Homework on Stale Blocks

[Jesus]

1. When two miners solve a block at the same time, the miner who has the longest block will ultimately be rewarded.

2. A stale block is a block that has part of the transactions but because it did not have the longest chain, it was not appended to the blockchain.

3. Stale blocks occur once confirmations are made for the block that was accepted as valid for the blockchain. The transactions from that stale block are sent back to the mempool for other miners to take.

4. To minimize the issue of stale blocks.

[Cashflow101]

1. It will choose the longest block and continue.

2, 3. A stale block is when 2 different miners are competiting each other who is the fastest to hash(more pow). One miner’s block got choose by the new one and contiune wins (longest block). The other miner who lost(shortest block), all of the data will be put back in the mempool.

4.It is important to have a 10min block time beacuse if not, more chains will competing each other, which will increase the chance of blocks becoming a stale block

[bithomie]

1. Both blocks will be appended to the last block and start to propagate across the network, then after some time the chain that is built on the longest will be selected as the source of truth and the block that was appended in the shorter leg will be abandoned and the txs will be sent back to the mempool
2. A stale block is a valid block that was once appended to the blockchain but abandoned as building on a longer chain won out so it is abandoned and trxs are released back to mempool (or the loser in the example of question 1)
3. When two miners discovers blocks at the same time and start to propagate the new chain through the network. When one of the chains get further developed then the other then the network chooses the longest chain and abandons the shorter chain, this creates a stale block and the transactions are released and placed back in the meme pool.
4. To mitigate the risk of your transaction becoming invalid due to it originally being confirmed in a block that is later orphaned.

[uP_CadeiraMan]

1. The block on the longest chain wins because the network selects the longest chain.

2. Stale blocks are the ones that were once confirmed in the blockchain but were rejected / removed because the network selected another new truth, the longest chain.

3. Stale blocks occur when two or more miners manage to solve a new block meeting the network target difficulty requirement and are both considered valid solutions. Then when new blocks are confirmed and are attached / liked to the longest chain, the network considers this new longest chain the true consensus achieved and invalidates the other shorter chain. The blocks in this chain are also invalidated and send back to the mempool and these are the stale blocks (perhaps the name comes from stalemate in chess?).

4. Because the above scenario can always occur. The more confirmations, theoretically it is safer to assume the transaction sent/received is more secured. Ivan recommends 6 confirmations (for bitcoin!). It is now my rule of thumb, inscribed in blood in the runestones!

[DigiCoin]

What happens in the bitcoin network when two miners solve a block at the same time?
-Then a thirth miner will come and will base his block on one of the blocks wich will makes the blockchain longer and the network will choose the longest blockchain,with the most
POW and the other block will be removed,its data will go back too the mempool.

What is a stale block?
-The stale block is the block wich falls off in the blockchain if 2 blocks are mined at the same time.

How do stale blocks occur?
-They occur when 2 miners produce a block at the same time,a thirth miner will base his block on one of this blocks,wich will be the blockchain and the other block will be the stale block.

Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
-Because it is best too wait 6 blocks too be sure youre transaction isnt in the stale block.

[BastardOfTheUniverse]

1. The blockchain will temporarily have two versions of the truth. Is this a soft fork?

2. Stale block is the block that gets in the shorter version of the blockchain.

3. Stale blocks occur when two or more blocks are mined at the same time the ones in the shorter versions of the blockchain is rejected and returned to the mempool.

4. Transaction always hava a potential of ending up in a stale block. Waiting for six confirmations is recommended to be sure that the transaction is permanently accepted by the blockchain.

[GoHackYourself9]

1 the two blocks will have to wait Until a new block is created out of one of them making a longer chain resulting in being confirmed. The orphaned block returns to the mempool.
2 a block that doesn’t have a successor.
3 when a block created at the same time finds a successor more quickely
4 to make sure there are no stale blocks.

[Arpiq]

1. Both miners are accepted until new blocks are added to one or the other in accordance of proof of work. 6 confirmation makes the winner fully confirmed and the looser goes back to the mempool.
2. Stale or Orphaned blocks have been added to the network once and got dropped over time.
3. In the process of competing miners the disproved side becomes stale block.
4. To avoid a fork and to make sure its secured.

[PNaarden]

What happens in the bitcoin network when two miners solve a block
at the same time?
The chain splits in two and the longest chain will win.

What is a stale block?The blocks that are dropped
and they wil return to the mempool

How do stale blocks occur?
Are blocks that are not accepted bij the chain and
are on the shortest chain which has not been chosen bij the network.

Why is it important to wait for more than one block
to be confirmed when sending or receiving a transaction?
Because you have to be sure that your block is accepted
bij the chain and if your transactions will be validated bij the Blockchain.
This conformation will make sure that you are not in a stale block.

[Zhanka]

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

It creates a circulation of 2 different blocks that are both good to be added to the chain (2 truths) for a short period of time, until the third miner comes and adds his block. The one that he chooses to add his block to will be accepted, as system accepts the longest chain. The other block becomes orphaned.

• What is a stale block?

