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Why is it important to make sure that miners spend money (on electricity) while mining?
To create a hurdle for people to create value in the network and stop bad actors from double spending → need mining power (electricity) to create a block. Basically to allgin incentives -
Why would it be very difficult for someone to go back change a previously added block?
Because they would have to re-mine all the blocks up to the present time and make sure every other node operator agrees / has a copy of that new ledger. This costs a lot of money (electricity). -
How does the network regulate mining difficulty?
The more miners, the more difficult it is to mine! In technical terms: it lowers the target for the nonce. This target is what the miners have to guess -> the smaller the target the less of a window they can aim for and get right
- Why is it important to make sure that miners spend money (on electricity) while mining?
ans-so that miners abide by the rules of mining to get their share of incentive for their pow, - Why would it be very difficult for someone to go back change a previously added block?
ans-as new blocks would have basically the previous block’s hash, any back track costs the miner more electricity and an ample amount of time to remine all the blocks affected. - How does the network regulate mining difficulty?
ans-the network regulates mining by placing a low target which the miners have to keep on guessing for the desired nounce to get a hash rate that is lower than the target.
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it is important for minors to spend money on electricity, so they have incentive to follow the protocol and not break the rules. They will fail to mine new blocks and lose money on wasted electricity if they do so.
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It would be difficult for someone to go back and change a previously added block, because new hashes are based on the contents of the previous hash, so changing a previous hash would break the link between the subsequent hashes.
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The network regulates mining by increasing the difficulty of guessing the nonce as the number of miners increases and easier as the number of miners decreases.
A1. In order to solve the puzzle under the required constraints, miners need to use high-powered computers which consumes a lot of electricity. For that spend, miners are rewarded Bitcoins.
A2. If any alphanumeric number is changed in the hash, then every following block’s hash is also automatically changed. Therefore, it would be practically impossible to go back to change a previously added block without losing integrity because it means changing all blocks added after the change in all network nodes.
A3. According to the hash function, new hash which are composed of previous hash plus nonce plus new transactions, must be less than the target special number. This regulation makes mining more difficult as more Bitcoins are mined.
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Why is it important to make sure that miners spend money (on electricity) while mining?
So it is more convenient for them to play by the rules and be efficient.
To avoid miners trying to reverse or duplicate transactions, as it would be more expensive than mining -
Why would it be very difficult for someone to go back change a previously added block?
Because they´ll have to re mine all previous blocks and catch up with the ones that were mined while they were changing the transactions -
How does the network regulate mining difficulty?
By changing the target. the lower it is, the more difficult
1. Why is it important to make sure that miners spend money (on electricity) while mining?
So that they keep mining in order not to spend more than they make and they are incentivised to follow the rules to make that money.
2. Why would it be very difficult for someone to go back change a previously added block?
Because they would have to mine every block that is mined after they changed an entry. They would also have to mine all already existing blocks after the block that they are changing. Theoretically possible but practically impossible. One entity would need 51% of the hashing power to do it.
3. How does the network regulate mining difficulty?
The difficulty increases when there are more miners mining (increased hash rate), and the other way round. Since a new block should be mined approx. every 10 minutes this is important to be regulated. If the difficulty is low and there are a lot of miners blocks would get mined to quickly.
- Everyone would join and I would get difficult to block - since everyone wants to have a peace.
- because he would have to go back in time to fix the previous block but mine in real time further. They would need an alien super sopfisticated technology plus a time machine.
- the more miners at work the lower needs to be the target. with this procedure you controll the number of participants to a good extend plus the 10min. time frame for a limit.
you can tell I am not a techy by the choice of my words - hope thats reasonable. 
- This incentivizes them not to break the rules and attempt to double spend. They don’t want to waste the money they spent on electricity mining the block.
- Because each hash in a block is based off the previous block’s hash. So someone would have to change a block, then change all the other blocks and catch up to the front of the blockchain which is kinda impossible.
- It regulates it by making the target lower when more people are mining, making the nonce harder to guess
- Why is it important to make sure that miners spend money (on electricity) while mining?
So that there is an incentive for them. - Why would it be very difficult for someone to go back change a previously added block?
Because the link would be broken. - How does the network regulate mining difficulty?
How many miners there are. The more miners there are the harder it gets and the target number is lowered.
Why is it important to make sure that miners spend money (on electricity) while mining?
It is part of the control system of bitcoin. The miners must be incentivized to mine correctly. By requiring the use of electricity, it makes it a fraud deterrent.
Why would it be very difficult for someone to go back change a previously added block?
