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1  Bitcoin / Development & Technical Discussion / scriptPubKey.size() > nMaxDatacarrierBytes on: August 10, 2018, 03:17:47 AM
In bitcoin core v0.15.1 , policy,cpp, IsStandard() , the condition (scriptPubKey.size() > nMaxDatacarrierBytes) is met, and so it gives error of {"code"=>-26, "message"=>"64: scriptpubkey"}

What do we check the size of scriptPubKey against a number ?
2  Bitcoin / Development & Technical Discussion / Change genesis block, regtest mining fail on: August 06, 2018, 02:22:22 AM
after i change genesis block in chainparams.cpp, i do mining in regtest mode.

Quote
$ bitcoin-cli -datadir=../datadir2/  generate 101
[
]
the return result is empty. However, i can see new blocks created in debug.log

Quote
CreateNewBlock(): block weight: 900 txs: 0 fees: 0 sigops 400
2018-08-02 08:15:24   nProofOfWorkLimit = 545259519  before bounds
2018-08-02 08:15:24   nProofOfWorkLimit = 545259519  before bounds
2018-08-02 08:15:24   nProofOfWorkLimit = 545259519  before bounds

i found out the reason , in regtest mode, after changing the genesis block, in bitcoin core mining.cpp, generateBlocks() call CheckProofOfWork(), the parameter passed to the function, includes hash value of block, so in CheckProofOfWork() , the line `if (UintToArith256(hash) > bnTarget)`   is fulfilled and returns false, so mining fails.

Why changing of genesis block causing mining to fail in regtest ?
3  Alternate cryptocurrencies / Altcoin Discussion / Regtest: change the genesis block , can only mine one block on: August 03, 2018, 03:10:41 AM
I use bitcoin core 0.15.1 , and change the new genesis block, [by changing the timestamp in createGenesisBlock function, and change the parameters passed to createGenesisBlock, such as CreateGenesisBlock(1231006508, 1170854509, 0x1d00ffff, 1, 50 * COIN) ]

After that , i call bitcoin-ci -regtest generate 1, it can only mine one block. Subsequently, the mining is not successful, as follows:

Quote
src/bitcoin-cli -regtest  generate 1
[
]


Does anyone experience the same problem?
4  Bitcoin / Development & Technical Discussion / cpuminer requires at least two bitcoin nodes to run on: June 25, 2018, 07:18:26 AM
i download this cpuminer on a cusmotmised blockchain that has different genesis block. i notice it requires at least two bitcoin nodes to run.

Is it due to the consensus algo ?

this is the cpuminer link  https://github.com/pooler/cpuminer
5  Bitcoin / Bitcoin Technical Support / dump public key from bitcoin-cli on: June 22, 2018, 06:58:37 AM
in bitcoin-cli, there is function to dump private address.

Is there any function to dump public address?
6  Bitcoin / Development & Technical Discussion / Generate public key for mining genesis block on: May 25, 2018, 06:36:44 AM
in chainparams.cpp, a public key is used to mine genesis block:

Code:
048E794284AD7E4D776919BDA05CDD38447D89B436BDAF5F65EBE9D7AD3A0B084908B88162BB60B1AA5ED6542063A30FC9584A335F656A54CD9F66D6C742B67F55

How to generate similar public key using ecdsa library ?
7  Bitcoin / Development & Technical Discussion / start bitcoin core private blockchain on: May 24, 2018, 05:36:06 AM
To start a customised private bitcoin core blockchain, all i need to do is:

1) change the genesis block
2) change the timestamp of genesis block

is there anything else?
8  Bitcoin / Development & Technical Discussion / send bitcoin from BTC network to BCH network on: April 20, 2018, 03:09:59 AM
I read this https://bitcoin.stackexchange.com/questions/57419/what-would-happen-if-you-send-bitcoin-btc-to-a-bitcoin-cash-bch-aka-bcc-add

I am not sure about the below:

After the implementation of reply protection, is it not possible to send bitcoin from BTC to BCH network , and vice versa?
9  Bitcoin / Development & Technical Discussion / Bitcoin transaction and Open Asset Protocol on: March 30, 2018, 09:15:06 AM
In Bitcoin transaction, it can have multiple vin and vout. In vout, it contains bitcoin script. In bitcoin script, the OP_RETURN contains payload, the payload is used to store Open Asset asset id and quantity (see https://en.bitcoin.it/wiki/Colored_Coins#Open_Assets). The encoding is based on LEB128.

OP_RETURN has 40 byte limit. There is a request to increase the size limit to 80 bytes.

"Previously, a single transaction could send assets to up to 34 distinct recipients. After the change, it will be able to send assets to up to 74 recipients". (see http://blog.coinprism.com/2015/02/11/80-bytes-op-return/)

Is the limit of 34 distinct recipient because the header of Open Asset is 6 bytes, so 40-6 = 34 ?

