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4401  Alternate cryptocurrencies / Service Discussion (Altcoins) / Re: MAINTENANCE OR SCAM ( https://www.tradesatoshi.com/ ) on: November 16, 2016, 07:49:21 AM
I've never used them, but a quick search didn't deliver any scam-related results:

https://cse.google.com/cse?cx=016660200577587308545%3Aesf40ml9aag&ie=UTF-8&q=tradesatoshi.com&sa=Google+search#gsc.tab=0&gsc.q=tradesatoshi.com&gsc.sort=date

Offcourse, it wouldn't be the first exchange that turned scam, ran away or had to default... So there is no guarantee tradesatoshi will ever come back.

How long have they been down?
4402  Alternate cryptocurrencies / Mining (Altcoins) / Re: Mining rig on: November 15, 2016, 01:18:47 PM
It had been a long time since i last mined altcoins, but i had 2 spare dedicated boxes laying around and tested ZEC mining. Since we're talking about CPU mining, my servers had these CPU's:
1 x Xeon(R) CPU E3-1245 V2
1 x Xeon(R) CPU Dual L5420

The combined hashrate of 16 cores is around 30 S/s. the E3-1245 gets about 23 S/s, the L5410 around 7 S/s
4403  Economy / Economics / Re: bitcoins and P2P lending on: November 14, 2016, 01:38:03 PM
The only experience i have was a small test i did depositing 0.05BTC to btcjam little over a year ago.

I made (very) small investments into 12 projects.
I allways made sure the borrower had a good rating, i liked the project and the loan wasn't suspicious (suspicious, for example, are people that have repayed 5 BTC in the past, and suddenly try to take a 50 BTC loan).

After a year, i stopped my exeriment with the following statistics:
Net return: -21%
5/12 borrowers defaulted, 1/12 is more than a month late (so in the end, i suppose 50% of the borrowers will have defaulted on their loans).

I've depostited 0.05BTC, and i've withdrawn 0.032792 (using 3 transactions, each transaction requires a fee). Substracting the fee of 0.0003681 I payed when funding my account, i can say:

I have sent 0.05 BTC to btcjam, after a year and after both deposit and withdrawal fees, i have a total return of 0.0324239. So in the end, i've lost both a year of my time and 0.0175761BTC by investing on a p2p lending platform.
4404  Bitcoin / Development & Technical Discussion / Re: Double spend on: November 14, 2016, 11:19:26 AM
It's now making more sense after you explained it, I assume that's why exchanges and BTC services requires more then one confirmation most of the time ?

That is correct. As long as a transaction is unconfirmed, it only exists in the memory of the nodes. An attacker can actually generate a transaction spending input A with a very low fee, and directly afterwards create a second transaction spending input A but with a much larger fee.
Most miners will include the transaction with the larger fee into a block, voiding the first transaction. Only waiting for at least one confirmation will protect a service against this problem.
4405  Bitcoin / Development & Technical Discussion / Re: Double spend on: November 14, 2016, 11:05:36 AM
Once a transaction is added to a block, it's allmost impossible to doublespend the inputs, but as long as the transaction is unconfirmed, it's pretty easy to do so.

My best guess is that the person who wrote the wiki meanth that once your transaction is confirmed, it's protected against double-spending.

A successful doublespend is when two transactions with conflicting inputs are both included in a block.
The way i always understood the concept, double spending means only one of many transactions spending the same inputs is included in a block, the other one is cancelled. This is what makes it dangerous. You think you have received funds from somebody, but a completely different transaction spending the same input is included in a block, and your transaction is cancelled, hence, you are no longer payed.
4406  Bitcoin / Development & Technical Discussion / Re: Have a partial priv key, need help guessing missing characters, ink is blurry on: November 14, 2016, 11:01:44 AM
5 BTC is enough to make some effort... I participated in the quoted topic and gave some proof of concept examples in perl on how to tackle this problem (altough, an other member wrote a much better sollution in python), in case you need some extra assistance, you're always free to PM me Smiley
4407  Alternate cryptocurrencies / Mining (Altcoins) / Re: GUI MINER Cant find my CPU? on: November 10, 2016, 12:53:58 PM
As i dont pay my own electricity, i cant go - on mining bitcoins, but until i buy ASIC, what do you recommend doing with 100mhas/s

