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When two miners solve a block at the same time, the miner with the most proof of work and the longer block with the most difficulty will be accepted across the network. The other block will return to the mempool.
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A stale block is the block which was not accepted for processing by the network for confirmations and was returned to the mempool.
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Stale blocks occur when there is a collision of different miner’s blocks, competing for network acceptance thru proof of work and chain length. Due to the time frame (10 minutes) if the miner’s blocks are not work proven and lengthy enough, it will fail the criterion and will be overrun by another miner’s blocks, which have meet the standards. Therefore it will be deemed stale and returned to the mempool.
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When sending and receiving a transaction it is necessary to have six (6) confirmations which assures validity among the network, and adheres to the industry standards. As more than one (1) block is confirmed it guarantees consensus in the network.
Both blocks get accepted on different parts of the network and miners begin to mine on either block they received first. It is after the next few blocks get mined, the split gets resolved due to the longest chain rule (most PoW) 
Thank You! This is very helpful.
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It will all be depends on the next block, whichever block that the new block will be added to, or in other words, longer blockchain will be accepted through the network and the other block will be dropped and all its transaction will be sent to mempool.
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The block that has been dropped due to the next block following the other block as true version of blockchain.
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When there are 2 blocks created at the same time and one of them gets the longest chain the shorter one will occur to be a stale block.
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In order to prevent stale block and ending up with unconfirmed transactions.
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2 versions of the blockchain exist and get propagated to the network. The chain with the highest Proof of Work (PoW) - which depends on the number of blocks and the difficulty (low targets) of such blocks - is the one which “wins” and gets accepted by the network. As soon as new blocks are added on
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A stale block is a valid block part of a chain version (fork) which has been dropped due to a different chain with more PoW being used by the network.
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This might happen due to new blocks coming out too quickly and not having enough time to propagate to the whole network, resulting in different blocks competing, as in 2).
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If only 1 block is confirmed, then there is a chance of it becoming stale due to a competing chain with higher PoW. As an example, waiting for 6 more blocks, is usually considered a sufficient amount to be nearly sure that the chain has enough PoW to be considered valid without “competitors”.
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The network will then accept the miner that has the most PoW.
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A stale block, or orphaned block, is a block that was dropped from the chain.
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Stale blocks occur from the network choosing another chain that has more PoW causing the blocks on the current chain to be dropped.
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It is important to wait for confirmation to make sure the chain was accepted into the network.
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Both blocks are added to the blockchain creating a fork. Eventually one or the other will have another block added to it first. The first block added makes that fork in the chain longest and it will become the accepted blockchain and the other blockchain fork will have the duplicate block removed and it’s confirmed transactions will be added to the mempool again, to be added to the blockchain in another block.
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When the longest blockchain, after a fork, becomes the official and only blockchain, the blocks in the shorter blockchain, going all the way back to the fork are called stale blocks and these stale blocks are removed from the chain.
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Stale blocks occur when 2 miners create the next block in the chain at almost the same time. Even though the transactions in both blocks may be different, the blocks are legitimate blocks. This causes versions of 2 blockchains in the ecosystem. Each is legitimate and each contains confirmed transactions. One will become accepted and the other one will be dropped when the one becomes a longer blockchain than the other.
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It is recommended to wait until 6 blocks are added after the block containing your transaction. That way, any chance is small, of a fork in the chain occurring, and later having your confirmed transaction dropped due ending up on the shorter of the forks.
- When two miners produce a block at the same the one that is connected with the longest chain is accepted.
- The block that is not accepted by the blockchain is called a stale block.
- When a block does not get picked up by the longest chain and become a part of the main blockchain that is distributed worldwide.
- Because that block maybe stale and you are wasting energy time and money .
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What happens in the bitcoin network when two miners solve a block at the same time?
We get 2 versions of the same blockchain, until 1 of them gets longer than the other -
What is a stale block?
It’s a block whose transactions were in the blockchain at one time but then were dropped -
How do stale blocks occur?
