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News: Latest Bitcoin Core release: 27.1 [Torrent]
 
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21  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?
22  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?
23  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.
24  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?
25  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?
26  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?
27  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.
28  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.

29  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?

30  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 ?
31  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.

32  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?

33  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.
34  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?
35  Bitcoin / Development & Technical Discussion / MAX_MONEY's possible max value is? on: June 17, 2018, 02:57:06 AM
Its 92,000,000,000 ?

Int64's Max value is 9,223,372,036,854,775,807

But MAX_MONEY is multiply by satoshi, ( * COIN ) so it multiply by 10,000,000, right?

Then so max possible total coin supply (MAX_MONEY) is approx 92,000,000,000?
36  Bitcoin / Development & Technical Discussion / Daemon encryption not work? on: June 17, 2018, 02:49:38 AM
I typed command encryptwallet to my daemon, but stopped and not work?

How to solve?
37  Bitcoin / Development & Technical Discussion / If wallet.dat shared or stolen, then encrypt it? on: June 17, 2018, 02:47:55 AM
If A, B get same wallet.dat file, and after that, if B encrypt his computer's wallet program(or daemon) (B2), then what happen?

All coins received via address generated before encryption, B can use them also?

And all coins received via address generated after encryption, only B can use them?

And all coins received via address generated after encryption at A's computer (A2), A and B can use them?


Here [use] means spending coin.
38  Bitcoin / Development & Technical Discussion / Bitcoin walletnotify's confirmations number can be increased? on: June 14, 2018, 05:52:40 AM
So at bitcoin.conf file, there we can set walletnotify option, and it only called when some transaction's confirmations are 0 and 1.

Can we increase this number?

If can't, we should revise coin's source code itself? where?
39  Bitcoin / Development & Technical Discussion / How to decide transaction fee? on: June 12, 2018, 04:38:02 AM
So if I want to make custom wallet web application, how to make transaction fee part?

So there are wallets that enable user to choosing fee from 3 stages, (low, standard, high) speed rises as fee rises.

Make this is easy, but how to choose/or decide exact fee for those 3 stages?

And if this fee is decided, it is static forever? or should be changed at times?


40  Bitcoin / Development & Technical Discussion / getbalance, sendtoaddress require full sync with recent chain data? on: June 12, 2018, 02:48:06 AM
So I want to make cold wallet, so for that, I will buy another computer and install VM ware, install ubuntu, install coin-core program.

And then, generate address from there. Then if I send coin from outside, is cold wallet's coin core program can use console commands like

[getbalance], [sendtoaddress] ?

or it need to be synced, download most recent blockchain datas?

Because if this is true cold wallet, then it should be disconnected with internet, so I want to maintain this computer with unplugged internet lan cable.

Then when need to check balance or send coin to another address from cold wallet computer, then I should wait for sync?

Then, if I need to send fastly, cold wallet computer is also should be connected with internet?

How to solve this problem?

Thanks.
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