Mining Theory – Are my block headers valid?

I need help verifying that the order of issues in block headers is correct for mining. I’m building my own miner as a challenge, but I’m still struggling with the proper format.

data sent to me solo.ckpool.org am:

"result":((("mining.notify","71ae8ae6")),"5324fa6e",8),"id":1,"error":null

"params":("64851638000ea04d","6a2be50e9bfb43f4973d1b2a84fc5fa27a11730b000209b00000000000000000","01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff3503a9d20c0004b8852666047a773e130c","0a636b706f6f6c112f736f6c6f2e636b706f6f6c2e6f72672fffffffff03c432eb1b000000001976a914c987a18977a2139835193b3df2eea097f834966888ac76dc91000000000016001451ed61d2f6aa260cc72cdf743e4e436a82c010270000000000000000266a24aa21a9ed5c2c1c347c20b2c0818daeda78f4d407f55b405e5652265bbc0b5ab948c615cb00000000",("3d14cb3882afe1cdb6121b77a1c6fe1ace1cfb4f56796875c0e5dc7475d794e5","90107e0ab73bfb0cb540cf129823a3fdd4d2df2d1cfb8a50f2ec4f10da6e4e3f","ce46e565beea4882ea532dfaecb83cc879a60c36a298ab40ec2a3c4e5ae42d65","afbead8f037a81818082f0d276e4a438a3456f0dfcce87255c349264a77ffdf1","67dcbd833c2676450e1f388da5781f902c6c4ca423a88fac6cf2a16827ebd567","7ffff8567be6efa8acd37a27b3c60bd194ca990bca74c9e71dd673d3e0c3f621","53514468979f077ace9ba497d3fa44e5091150188d29ed3dcb80a89f36662839","ff0c843842dde895d2ee8e698d35240517de66bdd839ec3f88d7c3a2b2337724","81a08847bb764ec45481a3e491640d5557fc78276091b69534af71267d1610a5","fb60c793ec790c71bb5b54e93cd8db5f134d9730754ec7c88f71862e07151d7f","bcd9c2f483e5a422e735f23610a40d07790f0ef47bea1218a4fbc1489865202c","b9a275e502fab0f76cb10e9d791a16ef18cf8addbf2ebdc92ede9a07a62dee84"),"20000000","17034219","662685b8",true),"id":null,"method":"mining.notify"

The output I generate is:

Coinbase1           : 01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff3503a9d20c0004b8852666047a773e130c
Coinbase2           : 0a636b706f6f6c112f736f6c6f2e636b706f6f6c2e6f72672fffffffff03c432eb1b000000001976a914c987a18977a2139835193b3df2eea097f834966888ac76dc91000000000016001451ed61d2f6aa260cc72cdf743e4e436a82c010270000000000000000266a24aa21a9ed5c2c1c347c20b2c0818daeda78f4d407f55b405e5652265bbc0b5ab948c615cb00000000
Extranonce1         : 5324fa6e
Extranonce2         : 000000008f6bc892
Extranonce2 size    : 8
Merkle 0            :3d14cb3882afe1cdb6121b77a1c6fe1ace1cfb4f56796875c0e5dc7475d794e5
Merkle 1            :90107e0ab73bfb0cb540cf129823a3fdd4d2df2d1cfb8a50f2ec4f10da6e4e3f
Merkle 2            :ce46e565beea4882ea532dfaecb83cc879a60c36a298ab40ec2a3c4e5ae42d65
Merkle 3            :afbead8f037a81818082f0d276e4a438a3456f0dfcce87255c349264a77ffdf1
Merkle 4            :67dcbd833c2676450e1f388da5781f902c6c4ca423a88fac6cf2a16827ebd567
Merkle 5            :7ffff8567be6efa8acd37a27b3c60bd194ca990bca74c9e71dd673d3e0c3f621
Merkle 6            :53514468979f077ace9ba497d3fa44e5091150188d29ed3dcb80a89f36662839
Merkle 7            :ff0c843842dde895d2ee8e698d35240517de66bdd839ec3f88d7c3a2b2337724
Merkle 8            :81a08847bb764ec45481a3e491640d5557fc78276091b69534af71267d1610a5
Merkle 9            :fb60c793ec790c71bb5b54e93cd8db5f134d9730754ec7c88f71862e07151d7f
Merkle 10            :bcd9c2f483e5a422e735f23610a40d07790f0ef47bea1218a4fbc1489865202c
Merkle 11            :b9a275e502fab0f76cb10e9d791a16ef18cf8addbf2ebdc92ede9a07a62dee84
Version             : 536870912 / 20000000
Merklehash          : bc65e13b5f7c69e9ce91adbb063d46b9be2445805e6a2498e13863708d57392c
ntime               : 662685b8 / 662685b8
nbits               : 17034219 / 17034219
Nonce               : 00
Block prevhash      : 6a2be50e9bfb43f4973d1b2a84fc5fa27a11730b000209b00000000000000000
Block Header        : 000000206a2be50e9bfb43f4973d1b2a84fc5fa27a11730b000209b000000000000000002c39578d706338e198246a5e804524beb9463d06bbad91cee9697c5f3be165bcb88526661942031700000000
Block hash(reversed): 03752b55669564dccb91e47cb1d5fe421fac014e1e9fb2d563d1bd8fe44c86f2
Target(reversed)    : 0000000000000000000000000000000000000000194203000000000000000000

The pool is sending the previous hash like this: 6a2be50e9bfb43f4973d1b2a84fc5fa27a11730b000209b00000000000000000 So some parts are already inverted (but nowhere does it say if they are inverted and can be used as is).

Here’s how to construct blocks:

Configuration (connection)

1. Do not revert versions in the pool. 20000000
2. Don’t invert the previous hash (compared to https://en.bitcoin.it/wiki/Block_hashing_algorithm it looks like it’s inverted). 6a2be50e9bfb43f4973d1b2a84fc5fa27a11730b000209b00000000000000000
3. Dash the merkle and flip it over.
4. Do not return ntime from the pool. 662685b8
5. Do not invert nbits in the pool. 17034219
6. Don’t generate a random nonce and revert it.

Add all as usual: version+prev_block_hash+merkle_hash+ntime+nbits+nonce For clarity: version+prev_block_hash+reverse(merkle_hash)+ntime+nbits+nonce

hashing

7. After calculating the target from nbits, we return it like this: 0000000000000000000000000000000000000000194203000000000000000000

8. After DHashing the header, return it as follows: 03752b55669564dccb91e47cb1d5fe421fac014e1e9fb2d563d1bd8fe44c86f2

compare

Perform a comparison between the hash and the target using:

int littleEndianCompare(const unsigned char *a, const unsigned char *b, size_t byte_len)

    for (size_t i = byte_len - 1; i < byte_len; --i)
    
        if (a(i) < b(i))
            return -1;
        else if (a(i) > b(i))
            return 1;
    
    return 0;
 

Thank you in advance!