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A separate chain is created temporarily and they compete until one chain becomes longer and all transactions contained within the defeated chain are returned to the mempool
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A stale block or orphaned block is a valid block that was created simultaneously as another vaIid block but is abandoned once it’s rival block has been confirmed by the network.
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They occur when two valid blocks mined at the same time compete to be propagated by the network and one of them loses. The losers block is then dropped.
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In order to prevent adding transactions to a stale block. 6 confirmations is the going amount.
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Bitcoin Basics
What happens in the bitcoin network when two miners solve a block at the same time?
The chain splits, and both end blocks will eventually be linked to the next block until one of the chains get longer by either faster mining or faster propagating. The longest chain is valid / accepted by the network and the other one is discarded.
What is a stale block?
The blocks that are linked to the discarded chain after the double mined block. The tx of stale blocks are are moved back to the mempool.
How do stale blocks occur?
When two blocks are mined at the same time they both get linked to the next block. Whichever block gets linked first makes up the longest chain and if it’s also more difficult than the short chain the short chain gets discarded. The discarded block is the “stale or orphan” block.
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What happens in the bitcoin network when two miners solve a block at the same time?
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What is a stale block?
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How do stale blocks occur?
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Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
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One of the two will eventually win over another. The longest blockchain will win and the shorter one will be dropped.
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Stable block aka orphaned block is the shortest block that got dropped because there was another version of the block that has been accepted and it was part of a longer blockchain.
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Stable blocks occur when two miners mine block at the same time.
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There has to be at least 6 blocks mined and confirmed after first one, so you can make sure it did not get dropped in the blockchain. If that doesnt happen, the unconfirmed block is returned back to the mempool.
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Can someone explain what happens to the transactions that are built into an orphan block?
- i am assuming that other successful blocks contain the transactions which are written to the blockchain…
- What happens in the bitcoin network when two miners solve a block at the same time?
Longest and bigger chain will exist, other created blocks will send to mempool. - What is a stale block?
Created block which was sended to mempool - How do stale blocks occur?
Miner with lower hashrate created block after faster one did it. After this, his block will be rejected - Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
Because network is huge, and we need to approve that biigest part take this blockchain and approve it
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- When two miners solve a block at the same time both blocks are valid and added to the blockchain at that node within the network and begin to propagate through the network.
- A stale block is a block that is valid but has been dropped or rejected from the network.
- Stale blocks occur when two miners solve a block at the same (or very close) time. Now the 2 valid version of the blockchain, lets call them Chain A and Chain B, propagate through the network nodes eventually another miner will solve the next block from either one of these chains, for this example lets say its added to Chain B. At this point the new block is added to Chain B which becomes the networks accepted true blockchain and the other block from Chain A is rejected by the network and is now considered a stale block.
- It is important to wait for more than one block confirmation when sending or receiving a transaction to validate that your transaction is fully committed to the blockchain and hasn’t been dropped in a stale block.
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- the one with longer chain will win
- it will called orphaned as it get shorter chain and ignored
- when 2 miners block 2 different but viable blocks. the one with shorter chain is the stale block.
- because transaction might failed on the orphaned block
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2 different blockchains (e.g. A & B) coexist if 2 miners mine a block at the same time.
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A stale block is a block that gets orphaned once…
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… a new miner mines the following block in blockchain B, making blockchain A version obsolete. The block that got mined at the same time is the stale block.
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Hence, waiting for confirmations is crucial to ensure your transactions is not in an orphaned block.
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Homework - Stale Blocks
Bitcoin Basics
What happens in the bitcoin network when two miners solve a block at the same time?
The network will wait until six other nodes confirm the accuracy of the offered blocks.
Meanwhile, other miners will start creating a new block based on the one they found.
What is a stale block?
A stale block is a block that the blockchain declared invalid because it decided a competing miner’s block had a better following.
How do stale blocks occur?
When two or more miners solve the puzzle simultaneously, the blockchain eventually will determine that one of their blocks is invalid (stale).
Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
It’s essential to ensure consensus on a winning block.
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—Stale Blocks —
- What happens in the bitcoin network when two miners solve a block at the same time?
As the solved block is picked up by other nodes in the network, eventually there will be a block that has a longer blockchain. The shorter block will be discarded and the transactions sent back to the mempool.
- What is a stale block?
A stale block is a block that was successfully mined to the blockchain, but then dropped because another block being mined at the same time was larger and therefore more successful.
- How do stale blocks occur?
