Answer: P = 1 - (364343) 22!/365^22 ~ 50%
Can you calculate the probability of a classroom with n children, all having different names, all being blindfolded, all taking a seat randomly, and no kid finds their own seat, which is tagged with their name?
Topic: Lost Bitcoins (Read 14269 times)
Now tell me, how likely is it that someone would reproduce my sentence (key):
"Ik heb de Mont Ventoux drie keer opgefietst en de Elfstedentocht even vaak geschaatst."
"Ik heb de Mont Ventoux drie keer opgefietst en de Elfstedentocht even vaak geschaatst."
The key doesn't have to be random. It just has to be unlikely to be duplicated whether accidently or on purpose. I guess a phrase like that might never be duplicated, but you might be surprised.
Consider the birthday problem: There are 365 days in a year. In a room with 23 people, what are the chances that two people in the room have the same birthday? It's a lot higher than you think. Answer: 50%
Thanks guys. Maybe I didn't express my thoughts clearly enough, but I did not lose any coins, yet. I was just wondering why people lose coins if all can be restored by remembering the private key. BTW I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence, which you encrypt and hash on a stand alone (offline) computer. The FBI confiscated BTC170,000, now why wouldn't these 'criminals' (or their partners) have moved these coins to another wallet, or were the FBI-agents smart enough to do this themselves already. Hmm, just thinking out loud again ...
It's not that easy. The problem is, most Bitcoin clients generate a new address every time you send money where the change is transferred to (see https://en.bitcoin.it/wiki/Change). So you'd have to memorize a new private key everytime you spend money. To circumvent this you can use a deterministic wallet like armory. It generates a unique "seed" that you need to memorize and can regenerate every address then.
Now tell me, how likely is it that someone would reproduce my sentence (key):
"Ik heb de Mont Ventoux drie keer opgefietst en de Elfstedentocht even vaak geschaatst."
Of course it is stupid to use some sort of general phrase. One has to make it real personal, and certainly not create it via brainwallet. One more thing, if you prefer to generate a random number by a computer (Andreas Antonopoulos warned about a bug in Linux; random is not so random these days) and you lose it then there is no way ever to get your coins back. My brain can. BTW this "drie keer" in itself means three times also implying three hash runs. Let's say, everyone his own bite.
"Ik heb de Mont Ventoux drie keer opgefietst en de Elfstedentocht even vaak geschaatst."
Of course it is stupid to use some sort of general phrase. One has to make it real personal, and certainly not create it via brainwallet. One more thing, if you prefer to generate a random number by a computer (Andreas Antonopoulos warned about a bug in Linux; random is not so random these days) and you lose it then there is no way ever to get your coins back. My brain can. BTW this "drie keer" in itself means three times also implying three hash runs. Let's say, everyone his own bite.
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I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence
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This is generally a very bad idea.I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence
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Human minds are wired for patterns and are VERY bad at randomness. Brain wallets have a significant risk of loss due to collision (either intentional, or accidental).
Just one of MANY examples from this forum:
https://bitcointalksearch.org/topic/finders-keepers-i-found-an-address-with-50-btc-via-brain-wallet-421559
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I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence
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I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence
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This is generally a very bad idea.
Care for an explanation?
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I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence
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I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence
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This is generally a very bad idea.
Thanks guys. Maybe I didn't express my thoughts clearly enough, but I did not lose any coins, yet. I was just wondering why people lose coins if all can be restored by remembering the private key. BTW I think the safest place to store a private key is in your own brain; of course not in the form of a completely random string of characters, albeit as a quite unique sentence, which you encrypt and hash on a stand alone (offline) computer. The FBI confiscated BTC170,000, now why wouldn't these 'criminals' (or their partners) have moved these coins to another wallet, or were the FBI-agents smart enough to do this themselves already. Hmm, just thinking out loud again ...
That's great. But, just to be sure, assume that I lost my wallet; completely, no back up. And all I do remember is my private key, can I restore (or recreate) the same wallet including all the coins?
Yes, as long as you have memorized the private keys for all the addresses that have coins -- but why would you not back up a wallet? That seems like an obvious mistake (as well as not encrypting it). Furthermore, why would you back up your wallet in your brain?
What if ....