Stale block is that other block that the third miner didn’t add the next one to, which resulted in that to be left out of chain.

• How do stale blocks occur?

They occur as a result of being a last link of a short blockchain. Most of the times it may happen because of the delay and uneven information distribution. Some nodes will ‘‘think’’ that this block is not true, as the have received an information about the ‘‘competitor’’ block earlier.

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

It is important to actually minimize issues like mentioned before, by giving time for the new block information even distribution among the nodes.

[Margo]

*** What happens in the bitcoin network when two miners solve a block at the same time?**
The block in the longest chain goes on and the block in the shorter chain is then stale.

*** What is a stale block?**
A stale block is a block in a shorter blockchain, thus that chain becomes stale and is orphaned.

*** How do stale blocks occur?**
When there is a longer blcokchain.

*** Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?**
To make sure the block you are in will not go stale.

[romancalderon]

1. The blockchain waits for the next miner to append his new block to one of the two mined blocks and the network will accept the longest blockchain with PoW. The block left out returns to the MEMPOOL.
2. A stale is block is the block that did not get appended to the blockchain after 6 confirmations.
3. After 6 confirmations the network accepts the longest block and the remains blocks are considered stale.
4. To avoid stale blocks, and allow the network to sync and validation.

[Fati]

1. The network accepts the longest blockchain with POW. The other block will be dropped back into mempool.

2. A block that is dropped back into mempool due to shorter chain.

3. Stale block is a result of nodes receiving different versions of blockchain as miners select different transactions. Only one version can continue on, so the block on the shorter chain is dropped.

4. The more blocks confirmed, the more certain transaction will be confirmed and not dropped.

[Roel]

@ivan

• What happens in the bitcoin network when two miners solve a block at the same time?
• What is a stale block?
• How do stale blocks occur?
• Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?

1. it depends on the next block created wich block will survive. The first next block will be the longest PoW and the other block will be rejected in the network. All transactions will return to the mempool.
2. the rejected block is a stale block or orphaned block, where all transactions will be put back in the mempool
3. when two valid blocks are created and the network selects the other block for the blockchain (because of higher value in PoW).
4. to be sure that the transaction is accepted and not returned in the mempool.

[KingArt]

What happens in the bitcoin network when two miners solve a block at the same time?
The blockchain temporarily splits until all nodes have confirmed the correct block

What is a stale block?
It’s a block that did not make on to the chain and the tx gets sent back to the mempool

How do stale blocks occur?
when two blocks are mined at the same time the block that has propagated through the entire network gets added to the chain and the other considered the stale block

Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
To make sure that your transaction is not part of an orphaned block. You need to allow time so the block is propagated and confirmed throughout the network

[Mukunda]

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

The next miner breaks the tie by choosing one block over the other to continue mining on, the longest pow chain wins the confirmation

2. What is a stale block?

A block that gets dropped when another longer version comes along and nulls the block before it is confirmed, synced and validated

3. How do stale blocks occur?

When the blockchain forks after two miners solve the block simultaneously, the block that does not propagate, is not confirmed by a third miners work falls off

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

To ensure the transaction wasn’t part of an orphaned block, that might be confirmed in he BC by several nodes but might fall off later. The rule is to wait 6 blocks to ensure the confirmation of tx

[MarcisB]

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

• Two versions of the blockchain are created. Some nodes get one version and some - the other.
• The version which is continued first (gets another new block first) is kept. The other one is dropped and transactions in the last block are returned to mempool.

2. What is a stale block?

• The block that didn’t get continued.

3. How do stale blocks occur?

• When two miners come up with a valid block at the same time (guess a node so that the hash is below target). Only one can be kept in the blockchain.

4. 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 block with your transaction will not be dropped. After 6 blocks it is considered safe.

[Moises]

1. One block will win and be added to the blockchain permanently and be the other will return its transactions to the mempool.
2. A stale block one not added to the blockchain who’s transactions are sent to the mempool also referred to as an orphaned block.
3. They occur when two blocks are mined at the same time.
4. Best practices dictate we wait to receive 6 network confirmations to assure its validity.

[sahowe1]

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

Both blocks are added temporarily, a fork in the chain is created.

What is a stale block?

A stale block is one the is unused, after the chain has been consolidated. The stale block is added to the mempool.

How do stale blocks occur?

New blocks are added to the the longest block and the other (stale) block is
removed.

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 10 minutes to allow for the possibility of stale blocks being created, and removed.

[DanBeeCee]

1. What happens in the bitcoin network when two miners solve a block at the same time?
   If two miners solves a block at the same time, one of their blocks will eventually be deemed a stale block and the other’s validated & added to the block chain.

2. What is a stale block?
   A stale block is a block who’s transactions are added back to the mempool because another, longer version of the block chain was chosen by other miners to add proceeding blocks to.

3. How do stale blocks occur?
   Stale blocks occur when two or more miners add new blocks at around same time, but only one version of the truth(block chain) can occur.

4. Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
   This is important because it ensures that the block containing your transaction will not be deemed an orphaned/stale block, thereby having your transaction sent back to the mempool.