While the size in bytes matters, the age and size of the inputs also matters.
See the formular for priority [1].


I wouldnt call it an exploit. As long as someone along the chain does not accept zero confirmation transactions the "attack" fails. And you should not accept transactions without confirmations for several reasons anyway.


[1] https://en.bitcoin.it/wiki/Transaction_fees#Technical_info

As you allready know this all depends on the TX [1] which is 2207 bytes in size but only pays 1000 Satoshi in fees. 20000 Satoshi would be reasonable. This will take a while.


[1] https://blockchain.info/de/tx/6024d009d6bb318bd8edb74957ad5d32aba8ca856c42ba6197ea138a7019a24a

Ohne Englisch wirst Du da nicht weit kommen. Der dev guide [1] ist z.B. nicht übersetzt. Aber wenn Du Fragen zu einzelnen Themen hast bekommst Du sicher ne Antwort.


[1] https://bitcoin.org/en/developer-documentation

link for the lazy: https://www.blocktrail.com/BTC/tx/1d7749c65c90c32f5e2c036217a2574f3f4403da39174626b246eefa620b58d9

Its indeed rare and usually - at least from what I read - by accident. Some reported they got high fees back from the miners.

Hi, Dr. Nick [1]


Yes you can. One of the wallets might get confused by the actions of the other, but its possible.


Yes, as long as you can access the private keys you can spend your bitcon from any wallet. Usually each wallet allows you to export those in different formats. E.g. 5JkLqL4Me5E5b6JLS6WYU1rfXSQqx1enewSvtMRrcXzPLE6ymTe is the private key for the address 1DmZzQ65sL5BcpGzBKp3j7EdRHK9WtQmmx

which now should no longer be used.


I am not sure what you mean by "export my balance". You can export your private key and store it elsewhere, in which case you could still use the same address as before, its just that your private key would be now in two different places.


Where the private key is storred does not matter. The bitcoins are never "in" your wallet anyway. They are allways in the blockchain (not to be confused with blockchain.info which is just a service) and the person that is able to access the correct private key can move the funds. You could even make that private key public (as I did above) which would result in plenty people beeing able to spend the coins associated with it, but thats usually not what you want.

If you are thinking about safe offline wallets (e.g. paperwallets) its probably best to keep your existing online wallet and transfer larger amounts to your offline wallet for long term storrage.


[1] https://www.youtube.com/watch?v=YlmECL2ED2I

First, sorry for the late answer, didnt have the time for a length reply earlier. I see you got the partial quotes now


Yes, I used a different machine for that because I wanted to test how it would perform on old mobile hardware. Not as cold storrage but as a form of semi cold storrage but with a dedicated machine. I still think its as secure as it gets on a daily use computer, but as daily use computers go there is a higher risk for infections. That might not even be my fault. My main machine is also used by guests or family members, it takes USB devices from different people and not all of them know what they are doing when it comes to virusprotection. It is something I want to prepare for, but since I dont have that much to worry about cold storrage yet, I though about a dedicated machine. Another reason for testing armory was that it allows multisig and AFAIK its the only wallet thats currently supporting this. Would be nice to set up an address for the family that would require multiple passwords/keys to spend the funds.


Well the more addresses the more painfull it is to check the pages manually. I wrote a little Javaprogramm [1] a while back that is looking up a list of addresses via the blockchain.info API. Its basically just checking the site for you for each of the addresses and creates a file where it lists all balances
per address. Not sure if this is usefull for you, but it should be still downloadable via mega and the source is included.


I use a new address for every source of bitcoin. E.g. each signature campaign that paid me got its own address, the address in my profile changes from time to time. That way I know where the coins came from when I check in bitcoin core. IIRC electrum has something like this as well. Its just a little label because I wouldnt be able to remember the address string either. This also helps a bit with privacy, because if I gave everyone the same address theyd know how much I received and spend etc.