Someone would have to change the block hash, and the link, for every subsequent block.
How does the network regulate mining difficulty?
Target is low when difficulty is high. Target is high when difficulty is low. The competitive difficulty ensures minors are using electricity.
- Why is it important to make sure that miners spend money (on electricity) while mining?
It’s part of the PoW, Miners must follow the rules or they will lose money (block reward + txs fee + electricity)
- Why would it be very difficult for someone to go back and change a previously added block?
Each block has a hash which is a unique fingerprint based on all the previous tx in that particular block plus the hash of the previous blocks. Changing that block will invalidate the block and the following blocks.
- How does the network regulate mining difficulty?
The target depends on the difficulty of the BTC network, the more miners are in the network the lower the target is.
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Why is it important to make sure that miners spend money (on electricity) while mining?
It is the result of cause and effect. The effect of mining causes use of resources which is costly. This “cost” needs to be recouped, so an incentive to receive more than one produces is introduced. The cost of mining is really incidental. -
Why would it be very difficult for someone to go back change a previously added block?
A block is produced in a lineal format (chain). Blocks, chained together by agreed hash algorithms can only continue when they are in agreement. The resources to alter these agreed hashes far out-way the return received for such changes. -
How does the network regulate mining difficulty?
As the mining grows, the “target” hash result requires many more hash attempts (increase spending resources) to find a match. The rewards increase (hash fee) making this process more profitable, as the block rewards (bitcoins) decrease due to halving.
- The miners investment in electricity to mine creates an incentive for miners to follow the blockchain rules such as not changing data in previous blocks or producing extra outputs. The consequences of doing so would cause the miners to lose previous POW (work) that costed electricity and time to begin with. Causing more work for the same incentive.
- Because this change would effect 1 previous block and hash of the current block and every block/hash after it, causing the blocks to be mined again.
- By regulating the target number the lower the number, the more difficult it is to mine. The more miners, the lower the target number.
Nounce and target are two different numbers, nounce is a random number that guessed by miners.
1: It is important because it forces the miners to invest first before taking rewards. This keeps the miners honest & the integrity of the Blockchain intact.
2: Because then they would have to change every other previous added hash block after the one which they had changed, this task alone would take an unfathomed amount of time & computing power.
3: The Hash rate determines the mining difficulty in which the more miners the lower the target & the more difficult the ‘puzzle’ or nonce, is to solve.
That is good to know, I edited my comment to avoid confusing others.
Thanks
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Money spent on electricity is the investment a miner makes to gain a return on. Without this investment, the miners would not have any incentive to continue to secure and maintain the network.
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All blocks are hashed using information from the previous block. Changing informationn on one block would break the chain linking each of the subsequent blocks.
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As the number of miners increase, the target hash is lowered which raises the difficulty of discovering each nonce.
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Because it’s important that the miners prove that they find the nounce by working. This is the principle of proof of work consensus where miners have to work to be rewarded.
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If someone changes a previous added block, its hash will change and in this case, in order for the blockchain to be validated, the following block have to be also valid. Theorically, the miners can hash again the previous blocks but practically, it’s an enormous amount of work so it’s very difficult.
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When there is a lot of miners, the mining difficulty increases. The target under which a block’s hash must be is closer and closer to 0 so it becomes more difficult to find the correct hash.
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Why is it important to make sure that miners spend money (on electricity) while mining?
To make sure they follow the rules. If they break a rule their block will be rejected and they
lose money (spent electricity). -
Why would it be very difficult for someone to go back change a previously added block?
Changing a transaction in a previous block will create a new hash for that block, which will
then change the hash of the following block and so on…This will require re-hashing all
the blocks that follow, which in essence will be almost impossible to do because new
blocks will continue to be created and theoretically they would not be able to “catch up”. -
How does the network regulate mining difficulty?
The more miners that are working in the network, the higher the difficulty for them to solve the puzzle (guess the nonce). The target number will always be lower and lower as the difficulty increases.
1. Why is it important to make sure that miners spend money (on electricity) while mining?
By spending money on electricity miners have incentives to play by the rules to get the block reward and the transaction fees to make some profit out of it. If the miners try to cheat by changing the transaction data inside the previous blocks, they will be rejected by the blockchain and will lose money.
2. Why would it be very difficult for someone to go back change a previously added block?
If someone tries to go back and change a previously added block, it would break the link to the next block and the following blocks. Then they have to mine again and link the blocks again which is practically impossible.
3. How does the network regulate mining difficulty?
If there are many miners, the difficulty to guess the nonce is increased by lowering the target.