Quote from: achow101 on February 03, 2018, 05:29:59 AM

Quote from: nQuant on February 03, 2018, 04:04:19 AM

1. In second part of coinbase ckpool has extradata ckpool and signature /solo.ckpool.org/
hex : 0a 636b706f6f6c (this converts to ckpool) 11 2f736f6c6f2e636b706f6f6c2e6f72672f (this converts to /solo.ckpool.org/)

Q: ckpool is 6 bytes, why its length is set to 0a ?

These aren't actually length specifiers but rather just straight unicode text. The coinbase part of a coinbase transaction can contain basically anything it wants (except that it must begin with the block height and be less than 100 bytes) that does not have to conform to any particular serialization rules. So What this really represents is a newline (0a is newline) followed by ckpool and then another unicode separator and then /solo.ckpool.org/

Quote from: nQuant on February 03, 2018, 04:04:19 AM

2. If I want to generate all reward into single wallet address (cScriptPubKey), below pseudo code serialized as per protocol for coinbase 2 is correct ?
I think its should be either 0xffffffff or cCoinbaseValue (coinbasevalue is serialized value returned in getblocktemplate response)

var txOut = cExtraData + cSignature + "ffffffff" + cCoinbaseValue + cScriptPubKey + 0.ToString("x8") + cCommitment + cLockout;

No, this is incorrect. This contains more data than should be in a transaction output. What you have is some combination of the input data and the output data. This is actually the second half of the coinbase transaction which includes all of the outputs and part of the input data.

The only things in a transaction output are the value and scriptPubKey. So you should only have cCoinbaseValue and cScriptPubKey.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

0337a3954a (<= what value is this?)

This is actually two values.

The 03 specifies the number of outputs. There are 3 outputs. The rest of that is part of the value.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

00000000 (<= if above part is reward value, what is this ?)

This is part of the value. It should be combined with the last 4 bytes of the previous value as the full structure is a 64 bit integer. The full thing is 37a3954a00000000. This is the little endian encoding of the value (which is what Bitcoin uses). The value in decimal is 1251320631 satoshis.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

17a9144ab4b2aa35879fe47e6a16ea783494f9dcf615b78772ddc0 (I assume this is where the reward goes)

Only part of this is the output script. That is 17a9144ab4b2aa35879fe47e6a16ea783494f9dcf615b787. The 72ddc0 is part of the next thing.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

0000000000

This is the part of the last 3 bytes of the previous thing which is the value of the next output. The value of this is 72ddc00000000000 which is 12639602 satoshis.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

1976a914f4cbe6c6bb3a8535c963169c22963d3a20e7686988ac0 (and 0.5% fee goes here ?)

Only the 1976a914f4cbe6c6bb3a8535c963169c22963d3a20e7686988ac part is the scriptPubKey. This output is for the fee. The last 0 is part of the next thing.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

00000000000000

This (with the previous trailing 0) is the value of the last output, which is 0 satoshis (yes that is allowed). You are also missing a 0 which you have included as part of the next thing, but that is actually part of this one.

Quote from: nQuant on February 03, 2018, 04:04:19 AM

0266a24aa21a9ed99acb686178a3404d59c5f4521ccebf9cb523a337b0c05abc8d3ec375e39af7f 00000000 (this is witness provided in getbloctemplate with lock)

Excluding the first 0 and the last 4 zero bytes, this is the scriptPubKey of the last output. It is an OP_RETURN output that commits the witness hashes of the block.

The last 4 bytes are the lock time.

You are awesome. Thanks for taking time and explain each parts.

Coinbase1
----------------
Header               |   01000000010000000000000000000000000000000000000000000000000000000000000000fffff fff
Length               |   35 (<= this is 53 decimal length counts till signature part )
Height               |   0371bb07
Flag Length            |   00
Time with length         |   049dbc6f5a
Random with length         |   046fb28d21
Nonce Length            |   0c

Extra Nonce part
----------------
Nonce1               |   00000000
Nonce2               |   0000000000000000

Coinbase 2
----------------
Unicode Text            |   0a
Extra data               |   636b706f6f6c
Signature Length         |   11
Signature               |   2f736f6c6f2e636b706f6f6c2e6f72672f
                  |   ffffffff (<= is this separator between tx in and tx out ?)
Number of transactions      |   03
1251320631 satoshies      |   37a3954a00000000
Pub script key for reward     |   17a9144ab4b2aa35879fe47e6a16ea783494f9dcf615b787
12639602 satoshies         |   72ddc00000000000
Pub script key for fee        |   1976a914f4cbe6c6bb3a8535c963169c22963d3a20e7686988ac
0 reward               |   0000000000000000
Witness commitment         |   266a24aa21a9ed99acb686178a3404d59c5f4521ccebf9cb523a337b0c05abc8d3ec375e39af7f
end                 |   00000000