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October 20, 2018, 09:56:16 AM *
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1  Bitcoin / Development & Technical Discussion / How to increase bitcoin data storing size? Bitcoin colored coin? on: October 15, 2018, 04:20:16 AM
I heard about bitcoin colored coin?

What is it?

and bitcoin can store data other than transaction data up to 80 bytes?

If then, how to put data to transaction?

And then later how to extract that data for use?

and how to increase that 80 bytes size? and up to what size increasing possible?

Thanks.
2  Alternate cryptocurrencies / Announcements (Altcoins) / [ANN] GameCoin here! for game purchase method designed! on: October 09, 2018, 05:23:32 AM
Here is the new coin, GameCoin.
Its source code is same bitcoin, litecoin sourced, so same function with them, but more good. With 15 seconds block time, transaction confirmation is very fast.
And this gamecoin is for payment method of various game’s purchase, not only purchase game itself, but also in-game consumable items too.
So for this, we will make payment module and get partnership with various game companies, makers, and let them adopt this gamecoin as additional or only game payment method.

Here is detail of coin.
Abb  :  GMC
Total supply : 100,000,000
Premine : 100,000,000
Block generation time : 15 seconds

And price of 1 game coin is $10. So anyone who has 1 gamecoin should can buy $10 equivalent game item. For this, game company’s cooperation is essential.
And where you can get gamecoin? You should buy from us. Price is $9.9 per 1 gamecoin.
With that you can use at game purchase later. And also this coin will be listed on exchanges, then you can expect price rising too.

What most major difference of this gamecoin is that we do buy-back gamecoin, this is intended from the first original concept of this coin, so we buy-back gamecoin at 90% of $10, at $9.
With no question, no condition, we just buy whenever you request.

So if gamecoin holder spend gamecoin at game, then that game company need to make real cash from that coin, right, so for that role, we deal it. Just sell gamecoin to us, then we buy it and give you cash(mainly for now, Bitcoin).
Originally we don’t spend 90% of gamecoin sales and it will be permanently reserved for buy-back fund.
And with 10%, we will maintain our dev, marketing team and continues.

I will give gamecoin windows wallet, and there you can keep gamecoin. Web wallet, mobile wallet would be released soon.
Thanks for reading.
So please contact me for buy gamecoin now.


Telegram : @wsxdrfv
Skype : leegodskype
Email : wsxdrfv ( at ) hanmail ( dot ) net
3  Alternate cryptocurrencies / Altcoin Discussion / Can make fake coin? on: October 09, 2018, 05:11:22 AM
If there is some altcoin that cloned bitcoin, and the maker doesn't open the source code to github, and just released window's wallet (same with bitcoin window standalone core wallet), and web wallet for online.

And maintaining only 2 nodes at some VPS servers.

In this situation, someone can make fake coin and distribute? Like with 51% attack or via other way? How? How to block this abuse?

Thanks.
4  Bitcoin / Development & Technical Discussion / 51% attack can be done with no source code access? on: September 11, 2018, 01:59:14 PM
If some coin does not open its source code at github, and just open its windows/linux wallet only,

then some attacker can do 51% attack? with just mining power? how?
5  Bitcoin / Development & Technical Discussion / What this means? offline address/tx generation on: August 08, 2018, 03:47:29 AM
-------------
We have been trying to generate address + privateKey pair compatible with xxxcoin (using secp256r1 instead of `secp256k1`) and using your prefix (PUBKEY_ADDRESS = 50).
Here is the example of the address that we’ve got: MMyevnCKFexH8785tWVveFxyiE9YqMjGMX.
Unfortunately xxxcoin client replies as Invalid xxxCoin address

we are using bitcoinjs-lib to generate addresses (to be precise - this version `bitcoinjs-lib-secp256r1`).

Have you ever succeeded with offline address generation and offline transaction generation using any programming language?
------------

Some guy asked like above, then how can I reply?
xxxcoin is based on 0.8 version maxcoin (keccak algorithm), and  is now integrating process of some exchange.



6  Bitcoin / Development & Technical Discussion / How to know user deposit coins if exchange's coin daemon server is down? on: August 03, 2018, 08:39:18 AM
So scenario is, if some of exchange's user deposit coin to his address given by the exchange, but at that time that exchange's coin daemon server was down,

then how exchange know later those missing transactions and record all of them to own record DB?

manually type [ coind listtransactions ] and compare manually?

Aren't there more automatic handling way of this sort of problem?

7  Alternate cryptocurrencies / Altcoin Discussion / How to clone Ripple? on: August 01, 2018, 01:50:54 PM
How to clone ripple? Is the source code opened at github?

I am fascinating its unlimited coin supply.

THough I dont know how it unlimited works.

So they issue ripple coin on their own? Anytime just randomly?

Anyway, how to clone it and got ripple likely coin on my hand?
8  Bitcoin / Development & Technical Discussion / How to input custom data to blockchain? on: July 26, 2018, 03:41:04 AM
So bitcoin is just input number's data (how many bitcoin some address have) on top of blockchain, right?

And ethereum custom it and can input custom code into blockchain, right?

Then how input own custom datas into blockchain?

