Questions about Nu blockchain

Development
#1

To avoid topic drift I move the questions here

Is the “n” you refer to the “n:” in vout in the example below? I don’t see n=-1

{
    "txid" : "148dc9326bdb6b71a82a7fd6017e0b4c65c2a71a97c6fbf245776b0c865b3abe",
    "version" : 1,
    "time" : 1413510636,
    "locktime" : 0,
    "unit" : "B",
    "vin" : [
        {
            "txid" : "0000000000000000000000000000000000000000000000000000000000000000",
            "vout" : 4294967295,
            "scriptSig" : {
                "asm" : "",
                "hex" : ""
            },
            "sequence" : 4294967295
        }
    ],
    "vout" : [
        {
            "value" : 4040000.0,
            "n" : 0,
            "scriptPubKey" : {
                "asm" : "OP_HASH160 9328780d1dac8ea60169f0508b91ed0493ce732e OP_EQUAL",
                "hex" : "a9149328780d1dac8ea60169f0508b91ed0493ce732e87",
                "type" : "scripthash",
                "reqSigs" : 1,
                "addresses" : [
                    "BhCnQrYrA5LZm871dtMQEXeU93gmqbhdrC"
                ]
            }
        }
    ]
}
#2

Indeed. It’s because I didn’t see it’s named “vout” here instead of “n” and it’s displayed as an unsigned 32 bits integer: 2^32-1 = 4294967295.

#3

Thanks.

It seems that this case

and this case (bold face part)

cannot be distinguished by looking at vin or vout alone. One has to test (vout-vin) == 40 to make sure. Neither case satisfies the “one input and its hash is 0” criteria – they have no input hash. Only the grant tx has zero hash looking like “000…00”

#4

That’s how the raw data are, but getrawtransaction parses that in an attempt to make it more readable. When it’s a CoinBase getrawtransaction actually returns an object with a “coinbase” key in “vin”.

What do you want to know? Whether a transaction is a minting reward? If

  • there is at least one input
  • and the first input does not have a “coinbase” key
  • and the first output is empty (0 value and empty scriptPubKey)

Then it’s a PoS reward.

It’s here: https://bitbucket.org/JordanLeePeershares/nubit/src/cd6e9ee263579fc3e2cddd3cad1e6eef685112a5/src/main.h?at=master&fileviewer=file-view-default#main.h-701
And getrawtransaction uses this function to display the results: https://bitbucket.org/JordanLeePeershares/nubit/src/d7766481e780d413d5988d82489ee79efc365270/src/bitcoinrpc.cpp?at=2.0.3-Stable-Release&fileviewer=file-view-default#bitcoinrpc.cpp-247 (where you can see the CoinBase special case).

#5

To find a way to distinguish mintng reward and grant without calculating vin and vout, which is slow.

thanks.