Yes, trezor would do this for you. The idea of hot and cold wallet is that you have two machines. One called cold because it is offline, where you have the private keys and one call hot because it is online, but it only knows the addresses not the private keys. Thus you have one wallet - the hot one - that knows how much bitcoin you can spend and one wallet that is actually able to confirm the spending of the coins. The way bitcoin works is that if you want to spend bitcoin you need to sign the transaction with your private key in order to make it legit. Otherwise anyone could spend your coins. Now in order to spend both machines have to work together. The cold wallet can not just create a transaction because it does not know how much bitcoin you have etc.; the hot wallet can create a transaction, but cant sign it because it has no access to the private keys. So in order to actually spend coins you have to create a new transaction with the hot wallet, transfer that unsigned transaction to the cold wallet, get it signed and transfer it back to let the network know about it. Trezor would be the cold wallet in this case, connected via USB to the hot wallet. The private keys never leave the device, it gets an unsigned transaction from the computer, signs and returns it. A virus would have to infect the Trezor in order to access your private keys and be able to spend your coins.



I had several they are all empty now, but I might create more once my coin arrives.


No they dont expire. Sorry for the confusion. I rented my signature for 60 days to silverwallets.com . My reward is that I got one for their coins that can hold a paperwallet behind a sticker. A paperwallet is just a private key printed on paper, yes.


There is no actual wallet, as in software. Most - if not all - wallets can however import the private key that is on paper. Its similar to the cold wallet idea. You have a private key on paper, so its offline and can not be attacked by a virus. You could lose it, it could burn in a fire, etc. Its not 100% either but it protects against all digital attacks. You can use the address to send coins there as much as you want without the need for the private key, only when you want to spend the coin you will type the private key into a secure and clean machine and create a transaction. It is very important that this transaction has to spend all the coins on the paperwallet, because the way bitcoin works there is something called change and not all wallets handle it the same, which could result in a loss. Let me try to explain change with an analogy. Bitcoin you receive is like a lump of gold. This lump can only be used entirely, if its worth 1 BTC and you want to spend 0.5 you need to melt it down and create two entirely new lumps of gold. One for the person you want to pay and one for you. Now some wallets just return your lump to the address it "came" from. The problem with this is that bitcoin does not use addresses on a protocoll level, its just an abstraction to help us humans understand what is happening. So back to the paperwallet. You have 1 BTC on it, want to spend 0.5 and the change either goes "back" or to a new address depending on the wallet software you use to do this. In any case your paperwallet should not be used again, but its better to create a new one and send the change there.



[1] https://bitcointalk.org/index.php?topic=736607.msg8355029#msg8355029

Vitacoin sind keine Bitcoin, Du kannst mit Bitcoin core keine Vitacoin verwalten. Hattest Du vorher Bitcoin?

Just a wild guess, but given that the propabiltiy of finding a private key for a certain address (e.g. one that has coins) is roughly the same as finding a single bucky ball [1] within the earths crust I am pretty sure it stands a deeper analysis.


Didnt watch it fully, but I like it.

[1] https://en.wikipedia.org/wiki/Buckminsterfullerene

Transaction fees are part of the coinbase transaction.

I have a feeling you dont even understand my point. Again, as discussion is still a discussion even if its not directed at solving anything. The post in question however has no value towards a discussion as it is not part of a discussion, even a "+1" has more value even though I would still consider it spam. Than again, maybe I dont know enough about the thread in question to judge how meaning full "yeall Ill retweet" that is in the context of the thread. Maybe it would surprise me.

The forums stance regarding scams is well known and just because there are thieves out there does not make your post appear less spammy, at least to me. In the end my personal opinion does matter very little anyway, but I doubt you will have a chance convincing the moderation team. In the end this is a privatly run forum and noone here is remotly able to cenor you in your ability to speak publicly you may just have to do so elsewhere.

A discussion is still a discussion even when there is no solution. You can try to twist my words all you want, but as you yourself said its promotion, not a discussion. Actually its not even promotion its just the confirmation of a possibly promotional tweet. When someone deems it low value / spam that someone can report the post, a staff member will review this and if they think the same the post gets deleted.
How is: "yeah Ill retweet that" a meaningfull part of a conversation? How is it important to post that? It is not and would I have encountered it, I would have reported it aswell.

What is your argument here? Is it: "only because you're chef ramsey" is contributing to a discussion in a meaningfull way? Because just because your comment got deleted does not mean you are censored. The sentence confirming you retweet something has no value for anyone but the person you retweet it for and that person would know about it via twitter.
Just because your comment is not "+1" but a little longer does not magically give it value in terms of a discussion and after all this is a discussionboard.

While the above is true, you cant just deposit 1 BTC, sell, buy 20 BTC and be on your way.