When, by happenstance, at exactly the same time 2 blocks are solved, we get 2 chains of blocks for a short time. When one of these chains gets picked up by a miner and new blocks are appended to it, that chain becomes the longest. Since the other chain did not get propagated fast enough through the network, blocks of said chain are dropped (=are stale) and their contents (or transactions) are returned to the mempool -
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 transaction is included in the blockchain and not dropped/orphaned.
Why would you waste energy if you are just sending a transaction?
1)Temporary fork.
2-3)After temporary fork then next selected block will be seen as the longer chain, disgarding the other block making is a stale or orphan block.
4)To quick can and will create more orphan blocks.
- Temporary will blockchain split. Then will be valid that block which will be used and connected to mine following block after split.
- Block that was not chosen to carry on after split.
- Stale blocks occur, when two miners produce valid blocks same time.
- Because in case my transaction is in stale block and this block will be dropped, my transaction will go back to mempool as unconfirmed.
- Two versions of the new proposed blockchain can begin to propagate through the network.
- A proposed new block that was not able to be confirmed by the majority of the nodes in the network.
- When the majority of the nodes in the network confirm one of the propagating versions of the new chain, it becomes the new accepted chain, and the block that was added to the other proposed version gets dropped and becomes stale.
- To give the network time to propagate the block containing the transaction and allow nodes to confirm it as being part of the new chain.
If 2 miners successfully mine a block at the same blockheight ( both mined on the same previous block) the network will fork. So at the moment there will be 2 VALID blockchains with a different block at the end. Eventually all nodes will see these as both valid. (and confirmed)
TO handle these accidental forks, the rule in Bitcoin is that the longest chain with most proof of work will be chosen as the survivor. So it all depends on wich of these 2 valid versions of truth, the next miner mines a new block on top of it. Wich will make 1 blockchain longer than the other one. The transactions in the loosing block (wich are not included in the winning one, will go back to the mempool waiting to be mined again by another miner
1.) Whichever block has more proof of work gets to become part of the mempool, and the shorter one will be dropped.
2.) A block that was dropped because a block with more PoW was accepted into the mempool instead.
3.) Stale blocks occur because of blocks that are more valid/useful to the mempool taking their place.
4.) It makes sense to wait simply to be positive that your transaction is not in a stale block, and won’t be dropped from the mempool.
- the blockchain forks into two.
- stale block is a block that is dropped from the blockchain.
- stale blocks occur when two miners get there block into the blockchain at the same time and the other block that has less difficulty doing so gets dropped from the blockchain.
- Your trance action may be in a stale block so it might seem that your transaction has made it to the blockchain but it takes ten minutes for the whole network to update so there is a chance that your trance action is dropped from the chain.
Mempool is a place for unconfirmed transactions not blocks, those go on the blockchain
- the network waits for more blocks to be added to the two chains until one is determined to be longer. Then the smaller chain one is discarded and its transactions sent back to the mempool
- a block which has been rendered invalid by a longer chain
- two blocks get solved and submitted at exactly the same time, temporarily causing more than one chain to exist. Then one chain gets longer and the shorter one’s blocks become stale
- to protect against accepting the data of stale blocks and then having transactions reverted
- When two miners on the bitcoin network solve the block at the same time, they will start two different versions of the blockchain, but the one that ends up being longer, will be the one that is accepted as the blockchain that will be used going forward.
- A stale block is a block that is generated on the version of the blockchain that ends up being eliminated. .
- Stale block occur because it was not the chain that had the longest chain. The transactions would go back to the meme pool.
- It is important to wait for more than one block to confirm a transaction because you might be sending or receiving a transaction from a stale block.
- What happens in the bitcoin network when two miners solve a block at the same time?
The two block will propagate out creating 2 different chains. When the next block is added it will be added by a miner using only one of the chains. Once this new chain propagates PoW concensus will take the chain with the most work as the new true chain. This chain will replace the other creating an orphaned block. - What is a stale block?
See above - How do stale blocks occur?
See above - Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
To be certain your transaction gets into the chain and doesn’t become and orphaned block