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
If you know the private key, then you can access the coins:
https://en.bitcoin.it/wiki/Private_key
Just as if you wrote the key down or printed it.
Thanks for this answer. The info reads:
Quote
The private key is mathematically related to the Bitcoin address, and is designed so that the Bitcoin address can be calculated from the private key, but importantly, the same cannot be done in reverse.
That's great. But, just to be sure, assume that I lost my wallet; completely, no back up. And all I do remember is my private key, can I restore (or recreate) the same wallet including all the coins?
Hey,
If you go to bitaddress.org and click on "wallet details" and then enter your private key, it will give you the public address. The problem is that most people can't remember their private key, but if you can do so, that is enough.
For example, this private key:
5JntzqqXVhR8SBRvFWQhrtv3UXRqovnnfaij4FFT5nCAswFoqkx
Generates this address:
14MR8Li8Fna4d43PfY2f2XRp6GAbPM5swJ
You can go there, hit single wallet, copy the private key and then hit wallet details and see if it regenerates the address you just created.
You want to be safe doing that though - off-line, incognito window at minimum, quit when done, restart, if you have any significant numbers of bitcoins there. Bitaddress.org is reputable, however it is best to be safe and those are the minimum steps I'd take.
:-)
What if ....
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
If you know the private key, then you can access the coins:
https://en.bitcoin.it/wiki/Private_key
Just as if you wrote the key down or printed it.
Thanks for this answer. The info reads:
Quote
The private key is mathematically related to the Bitcoin address, and is designed so that the Bitcoin address can be calculated from the private key, but importantly, the same cannot be done in reverse.
That's great. But, just to be sure, assume that I lost my wallet; completely, no back up. And all I do remember is my private key, can I restore (or recreate) the same wallet including all the coins?
As I understand it:
The Bitcoin address is a sha-256 hash of the public key.
The Bitcoin address is a sha-256 hash of the public key.
The bitcoin address is a base58check encoded RIPEMD-160 hash of a SHA-256 hash of the public key.
As I understand it:
The Bitcoin address is a sha-256 hash of the public key.
The "private key" isn't really a private key but more a public/private keypair.
Yes you can easily extract a public key and bitcoin address from a private key.
Go to www.bitaddress.org and fill in a private key under the tab wallet details... it will give you the address.
+1.
You are not keep the coin, but the private key in the wallet. The wallet software has a copy of your private key,
so it can send on behalf of you. If your computer is compromised, so does the wallet and your key.
The information on how many coin do you have is in the block chain. All the transaction history is there, and the
wallet calculate how many bitcoin you own based on that information.
What if ....
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
As I understand it:
The Bitcoin address is a sha-256 hash of the public key.
The "private key" isn't really a private key but more a public/private keypair.
Yes you can easily extract a public key and bitcoin address from a private key.
Go to www.bitaddress.org and fill in a private key under the tab wallet details... it will give you the address.
SEND lost bitcoins here lol
What if ....
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
If you know the private key, then you can access the coins:
https://en.bitcoin.it/wiki/Private_key
Just as if you wrote the key down or printed it.
What if ....
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
Someone was a bit nonchalant and did not back up his/her coins, but ... But he/she remembers his/her private key. Is there a way to 'restore' these 'lost' coins? IOW, is there a way to match private key and a specific address in the block-chain?
Why does it seem like 99% of necro-posts are useless drivel based on idle speculation and fanciful imagination rather than well thought out logic based on facts and reality?
Because life without joy and imagination is scarcely living. And because if you behave arrogantly everyone thinks you have a teeny-tiny wee-wee.Neither of those answer why necro-posts suffer from delusions at a significantly higher rate than non-necro-posts.
Why does it seem like 99% of necro-posts are useless drivel based on idle speculation and fanciful imagination rather than well thought out logic based on facts and reality?
Because life without joy and imagination is scarcely living. And because if you behave arrogantly everyone thinks you have a teeny-tiny wee-wee.
According to current technology, there is no way to recover the lost bitcoins. Can quantum computing recover?
Oh boy.
Sure, but quantum computing can recover them only if they are truly lost. If the keys are hidden in a safe, there is nothing that quantum can do. Truly magical that quantum thing.
Lost means no one knows private key. Quantum computing is used to guess private key, no matter it is lost or not.
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