0.1 Gh/s will make you about 3 dollarcent a year, while ruining your computer.

Like it has been asked before, it would be a good thing to give us the complete picture to work with Wink

- is your electricity really free
- how much electricity can you use (it's not because it's free that you can use as much as you want... Your landlord might knock down your door, or your house might catch fire if your breakers aren't ok)
- what kind of PC do you have (let's find out if you can mine some CPU minable coins, don't expect to much tough)
- what kind of GPU is inside your PC
- do you have a budget you can spend
- which commandline were you executing when starting the OP?
- what is your technical knowledge?
4408  Other / Beginners & Help / Re: what is escrow transactions? on: November 09, 2016, 01:58:58 PM
Hey .. I have seen a bitcoin address written 'transaction' about 2 months ago but now it shows 'Escrow Transaction' what is it?

Can you show us this address? Where did you see it???
Maybe it was just a note on blockchain.info or something, but with the information you gave, i have no way of knowing what happened.
4409  Other / Meta / Re: Stake your Bitcoin address here on: November 07, 2016, 11:52:48 AM
Code:
-----BEGIN BITCOIN SIGNED MESSAGE-----
This is Crwth from Bitcointalk.org today is November 7, 2016

This is my address.

15LxBZ12C8VW5EsDVnRG8cnzJFAEDK9EQD

Please be advised. Thank you.
-----BEGIN SIGNATURE-----
H8dekP3Hc6SsvT8P3dnEmCt/iu2rYoTgKlWq2F5k+VIBKUBU5NAt+IFp/LoS59JP6/GbLzf2ED3i9aIMOf+JVrE=
-----END BITCOIN SIGNED MESSAGE-----

quoted that for you... I'll verify the sig with electrum and edit this post when successfull.

EDIT: can't seem to verify this one, not by using electrum, not by using https://tools.bitcoin.com/verify-message/ not by http://www.coinig.com/?adr=15LxBZ12C8VW5EsDVnRG8cnzJFAEDK9EQD&msg=This+is+Crwth+from+Bitcointalk.org+today+is+November+7%2C+2016%0D%0A%0D%0AThis+is+my+address.+%0D%0A%0D%0A15LxBZ12C8VW5EsDVnRG8cnzJFAEDK9EQD%0D%0A%0D%0APlease+be+advised.+Thank+you.&sig=H8dekP3Hc6SsvT8P3dnEmCt%2Fiu2rYoTgKlWq2F5k%2BVIBKUBU5NAt%2BIFp%2FLoS59JP6%2FGbLzf2ED3i9aIMOf%2BJVrE%3D

Maybe it's because of the many linebreaks... Maybe you can try a simpler message?
4410  Economy / Micro Earnings / Re: Vote the FaucetBox Alternatives on: November 07, 2016, 08:35:48 AM
It's not hard to write your own faucet from scratch, using json-rpc and running your own node.
I made a proof of concept which you can use to study how to do this, you can use the code as a basis if you wish:
https://github.com/mocacinno/simple_testnet_faucet
4411  Other / Meta / Re: Problems accessing bitcointalk on: October 31, 2016, 08:16:26 AM
In the last few days I have problems with accessing this forum, both on my laptop and mobile phone. I get the message that the response time is ti long and webpage can't be reached. And this happens no matter if I'm on my provider network or wi-fi.  Half of the day the page is unaccessible.
Does anyone else have similar problems?

yes, i have the exact same problem here (Western europe)... So my guess it's a server side problem (altough it's only an educated guess)
4412  Bitcoin / Project Development / Re: Howto for installing Testnet faucet? on: October 28, 2016, 10:08:57 AM
Hi guys,

Can anyone advise me in installing a testnet bitcoin faucet? I already have a webhosting and I can use various CMS (e.g. WP).

Thanks  Wink

I'd probably just install bitcoin core, and run a daemon in testnet mode... Then i would create a php/mysql script to use json-rpc in order to generate transactions when a claim was made. Especially when talking about testnet, it's all pretty basic stuff. Just a form an a captcha. When info is posted, enter the ip and timestamp into the db and check if a claim can be made. If true, either make a json-rpc call, or store the info into a db and run a cronjob to query the db and make the transaction on an hourly/daily basis)

You could probably use an open source script like this one to do the same thing:
https://github.com/tuaris/FaucetRPC

(disclaimer: just found this script by searching github, i have no idear if this one is secure).

