Homework on Stale Blocks

Blockchain and Bitcoin 101
#3974
  1. When this happens, two versions of the truth exist temporarirly, even though both are valid - until another block is solved that will make one truth longer - then the longest blockchain will be more true. the other will be removed from the blockchain.
  2. It is a successfully mined block that was on the network but was is a removed/dropped because it was not part of the longer chain of blocks of the network.
  3. Stale block occur when the block was created at the same time as another block
  4. Because of the possibility that a stale block might occur. Usuailly there is a wait for 6 conformations to avoid this possibility of the block being droped. This ensures the network sync and the reduces the risk of of the transaction being sent to the mempool.
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#3975
  1. When two miners solve a block at the same time in bitcoin network chain splits in two chains, but the
    block in the longest chain wins and other one is dropped so transactions are returned to mempool.
  2. Stale block is a dropped block moved to mempool.
  3. Stale blocks occur when two blocks are mined at the same time but only one validated.
  4. If there is no enough confirmations transaction could be staled.
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#3976
  1. Both blocks are added to the chain but one will drop , the longest chain will stay. The one that drops becomes ā€œorphanedā€ and returns to the Mempool
  2. A block that has been dropped from the Network and returned to the Mempool
  3. By two blocks being added to the network at around the same time , one of which will be dropped , which is the stale block
  4. To make sure the transaction is not in a stale block .
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#3977
  1. The chains compete until another miner makes one of the blocks longer, then the shorter block goes into the mempool.
  2. Stale (orphan) blocks are valid and verified blocks that have been rejected by the chain.
  3. When there is a time lag in the acceptance of the block into the chain.
  4. To be certain that it has been accepted by the chain.
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#3978

1. What happens in the bitcoin network when two miners solve a block at the same time?
Temporarily two blocks will exist in blockchain. However only one block will be accepted by the network eventually. The other block will get removed/ dropped from blockchain and TXs will return to the mempool.

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

3. How do stale blocks occur?
Stale blocks occur when two miners solve a block at the same time. When a new block was linked to the next block, a stale block occur. Because the network will pick longest chain in terms of PoW and there is only one version of truth.

4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
To avoid or minimize staled/orphan blocks.

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#3979

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

The blockchain gets temporarily forked, until another miner chooses one of the two and the longer chain remain. The block that got into the shorter chain, gets discarded and its transactions sent back to the mempool.

What is a stale block?

When two miners solve a block at the same time, the block that gets discarded for being in the shortest chain is called ā€œStaled Blockā€

How do stale blocks occur?

They occur when two miners solve a block at the same time and one of those get discarded.

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

Because the TX can be part of a stale block, one that itā€™s going to be discarded for being in the shorter chain.

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#3980

Waiting will not avoid or minimize stale blocks. It only ensures your tx is not part of it.

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#3981

1.The network waits for the 3 miner to validate one of their blocks by forming a new block after miner 1 or 2.
2.Its a block that is dropped from blockchain and sent to the mempool.
3.When two blocks are solved at the same time.
4.To make sure your block remains in the blockchain and is not dropped to the mempool.

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#3982 
What happens in the bitcoin network when two miners solve a block at the same time?

two completely valid chains emerge

What is a stale block?

Stale block is valid block which was dropped as it was part of shorter blockchain

How do stale blocks occur?

if two miners usually in geographically different zones mine new block in approx. same time and add it to the block chain. Then next block added will usually validate one chain and invalidate other as it is shorter. Then after some time shorter chain block is dropped and network re converge on larger chain.

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

To be sure that the transaction is confirmed by few other blocks and not part of Stale block

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#3983

1.The blockchain splits and longest chain survives.
2.A stale block is one that was a part of a split chain that was not as long as its competitors so it was transported to the mempool.
3.Being a part of a small competing chain.
4.Because the block could be dropped if another chain is longer.

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#3984
  1. What happens in the bitcoin network when two miners solve a block at the same time?