The way it works is that your position is worth 20 fold, thus if the price moves 5% (1/20) you are either broke or have doubled.

Jup, 1 in 2¹⁶⁰ multiplied by the number of private keys that have spendable coins on them. In order words: dont even bother.


If you guess the correct key you have access to the funds there. Since there are 2⁹⁶ private keys for each address it does not even have to be that same exact private key. Encryption does not matter in this case. Its like guessing a password. The private keys are only encrypted so your wallet file is harder to temper with.


Chances to find a lost chest a pirate burried are higher than finding a private key that has coins.

Currency systems are usually singulare tantum, e.g. its 1 Euro, 2 Euro, etc. There just is no plural of the word even though its commonly used as Euros. The word "Euros" would refer to a number of coins, but not the value the currency represents. All that aside, Bitcoin has no central authority that can just define the grammatical rules for the words refering to it.

bitcoin.org refers [1] to several coins as bitcoins



[1] https://bitcoin.org/en/bitcoin-for-individuals

Hab ich immer noch keine Vorstellung davon was Du anders gemacht hast als ich und entsprechend wenig Ideen wie ich Dir helfen kann.

How do you know that? It was not found in the blockchain data, but in the executable.

I just like to play around with plenty wallets. I like Electrum as well as Armory and I had no problems with Armory itself. The machine I used for testing was just very slow (single core 1Ghz/1GB ram) so it took a few days to sync and a few days to build the database.


Sure. Thats what I like about Electrum the most: a single backup, but other wallets start the implement "HD" as well, so this is no longer Electrum exclusiv.


It will not get any data when you are offline, but in order to check your balance you dont even need your wallet file. Just write (or copy paste) your bitcoin address and create a link for a blockchain explorer. E.g.:

https://www.blocktrail.com/BTC/address/18WgDVuiGY4A4mB8YEmVggEfSmFUUKxDcJ

there are plenty explorers like this and since the blockchain is publicly available you can check your balance at any time from any machine as long as you know the address. Make a bookmark, memorize it if you want.
You only need your wallet file with the private keys, protected by your password when you want to spend bitcoin.


Not necessary the way you described it would be semi-cold. You have a wallet that has the private keys and when you want to spend bitcoin it is online (hot), but most of the time you keep your wallet offline (cold) and check in from time to time, but you do so without using your wallet. Its not proper cold storrage as that usually implys that the machine storring your private keys is never online. It could be a old machine sitting in a corner, turned off. When you want to spend coins you create a transaction with your regular wallet (hot) on your main machine thats online and daily used. This machine however can only create an unsigned transaction as it has no access to the private keys. It only knows which addresses you have private keys for somewhere else and monitors them for you. You would then copy that unsigned transaction to the offline machine, get it signed and copy it back to the online machine to broadcast it to the network.
Your semi cold version offers a little less security, but you also only need a single machine, with an external storrage for the wallet file. The external storrage could e.g. be an USB stick that you use for your wallet file only and keep it in a safe place.



Similar to the old machine above a hardware wallet like trezor can do the same job, but its not a fully fledged computer. Its just a little devices build for the specific purpose. It makes the whole "create unsigned tx, copy it, get it signed, copy it back"-process very easy.


Its not actually that complicated. There are plenty of resources where you can make one online. My problem usually is that I have a hard time trusting the homepage and thats where the complicated part starts. Download the source, verifiy the source, generate the keys (best offline with an OS thats also verified and on a DVD/CD), print it and make sure the printer does not safe a copy, etc. I like BIP38 though as it protects the paper wallet with a password, so even if the printer keeps a copy it can not be used.

Since my 60 days for silverwallet are now over I soon expect my coin to arrive in the next weeks and Ill have to think about paperwallets again. I am not entirely sure If I want to use it as wallet or just keep it as a shiny token to play around with.


I know. I just copy the frist line, e.g.:
remove the parts I think are no longer needed and fill in the "end of quote" marks by hand.

Base58 ("O","I","l" and "0" excluded) is not the reason behind this. A private key is actually a 256bit number as well as the public key, but besides SHA256 also RIPEMD-160 is used and offers "only" 160 Bit. Thus there are 2⁹⁶ valid private keys for each address. The Base58 encoding you are refering to is just the final step [1].


[1] https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses