 2 block previously created at the same time
  2. What is a stale block?
    Stale block is a block which are transaction are send back to the menpool, because the block was created simultaneously with another block
  3. How do stale blocks occur?
    When a new block is attached to the blockchain, an another block that was created at the same time is not chosen, making the longer chain the winner chain
  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
    In case there is a stale block or a block is dropped because the transaction has not been completly or correctly confirmed
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#2995

  1. The Block will fork into different blocks and then the eventually another block will be added and the blockchain will continue with the longest block becoming the true block.

  2. A block that was removed from the chain in favor of the block with the most proof of work.

  3. They occur when when multiple blocks or formed in a short time period. usually within 10min.

  4. Its important so that the transaction has enough time to get validated and put onto the Blockchain.

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#2996
  1. The network will split, and the network with more proof of work will take over then the other block will be removed. winners and losers.
  2. A stale block is just a block(s) removed from the chain because of a failed split.
  3. Stale blocks occur because miners can mine a block at the same time, when the faster split wins the block is removed from split all using proof of work.
  4. It is important because stale blocks can occur, so you must wait six block confirmations.
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#2997

  1. What happens in the bitcoin network when two miners solve a block at the same time? They both get appended to the blockchain and begin to propagate through the network via the closest nodes to them.

  2. What is a stale block? A stale block is a block that was dropped

  3. How do stale blocks occur? It occurs when there are more then one block being appended to the chain around the same time and a miner chooses to add their block to a different block on the chain and that now becomes the longest chain and another miner adds thereā€™s to that chain and the other block that was on the chain that has not been added on to or has not been added on to as much as the other one is dropped and becomes a stale block and the transactions are returned to the mempool.

  4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction? It is best to wait for six blocks to have been confirmed to know for sure yours is truly on a block that is not going to be dropped.

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#2998

What happens in the bitcoin network when two miners solve a block at the same time? The longest blockchain will win and the other will become stale or orphaned
What is a stale block? A stale block is one that was competing and lost to a longer block.
How do stale blocks occur? Stale blocks happen when they lost the battle with longer blockchain
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 to make sure the block is not dropped

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#2999
  1. What happens in the bitcoin network when two miners solve a block at the same time?

Two valid blocks start propagating as the new nodes into the blockchain network, which results in a conflict producing stale/orphaned blocks.

  1. What is a stale block?

A stale block is a completely valid block, that used to be a part of the blockchain network, but got dropped out, due to the conflict with another block which was produced at the same time. A stale block became stale, because the subsequent block mined after that, chained itself to the competing block (the one produced at the same time).

How do stale blocks occur?

Stale blocks occur when two or more blocks are mined at the same time and one of them become a dead end. This means that the block after that chained itself to a different block, resulting in a longer chain. The blockchain always follows the rule of the longer chain. All the transactions in stale blocks return to the mempool.

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

Because when a new block gets mined, it has to propagate that information to all the nodes in the network, and sync with the blockchain. This usually takes 10 minutes or so.

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#3000

  1. Both blocks get validated but only the block that is chosen by the miner who produces the next block stay in the chain.

  2. the block that is not the chosen one

  3. they just get rejected and the chain continues with the chosen block while the rejected will be ignored.

  4. its the best to wait 6 blocks. in the case that the confirmed block was a stale block the transaction would not be valid.

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#3001

  1. Both blocks would be added to the chain, but one of them eventually dropped and returned to the mempool.

  2. A stale block is a fully validated block which got dropped from the chain.

  3. In the event of two blocks at the same time it depends on to which block the next block will be added. The longer chain will always survive and the block left behind will be send back to the mempool and eventually dropped.

  4. There is always a chance your transaction could be on a stale block and would be dropped.

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#3002
  1. They are both added to the blockchain until another miner mines the next block and adds it to one of the two blocks which results in a longer chain of PoW which wins. Once all nodes accept the winner, the other block is dropped and the transactions in that block get returned to the mempool.
  2. The block that gets dropped.
  3. Itā€™s important to wait for 6 confirmations in case your transaction is in a block that gets dropped after an initial confirmation.
#3003

I didnā€™t answer #3. A stale block when two blocks are mined at the same time and the other gets picked by the next miner to be in the blockchain by adding their block.

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#3004

  1. The two miners each send out their new updated version of the blockchain to other nodes to be verified.

  2. A stale block is a valid block(1) that is invalidated due to a different version of the blockchain with a different block(2) in its place that is confirmed first, deeming block(1) ā€œStaleā€ or ā€œOrphanedā€.

  3. A stale block occurs when 2 blocks are completed at the same time by two different miners. One is accepted and the other is ā€œStaleā€ and invalid.

  4. It is important to wait for more than one block to be confirmed during transactions to make sure that that version of the blockchain is the version that will be accepted by the entire network.

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#3005

When two miners solve a block at the same, the the blockchain is forked. There is now 2 versions of the truth. Then both blocks are mined on by various miners through out the network until the next block is solved. Whichever miner solves the next block then has the longest blockchain and the network refers to the longest solved blockchain to proceed with mining.

When two miners mine a block at the same time, the block that is not accepted as truth is the stale block.

How do stale blocks occur? After a fork, the blockchain with the shortest length is stale. The transactions in the stale block are then returned to the mempool.

Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction? Due to the occurrence of stale blocks, a transaction may be confirmed by one or both of the forks. However, if the transaction is only on the block that becomes the stale block, then the transaction is returned to the mempool and still needs to be accepted/confirmed.

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#3006

  1. Both blocks are propagated to network. When then the next block is produced and is added to one of both ones, the other block will be dropped to the mem pool, because the longest blockchain is accepted by the network.

  2. A stale block is a block that is removed from the blockchain and dropped back to the mem pool.

  3. Because the newly confirmed block can be removed from the blockchain.

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#3007
  1. a stale or orphaned block occurs
  2. a block that cannot be accepted to the blockchain
  3. when more than one block is created at exactly the same time
  4. to make sure that that no orphaned or stale blocks occur
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#3008
  1. although both will be recognised by their nearest nodes only one of the blocks will be validated by the network. The longest blockchain will win
    2)block that is valid but could not form a longer blockchain is dropped by the network and sent back to the menpool
  2. stale/orphaned block occurs if two blocks are produced at the same time. One will be dropped and the blockchain will continue with another
  3. ideally 6 confirmations are needed as this would mean that the block will not be dropped
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#3009

  1. When two miners solve a block at the same time, a third miner will resolve the conflict by arbitrarily selecting one of the blocks to base his block on.

  2. A stale block is one that ā€œlostā€ the race to be added to the blockchain.

  3. A stale block occurs when the miner of the block lost the race to put his block on the blockchain.

  4. It is important to wait to resolve mining conflicts where one or more miners have entered blocks on the blockchain at the same time. Generally, all conflicts can be resolved in 10 minutes

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