When two blocks are created at the same time, the block with the longest chain and most POW is the one thatā€™s accepted as truth and the transactions from the other block are added to the mempool.

  1. What is a stale block?

A stale block is a block that was in the blockchain at one time but was dropped because of another version of the blockchain without that block in it.

  1. How do stale blocks occur?

These occur when miners pick up an opposing block that was created at the same time and build a longer chain with the other block. The block that wasnā€™t built on is now dropped from the blockchain.

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

You need 6 confirmations because if another block is produced at the same time, these confirmations make sure that the longest block is accepted and added to the blockchain.

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#3985

  1. The Blockchain will split and the next block will decide which chain will go on.

  2. A stale block is a rejected block because a competing block was accepted.

  3. when the longer blockchain is accepted.

  4. to avoid an orphan block

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#3986

1- Both blocs are appended to the blockchain and distributed but to different nodes each.

2- It is the bloc who is left behind, meaning cancelled because on the shorter appended/distributed bockchain.

3- The block is returned into the mempool.

4- To make sure that our transaction is not included in a stale block, it is better waitig all the confirmations.

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#3987

What happens in the bitcoin network when two miners solve a block at the same time?
The blocks get propagated to the nodes and for a short time, two different versions of the blockchain exist. This is only until another miner adds a new block to one of the two versions, which decides which versions blockchain is longer and therefore will finally get propagated to all nodes.

What is a stale block?
Its the block that gets obsolete due to the other block winning

How do stale blocks occur?
By two miners mining a block at the same time. Only one of the blocks can be put in the blockchain.

Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
This removes the chance of the version of the blockchain containing a stale block. After a certain time, all nodes should be synced and its more reliable the version is true.

#3988

Thank you for pointing out!
Right! It is important to wait to make sure your tx is not in the stale block so you know your tx was executed properly.

#3989
  1. Both blocks are added to the 1 blockchain, now making 2 different blockchains/split blockchain - double blockchain event.
  2. It is a block that was dropped/removed during a (fork) double blockchain event because the Bitcoin protocol only allows 1 blockchain. The stale block returns to the mempool and waits for mining.
  3. In the event of a split blockchain/double blockchain, the protocol will automatically drop the added block(s) on the split blockchain with the least number of blocks.
  4. Waiting ensures there has been definitive confirmation and no stale block occurring within the blockchain.
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#3990

What happens in the bitcoin network when two miners solve a block at the same time?
When 2 miners solve a block at the same time, the blockchain forks and both blocks are temporarily appended to it until the block in the longest chain is determined. The transactions in the stale block that is dropped will be invalidated and return to the mempool.

What is a stale block?
A stale block is a block that was on the blockchain at one time and present on some nodes dropped and all transactions in the block get invalidated.

How do stale blocks occur?
Stale blocks occur when another version of the blockchain that is longer without those blocks in it.

Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
A transaction needs 6 confirmations before we can be sure the transaction is validated and the block it is in will not be dropped.

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#3991
  1. The longest blockchain is the real one, the shortest will be orphaned or rejected.
  2. A block that goes back to the mempool, waiting to be confirmed by the longest chain
  3. When thereā€™s two versions of the chains, both go through a check for the longest which stays, dropping the shortest version
  4. To make sure that the chain is the longest, if not your transaction goes back to the mempool
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#3992
  1. What happens in the bitcoin network when two miners solve a block at the same time?

The longest blockchain wins, the other is forgotten.
2. What is a stale block?
As a block that is part of the smaller discarded chain.
3. How do stale blocks occur? When the Chain it is part of is discarded.
4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction ?
To avoid sending transactions to a chain of blocks that can be later discarded.

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#3993

  1. The Block the most proof of work will be accepted, while the other one returns to the Mempool.

  2. A block wich was accepted and part of the blockchain, but got dropped.

  3. When multiple miners mine a valid block at the same time.

  4. Because in case of the occurance of a stale block, the block with my transaction might be dropped due to the length of the other Chain ( most proof of work ), wich will send my transactions backt to the mempool.

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