For a few days I am attempting to jot down easy script in python to speak with stratum pool server. I am utilizing simplified code of NightMiner (https://github.com/ricmoo/nightminer/) and a few testnet I’ve foud ( stratum+tcp://pool.bitcoincloud.internet:4008), however I am unable to get the correct outcome. Possibly somebody extra skilled may assist me. Under I present every step of my script (step, no python supply code).
1. hook up with the server, authorize, get the job knowledge
After connecting to the server I ship this requests:
b'{"id": 1, "technique": "mining.subscribe", "params": []}n'
b'{"params": ["testuser", "anything"], "id": 2, "technique": "mining.authorize"}n'
and get the next response:
{"id":1,"outcome":[[["mining.set_difficulty","deadbeefcafebabea200000000000000"],["mining.notify","deadbeefcafebabea200000000000000"]],"40000004",4],"error":null}
{"id":null,"technique":"mining.set_difficulty","params":[0.01]}
{"id":null,"technique":"mining.notify","params":["4ca","4128bf630f57387b00e25b419d1bb77e667e4036a7d8fee80000015600000000","01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff2503a77614048c8a145e08","122f626974636f696e636c6f75642e6e65742f0000000002062c9c04000000001976a91423e020eacd64acfe093150331d44fdbcc0c7ce0688acc2eb0b00000000001976a91400bf6d61c2a34df5a9ea338fcad188c31bb4a52388ac00000000",[],"20000000","1a02b098","5e148a8c",true]}
2. get the coinbase and merkle root
With this knowledge and extranounce=”00000000″ I can construct the coinbase (in byte type, however I’ll present as hex on this instance):
coinbase=coinb1+extranounce1+extranounce2+coinb2
coinbase=b'01000000010000000000000000000000000000000000000000000000000000000000000000ffffffff2503a77614048c8a145e084000000400000000122f626974636f696e636c6f75642e6e65742f0000000002062c9c04000000001976a91423e020eacd64acfe093150331d44fdbcc0c7ce0688acc2eb0b00000000001976a91400bf6d61c2a34df5a9ea338fcad188c31bb4a52388ac00000000'
Subsequent factor to do is double hash the coinbase with SHA256 algo, which provides as the next bytes:
b'9b9c9ab0b1c92844e4fed3f895f9443fefcda5ae02cc5a8ad4444f9303081a23'
There isn’t any merkle branches (merkle branches array is empty), so hash above is our merkle root.
3. constructing the header
With merkle root and knowledge obtained in step 1, I can begin constructing a header:
header= model + prevhash + merkle root + ntime + nbits + nonce
I take advantage of the values as follows:
model - obtained '20000000', after little-endian conversion it's '00000020'
prevhash - obtained '4128bf630f57387b00e25b419d1bb77e667e4036a7d8fee80000015600000000', after conversion it's '63bf28417b38570f415be2007eb71b9d36407e66e8fed8a75601000000000000' (reverse bytes order each 4 bytes)
merkle root - get '9b9c9ab0b1c92844e4fed3f895f9443fefcda5ae02cc5a8ad4444f9303081a23' in step 2, stays that method
ntime - obtained '5e148a8c', after conversion it's '8c8a145e'
nbits - obtained '1a02b098', after conversion it's '98b0021a'
So the header is
b'0000002063bf28417b38570f415be2007eb71b9d36407e66e8fed8a756010000000000009b9c9ab0b1c92844e4fed3f895f9443fefcda5ae02cc5a8ad4444f9303081a238c8a145e98b0021a' + nonce
4. search nonce
the problem is 0.01, so my goal is
00000063ff9c0000000000000000000000000000000000000000000000000000
after some calculations, I discover this 4 bytes to make use of it as a nonce:
b'd0cf1040'
so my full header is now
b'0000002063bf28417b38570f415be2007eb71b9d36407e66e8fed8a756010000000000009b9c9ab0b1c92844e4fed3f895f9443fefcda5ae02cc5a8ad4444f9303081a238c8a145e98b0021ad0cf1040'
after double-hashing it with SHA256 algo and reverse bytes order I get this hash:
000000032f201567fc4d02fa468bf2dc6a5c21ae70098c124e99ee7d2520ca26
which is under my goal, so ‘d0cf1040’ must be the right nonce.
5. submit nounce
final thing to do is submitting the outcomes, so I ship this request to the server:
b'{"id":2, "technique":"mining.submit","params":["testuser","4ca","00000000","5e148a8c","d0cf1040"]}n'
and that is response I get:
{"id":2,"outcome":false,"error":null}
I do not know why I get outcome=false. I can solely suppose there’s a mistake in step 3 (constructing header) and this error is said to byte-order of some values, however I am unable to discover this error (I’ve tried many variants of byte-order, however by no means get the response outcome=true).
I will probably be a lot obliged if anybody can test this calculations and provides me some suggestions.