10  Bitcoin / Development & Technical Discussion / Must all nodes run Bitcoin core on: March 29, 2018, 10:55:14 AM
i have a simple question.

Bitcoin core is a reference implementation of bitcoin. Can we run other implementation of bitcoin , such as in Python, Java, or Ruby , as bitcoin node on mainnet ?

I suppose we can.
11  Alternate cryptocurrencies / Altcoin Discussion / Smart contract with Ethereum ERC20 token on: March 25, 2018, 06:52:50 AM
I often receive kind support from this forum.

In return, I write a simple tutorial on Smart contract with Ethereum ERC20 token. Please take a look and if there is any mistakes in it, you are welcome to criticize.

http://embedded-design-vic.blogspot.com/2018/03/smart-contract-with-ethereum-erc20-token.html
12  Alternate cryptocurrencies / Altcoin Discussion / ganache-cli module is not found on: March 14, 2018, 11:50:20 AM
I want to run a test program on ethereum code. i have installed ganache-cli. However, i could not run the test. The error is shown as below.

viiic@ubuntu:~/Downloads/project/inbox$ sudo npm install -g ganache-cli
npm WARN deprecated babel-preset-es2015@6.24.1: 🙌  Thanks for using Babel: we recommend using babel-preset-env now: please read babeljs.io/env to update!
npm WARN deprecated nomnom@1.8.1: Package no longer supported. Contact support@npmjs.com for more info.
/usr/bin/ganache-cli -> /usr/lib/node_modules/ganache-cli/build/cli.node.js
npm WARN webpack-cli@2.0.12 requires a peer of webpack@^4.0.0 but none is installed. You must install peer dependencies yourself.

+ ganache-cli@6.1.0
updated 2 packages in 10.897s

viiic@ubuntu:~/Downloads/project/inbox$ sudo npm run test

> inbox@1.0.0 test /home/vic/Downloads/project/inbox
> mocha

module.js:540
    throw err;
    ^

Error: Cannot find module 'ganache-cli'
    at Function.Module._resolveFilename (module.js:538:15)
    at Function.Module._load (module.js:468:25)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)
    at Object.<anonymous> (/home/vic/Downloads/project/inbox/test/Inbox.test.js:2:18)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Module.require (module.js:587:17)
    at require (internal/module.js:11:18)
    at /home/vic/Downloads/project/inbox/node_modules/mocha/lib/mocha.js:231:27
    at Array.forEach (<anonymous>)
    at Mocha.loadFiles (/home/vic/Downloads/project/inbox/node_modules/mocha/lib/mocha.js:228:14)
    at Mocha.run (/home/vic/Downloads/project/inbox/node_modules/mocha/lib/mocha.js:536:10)
    at Object.<anonymous> (/home/vic/Downloads/project/inbox/node_modules/mocha/bin/_mocha:582:18)
    at Module._compile (module.js:643:30)
    at Object.Module._extensions..js (module.js:654:10)
    at Module.load (module.js:556:32)
    at tryModuleLoad (module.js:499:12)
    at Function.Module._load (module.js:491:3)
    at Function.Module.runMain (module.js:684:10)
    at startup (bootstrap_node.js:187:16)
    at bootstrap_node.js:608:3
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! inbox@1.0.0 test: `mocha`
npm ERR! Exit status 1
13  Bitcoin / Development & Technical Discussion / connect two bitcoin core nodes on different machine, using regtest on: March 14, 2018, 09:20:06 AM
I have setup one bitcoin core node on machine A, and one bitcoin core node on machine B. The two machines can ping each other.

On machine A (10.0.0.11):
bitcoind -regtest -port=18332 -rpcport=8331
Bitcoin server starting

On machine B (11.0.0.12):
bitcoind -regtest -port=18332 -rpcport=8331 -connect=10.0.0.11:18332
Bitcoin server starting

Then on machine B, i run the command:
"bitcoin-cli -regtest  -port=18332 -rpcport=8331 getconnectioncount"

It returns 0. Is there any mistakes in my steps ?
14  Bitcoin / Development & Technical Discussion / get bitcoin address balance on: February 16, 2018, 02:13:36 PM
From bitcoin core:

ubuntu@ip-172-31-16-165:~/bitcoin/src$ ./bitcoin-cli  -testnet getaddressesbyaccount ""
[
  "2MxoU6Sz8gyWfLCF2b8a8Wv56VT1MHdSB2x",
  "2NEquFrdTthcctUv3tUkeNU7FbbkgMT2812"
]

Then, i go to https://blockchain.info/search?search=2NEquFrdTthcctUv3tUkeNU7FbbkgMT2812%22

The webpage told me unrecognized search pattern.

Is the bitcoin core address not recognised ?