EDIT: if it's 100% sure testnet only, i'd be willing to invest a couple of hours in order to write something up whenever i have some time (might take a couple of weeks tough)

Would be awesome, thanks. Yes, pure testnet  Wink
I'll check out the link too!

Since i had a couple of hours today, i quickly made a proof of concept testnet faucet:
https://github.com/mocacinno/simple_testnet_faucet

It's a PROOF OF CONCEPT TESTNET FAUCET, DO NOT RUN IT ON THE MAIN NET!!!!! It will work, but your funds will be drained in mere days
I did nothing, repeat nothing, to avoid abuse of this system, nor did i check for security vulnerabiltys...

If you want to use this faucet as a mainnet faucet, you'll have to extend/fix/patch this code and at least:
- check for possible vulnerabilitys
- add ref system (add a table, insert each address as a user, keep track of the referring user, when running cronjob.php insert record in the faucet table to pay out refferer)
- kick bots
- kick proxy's
- kick VPN's
- kick tor
- create blacklist
- create admin page
- add extra checks: 1 claim per ip, 1 claim per address,...
- add captcha
- make a nice gui
- add an installation script
- add bitcoin.conf sample
- implement session
- implement ad management
- test the hell out of it
- ...
4413  Bitcoin / Project Development / Re: Howto for installing Testnet faucet? on: October 27, 2016, 12:07:15 PM
Hi guys,

Can anyone advise me in installing a testnet bitcoin faucet? I already have a webhosting and I can use various CMS (e.g. WP).

Thanks  Wink

I'd probably just install bitcoin core, and run a daemon in testnet mode... Then i would create a php/mysql script to use json-rpc in order to generate transactions when a claim was made. Especially when talking about testnet, it's all pretty basic stuff. Just a form an a captcha. When info is posted, enter the ip and timestamp into the db and check if a claim can be made. If true, either make a json-rpc call, or store the info into a db and run a cronjob to query the db and make the transaction on an hourly/daily basis)

You could probably use an open source script like this one to do the same thing:
https://github.com/tuaris/FaucetRPC

(disclaimer: just found this script by searching github, i have no idear if this one is secure).

EDIT: if it's 100% sure testnet only, i'd be willing to invest a couple of hours in order to write something up whenever i have some time (might take a couple of weeks tough)
4414  Economy / Lending / Re: Loan of 0.01 on: October 26, 2016, 12:09:39 PM
Hi

I want to loan 0.01 btc for mining
I ask a little number of btc cause i want proof you to i'm trusted

Slrry for my bad english it's because i'm french

Please, read this tagged post, written by a trusted member and adjust your OP accordingly:

https://bitcointalk.org/index.php?topic=577765.0

Next to this, 0.01 is allmost 7 bucks nowadays (this is not a little number, considering there are a couple dozen accounts created each and every week with the sole purpose of asking for no-collateral loans), and taking loans for the sole purpose of building trust is heavily frowned upon by the community.
4415  Bitcoin / Project Development / Re: How would YOU handle this idea? on: October 24, 2016, 11:19:30 AM
If you're 100% sure your strategy works, go to a bank, take a mortgage of $100.000 on your house.
1,5% compounded daily will make 22.575.604 in one year. Banks in my country have a yearly intrest rate of about 3% at the moment, so you'll need to pay back ~103k-105k, and keep more than 22 million.

I can honestly say i don't really trust people that say they have a money making idear, but instead of using it themselfs, they publish it in an ebook... Always smells fishy to me.
4416  Economy / Games and rounds / Re: yobicode, free BTC on: October 21, 2016, 11:44:41 AM
hi new code please, I want to try Smiley
New code it is. Simple this time to avoid possible mistakes...
Guess the coins name and it's yours.
I want to ask, how to follow it in this thread ??
You will also need account at yobit.net as those codes can be redeemed there and only there.  

Daily micro-giveaway.

YOBIT4C8A8A077FE7B6D9655B33☀☁☂

Hint:Michael Jordan's nickname?
This one was easy Smiley
Thanks for the AIR Wink
4417  Other / MultiBit / Re: uncofirmed tr on: October 20, 2016, 11:02:57 AM
ok thank you

and one more question, when it drops? for 3 days, or smth like that? or my client will try to send this trans forever?