For this purpose, one should either clone ethereum or using ethereum?
9  Alternate cryptocurrencies / Altcoin Discussion / How is server's spec should be to compile coin? on: July 19, 2018, 06:22:13 AM
I tried to compile newest version of coin core at AWS's t2 micro EC2 instance, it fails with this erros.

---------
/usr/bin/ar: `u' modifier ignored since `D' is the default (see `U')
  CXX      gamecoind-bitcoind.o
  CXX      libbitcoin_server_a-addrdb.o
  CXX      libbitcoin_server_a-addrman.o
  CXX      libbitcoin_server_a-bloom.o
  CXX      libbitcoin_server_a-blockencodings.o
  CXX      libbitcoin_server_a-chain.o
  CXX      libbitcoin_server_a-checkpoints.o
  CXX      consensus/libbitcoin_server_a-tx_verify.o
  CXX      libbitcoin_server_a-httprpc.o
  CXX      libbitcoin_server_a-httpserver.o
  CXX      libbitcoin_server_a-init.o
virtual memory exhausted: Cannot allocate memory
Makefile:5658: recipe for target 'libbitcoin_server_a-init.o' failed
make[2]: *** [libbitcoin_server_a-init.o] Error 1

-------------

t2 micro spec is 1 cpu, 1g ram.

So ram shortage is reason of this error?

Then how much ram should be to compile?

4g? or 8g?

And how many cpu needed and how much ssh (or hdd) space needed?

Thanks.
10  Bitcoin / Development & Technical Discussion / Make multisig address not danger? on: July 16, 2018, 12:12:45 AM
Someone propose that I make getnewaddress and dumpprivkey that address,

he will do same at his wallet, and we exchange each other's privkey generated from above, then importprivkey.

and if I input coin to there, that become multisig, both signing need and safe.

Is this true?

No scam factor here?
11  Bitcoin / Development & Technical Discussion / How max money works? on: July 11, 2018, 08:46:13 AM
After I pre-mined whole max money at once, still I can earn mining reward when I mining.

And my immature balance shows over max_money variable I set at source code.

Then if I get and spend more than max money, what happen?

Is this normal, no problem?
12  Bitcoin / Development & Technical Discussion / One new block how many transactions it can process? on: July 07, 2018, 10:42:02 AM
I processed 100 around transactions at once via daemon console, by sendtoaddress command to same address.

I repeatedly typed keyboard fastly with up arrow key and enter key.

From A wallet that has 90 billion coin to B wallet.

50 million at one time sendtoaddress.

After did like 70~80 times, suddenly it says balance is 20, it should be 80 billion.

79 billion is at unconfirmed balance.

Why this happen? Other computer mining this coin, but it can't deal all those 70~80 transactions at one time, but 1~2 transactions at one block.

I see this phenomenon at first time, how describe this situation?
13  Bitcoin / Development & Technical Discussion / walletnotify possible options? on: July 05, 2018, 01:34:55 AM
I only know %s followed after walletnotify, and this is transaction ID's option,

are there other option like %x or %a  or whatever different to receive different variables?

Thanks.
14  Bitcoin / Development & Technical Discussion / How to make wallet address sanity check algorithm? on: June 25, 2018, 09:24:40 AM
As title, How to make coin's wallet address sanity check algorithm?

To block user's trial of send coin to wrong address or other coin's address.

15  Bitcoin / Bitcoin Technical Support / walletpassphrase change password or remove password? on: June 24, 2018, 11:43:39 AM
I know there is command that can change password , but are there also remove password and make wallet status as no password?

16  Alternate cryptocurrencies / Altcoin Discussion / walletnotify being called only 3 times? on: June 24, 2018, 09:06:03 AM
At .conf file's walletnotify option, I tested this with actual coin deposit to my daemon, and custom php script,

So coin daemon called this walletnotify only 3 times right?

1. When receive coin (confirmation = 0)

2. When 1's tx's confirmation become 1

3. When send coin


Is this right? or coin daemon calling more than these cases? What cases ?
17  Bitcoin / Development & Technical Discussion / If I forget wallet's password? on: June 24, 2018, 01:21:20 AM
I forget coin's window wallet program's password.

So I can't send coin.

Then this coin is lost forever?

Are there no restore method?

Just default qt wallet program.

18  Bitcoin / Development & Technical Discussion / How to increase transaction file size? on: June 22, 2018, 06:27:56 AM
I found that when try to send big number like 300,000 coin at once, then daemon become slow, then error says transaction size limit is over.

So I think this because, wallet try to gather many address's balance to make total 300,000, so when it become exceed size, then it errors, right?

So how can I increase this size at sourcecode?

19  Alternate cryptocurrencies / Altcoin Discussion / How to change coin's install directory? on: June 22, 2018, 06:23:17 AM
If I install coin at ubuntu root directroy, then it uses main ssd drive,

this is too pricy at amazon.web server, so how can I change directory to which download block datas?

I want to use more cheap and large size HDD drive for download large block datas.
20  Bitcoin / Development & Technical Discussion / wallet.dat file need periodical backup? or just one time? on: June 21, 2018, 03:09:29 AM
wallet.dat file is important,

1. so is it enough to backup it just once?

2. or should it be backup continuously?

I think 1 is right. Is this right?
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