I go to https://blockexplorer.com/

The webpage told me "no matching records found".

Which address format should i use
15  Bitcoin / Development & Technical Discussion / bitcoind mining in testnet on: February 16, 2018, 12:56:43 PM
I use bitcoin core version 0.16.0

Can i change my bitcoin.conf file, so that i can get bitcoins in testnet from mining?
16  Bitcoin / Development & Technical Discussion / Bitcoin core “bad-txns-in-belowout” on: January 13, 2018, 11:36:30 AM
When i want to send a raw transaction, i got the error of “bad-txns-in-belowout”.

Using decoderawtransaction, i got the txid of the only one vin, and the value of two vout are set at 0.015 BTC.
 
./bitcoin-cli -regtest decoderawtransaction "hexvalue"
{
  "txid": "35d2e765217d71db34fd0cd1cf52f419fc525069ac87ed9f413b194851c70849",
  "hash": "35d2e765217d71db34fd0cd1cf52f419fc525069ac87ed9f413b194851c70849",
  "version": 1,
  "size": 338,
  "vsize": 338,
  "locktime": 0,
  "vin": [
    {
      "txid": "2146415931a60db99ebf60849e2874dd67d37f870249a1ff06adcc6b8244155b",
      "vout": 0,
'''
    }
  "vout": [
    {
      "value": 0.01500000,
      "n": 0,
      "scriptPubKey": {
        "asm": "OP_DUP OP_HASH160 dd100be7d9aea5721158ebde6d6a1fd8fff93bb1 OP_EQUALVERIFY OP_CHECKSIG",
        "hex": "76a914dd100be7d9aea5721158ebde6d6a1fd8fff93bb188ac",
        "reqSigs": 1,
        "type": "pubkeyhash",
        "addresses": [
          "n1fprNxRhWrpkJ34A4cNsSZbHsnzhob2KL"
        ]
      }
    },
    {
      "value": 0.01500000,
      "n": 1,
...
    }
}

Using the command, i can see the amount and fee of vin.

./bitcoin-cli -regtest gettransaction 2146415931a60db99ebf60849e2874dd67d37f870249a1ff06adcc6b8244155b
{
  "amount": -0.08000000,
  "fee": -0.00100000,
  "confirmations": 0,
  "trusted": true,
  "txid": "2146415931a60db99ebf60849e2874dd67d37f870249a1ff06adcc6b8244155b",
...
}
   
Is there a command to check the output 0 value of txid 2146415931a60db99ebf60849e2874dd67d37f870249a1ff06adcc6b8244‌​155b ? It is the txid of vin.
17  Bitcoin / Development & Technical Discussion / Pay to Script Hash on: November 11, 2017, 08:06:27 AM
For P2SH, i understand it lets the sender funds a transaction using 20 byte hash. The script supplied to redeem must hash to the scriptHash.

scriptPubKey: OP_HASH160 <scriptHash> OP_EQUAL
scriptSig: 0 <sig1> ... <script> OP_m <pubKey1> ... OP_n OP_CHECKMULTISIG

For this example, the processing is:

The checking process:
Stack   Script   Description
Empty.0 <sig1> <sig2> OP_2 <pubKey1> <pubKey2> <pubKey3> OP_3 OP_CHECKMULTISIG OP_HASH160 <scriptHash> OP_EQUAL   locking script combined with redeem script
0 <sig1> <sig2> OP_2 <pubKey1> <pubKey2> <pubKey3> OP_3   OP_CHECKMULTISIG OP_HASH160 <scriptHash> OP_EQUAL   Constants are added to the stack.
trueOP_HASH160 <scriptHash> OP_EQUAL   Signatures validated in the order of the keys in the script.

what happens after OP_CHECKMULTISIG, what value does OP_HASH160 hash to?



18  Bitcoin / Development & Technical Discussion / Pay to public key hash on: November 10, 2017, 03:35:59 PM
In P2PKH, the public key

scriptPubKey: OP_DUP OP_HASH160 <pubKeyHash> OP_EQUALVERIFY OP_CHECKSIG
scriptSig: <sig> <pubKey>

is the public key of the sender? the hash is from the sender public key? the signature is of the sender?
19  Bitcoin / Development & Technical Discussion / main() in bitcoin-tx.cpp on: November 08, 2017, 01:58:01 PM
I notice that is a main() function in bitcoin-tx.cpp. This main() is not the main function of bitcoin core. Because the main function is in bitcoind.cpp

So why there is a main() in bitcoin-tx.cpp ?
20  Bitcoin / Bitcoin Discussion / Simple bitcoin core tutorial on: November 05, 2017, 07:58:28 AM
hello,

I have created a simple bitcoin blog.

https://embedded-design-vic.blogspot.com/

kindly criticise if you find any mistakes.

vic
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