Can't answer you this either. There is no predefined timeframe for a node to forget about a transaction (altough i think there might be a default of 3 days. EDIT: https://github.com/gavinandresen/bitcoin-git/blob/master/src/main.h#L68), when the node restarts, the unconfirmed transactions will be gone from its memory. The node's owner can also set the maximum memory for the mempool, so i guess a transaction will also be forgotten when the node's memory is full.

Can't answer the question about the rebroadcasting either, not because there is no answer, but because i'm not familiar with multibit classic 0.5.19. For example, bitcoin core keeps rebroadcasting the transaction unless you keep your client off, abandon the transactor or zap your wallet. On the other hand, electrum for example, only broadcasts a transaction once (iirc)

If nobody can help you here (in this topic), you can ask this specific question (wether or not multibit classic 0.5.19 keeps rebroadcasting) in this subforum: https://bitcointalk.org/index.php?board=99.0
4418  Other / MultiBit / Re: uncofirmed tr on: October 20, 2016, 09:17:00 AM
so, probably, for the next hours it will be confirmed?

1080 min = 18 hrs

Not really, those numbers are averages... With a 20 satoshi per byte fee, you'll need to wait 30 to 1080 minutes on average (at this moment)... The miners are completely free to include transactions in their block, they do not have to include the oldest transactions first or something.

It's possible to add 20 satoshi's per byte and get added to the very next block 5 minutes later (on average roughly 10 minutes between blocks)... It's also possible you'll have to wait forever, and see your transaction dropped.
4419  Other / MultiBit / Re: uncofirmed tr on: October 20, 2016, 09:12:41 AM
This one:
https://blockchain.info/tx-index/94fc3abe8d3f1df56925d19dc006540f424e45e2188c99fddba78397c0772566

uses an unconfirmed input... So it cannot be confirmed before the input is confirmed i'm afraid...

Actually, after further investigation:
the output of 82f2af56de26a74b171d0af12ea3f84345f23214163df2818fc2b26beee7de2e is used as input for 94fc3abe8d3f1df56925d19dc006540f424e45e2188c99fddba78397c0772566

So, there's a problem with 82f2af56de26a74b171d0af12ea3f84345f23214163df2818fc2b26beee7de2e
This tx is 518 bytes and has a fee of 0.0001 BTC = 10.000 satoshi's... This is less than 20 satoshi's per byte, and is not enough

https://bitcoinfees.21.co/ recommands a fee of 80 satoshi's per byte at this moment... A 20 satoshi per byte fee currently has an AVERAGE waiting time of 30-1080 minutes
oh i got it, my fee for 82f2af56de26a74b171d0af12ea3f84345f23214163df2818fc2b26beee7de2e was too small

thanks

That is correct, and the second transaction uses the output of this transaction as an input... So it cannot be confirmed if the first one isn't...

The second one is 225 bytes and has a fee of 10.000 satoshi's, that's 44 satoshi's per byte... Even this fee is rather "problematic", but it's better than the first one.
4420  Other / MultiBit / Re: uncofirmed tr on: October 20, 2016, 09:02:56 AM
This one:
https://blockchain.info/tx-index/94fc3abe8d3f1df56925d19dc006540f424e45e2188c99fddba78397c0772566

uses an unconfirmed input... So it cannot be confirmed before the input is confirmed i'm afraid...

Actually, after further investigation:
the output of 82f2af56de26a74b171d0af12ea3f84345f23214163df2818fc2b26beee7de2e is used as input for 94fc3abe8d3f1df56925d19dc006540f424e45e2188c99fddba78397c0772566

So, there's a problem with 82f2af56de26a74b171d0af12ea3f84345f23214163df2818fc2b26beee7de2e
This tx is 518 bytes and has a fee of 0.0001 BTC = 10.000 satoshi's... This is less than 20 satoshi's per byte, and is not enough

https://bitcoinfees.21.co/ recommands a fee of 80 satoshi's per byte at this moment... A 20 satoshi per byte fee currently has an AVERAGE waiting time of 30-1080 minutes.

About your second question: there are options to "fix" this problem:
1) wait untill the transaction is "forgotten" by the nodes, make sure multibit doesn't re-broadcast the transaction (don't know if classic does this or not, you might have to inquire in the correct subforum)
2) double-spend the inputs of the first transaction, completely re-create the second one (i don't think multibit can do this by default, so it might be rather challenging to export the private keys needed to create a transaction doublespending the inputs)
3) CPFP or RBF might also work
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