Stale blocks happen when more than one block is being confirmed to the block chain at once, and the shortest one is dropped.
- Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
Waiting for more than one block to be confirmed reduces the quantity of stale blocks.
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- What happens in the bitcoin network when two miners solve a block at the same time?
Both versions of the blockchain will begin propagating throughout the network. Eventually one of the versions will be dropped in favor of the blockchain with the most proof of work.
- What is a stale block?
It is when one block is propagated throughout the network but at the same time another version of the blockchain with its own new block is propagated. If the other chain is accepted because it has a higher proof of work the new block on the chain not accepted will be dropped, called a stale block.
- How do stale blocks occur?
See #2
- Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
Because it is possible for a block to be a stale block or orphaned block after only 1 confirmation.
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What happens in the bitcoin network when two miners solve a block at the same time?
Each miner add his block to the network. The nodes will propagate the blocks resulting in two different versions of truth in the network. The miners will continue to mine the next block based on one of the two previous blocks. When the next block was found, this chain will be the truth for the whole network, because the longest chain always wins. -
What is a stale block?
This is a block that was already confirmed in the network, but got rejected afterwards. The transactions in the block will return to the unconfirmed pool. -
How do stale blocks occur?
Two concurrent versions of truth in the network.
The next mined block will decide which version will be accepted and the other rejected. -
Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
The propagation of the blocks on all nodes worldwide takes time to sync the whole network. Therefore it is necessary to wait for 6 confirmation steps to be sure that the block with the transaction was not a stale block that was rejected.
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One of them will become stale. The one with most links will prevail.
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A stale block is the one with the fewer links, which will be put back into the mempool.
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When a block becomes invalidated by a longer chain with more PoW.
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The block can become stale.
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- When two miners solve a block at the same time, the chain forks till one blockchain is longer.
-. It is a block that was one time in the blockchain but put back because there were other blocks in the blockchain longer or corupted.
-. Stale blocks occur when two blockchains are built simultaneously and one of those blockchains does not get used.
- It is important to wait for about 4 blocks to be confirmed to ensure that your block is used and not dropped from the blockchain.
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Once the block is orphaned they are returned to the mempool. 
- What happens in the bitcoin network when two miners solve a block at the same time?
The miner of the next block will choose which block to be linked on. This make this chain longer in terms of difficulties. The unlinked block will be dropped and transactions will be integrated again in mempool.
- What is a stale block?
It is a block that has been dropped from blockchain.
- How do stale blocks occur?
If 2 or more blocks are confirmed in the same period of time. These 2 or more blocks are linked to the same block.
- Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
If I wait 6 blocks I can consider the transaction confirmed, because of stale, block can be removed.
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- A fork happens. Leading to Stale Blocks because the network will choose the longes chain.
- A Stale Block - is a block that has been dropped (not confirmed) and the transaction goes back to the mempool.
- Stale blocks occur when 2 minors mine a block that is valid. Then, another minor appends to one of the block to continue the chain, leading to the network choosing the longes chain.
- It is important because it allows the block to be propagated through the network so everyone has the same source of truth. This reduces the risk of forks.
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The chain splits into two chains and the longest chain will be chosen and the other block wil be dumped and the all the transactions from the dumped block will return to the mempool.
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When a valid block gets dropped from the blockchain because there is a longer chain that was chosen.
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When a miner successfully finds a valid block, the node will broadcast this info to the entire network. But if there was another miner that finds a block at the same time, there will be a clash to decide which block will be added to the blockchain. The network would eventually choose and they will pick the one with longer chain and reject the other.
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To minimize the issue of stale block and orphaned block.
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- What happens in the bitcoin network when two miners solve a block at the same time?
Two parallel blockchains will exist for a short while until another miner builds another block on the his version of the blockchain. - What is a stale block?
A block that gets dropped because a longer version of the blockchain is accepted by the network. - How do stale blocks occur?
When a longer version of the blockchain is accepted somewhere else the blocks of the shorter blockchain get dropped. - Why is it important to wait for more than one block to be confirmed when sending or receiving a transaction?
Because the block might be dropped.
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1 if two miners solve the block at the same time, the next block appends to only to one of them and forms a longer chain. the block that was not added to by a subsequent block is dropped and transaction in the block return the the meme pool
2. The stale block is dropped and transactions in that block return to the meme pool
3. Stale blocks occur because that are created at the same time as another block but they are not used by the next miner to increase the length of the chain
4. It is important to wait in case one of the previous blocks in the chain is stale or orphaned and adding to a chain with a stale block will be worthless.
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