Validate a job's result in a proxy pool

Question

I'm writing my own proxy pool implementation. I have problem with share verification.

I received a job from upsteam mining pool:

 job={ "blob": "0c0ccdb490f2053f393023bdc102f7bf4c63be5c64569dc0b57ab94e9881fd66157995b679adc700000000767cb11fc62b2bde9fb8eae21058d99ad317482bfdbcc1956d766888dd4d475709", "job_id": "333", "target": "dc460300", "seed_hash": "154eb7a21cd32a597f985644187297607bad491650091620550877239c4178e1", "next_seed_hash": "", "height": 2032062 }

Sent this work to the miner. And miner submitted work with following result:

share={ 'id': '1', 'job_id': '333', 'nonce': '38870000', 'result': 'f54a858a87f0f5bc9f3e75fba670a11cfdaf87b650d4189f50601597c8650200' }

I want verify if the solution is correct. I'm using python and pyrx. The steps that I take to complete the verification:

Insert share['nonce'] from miner into job['blob'] to 39...43 bytes:

0c0ccdb490f2053f393023bdc102f7bf4c63be5c64569dc0b57ab94e9881fd66157995b679adc7*00000000*767cb11fc62b2bde9fb8eae21058d99ad317482bfdbcc1956d766888dd4d475709

0c0ccdb490f2053f393023bdc102f7bf4c63be5c64569dc0b57ab94e9881fd66157995b679adc7*38870000*767cb11fc62b2bde9fb8eae21058d99ad317482bfdbcc1956d766888dd4d475709

Hash this blob:

In [24]: blob = '0c0ccdb490f2053f393023bdc102f7bf4c63be5c64569dc0b57ab94e9881fd66157995b679adc738870000767cb11fc62b2bde9fb8eae21058d99ad317482bfdbcc1956d766888dd4d475709' In [25]: hashing_blob = pyrx.get_rx_hash(blob, job['seed_hash'], job['height']).hex()

But I got unequal results with share['result']. I am sure that the answer is correct. The original pool accepted this work. Where am i wrong?

In [37]: hashing_blob == share['result'] Out[37]: False In [38]: hashing_blob Out[38]: '4fa368b991c8320c9c2ad1b80566f67439e789b329e0c33119b072aa7f2782e9' In [39]: share['result'] Out[39]: 'f54a858a87f0f5bc9f3e75fba670a11cfdaf87b650d4189f50601597c8650200'

jtgrassie · Accepted Answer · 2020-02-14 18:11:56Z

You are trying to hash a hex string not binary data.

Working example:

 import pyrx import binascii import struct def pack_nonce(blob, nonce): b = binascii.unhexlify(blob) bin = struct.pack('39B', *bytearray(b[:39])) bin += struct.pack('I', nonce) bin += struct.pack('{}B'.format(len(b)-43), *bytearray(b[43:])) return bin seed = binascii.unhexlify('154eb7a21cd32a597f985644187297607bad491650091620550877239c4178e1'); nonce = struct.unpack('I',binascii.unhexlify('38870000'))[0] blob = "0c0ccdb490f2053f393023bdc102f7bf4c63be5c64569dc0b57ab94e9881fd66157995b679adc700000000767cb11fc62b2bde9fb8eae21058d99ad317482bfdbcc1956d766888dd4d475709" bin = pack_nonce(blob, nonce) height = 2032062 hash = binascii.hexlify( pyrx.get_rx_hash(bin, seed, height) ) print(hash)

Which results in: f54a858a87f0f5bc9f3e75fba670a11cfdaf87b650d4189f50601597c8650200

In my code I should use hashing_blob = pyrx.get_rx_hash(bytes.fromhex(blob), bytes.fromhex(job['seed_hash']), job['height']).hex() instead of hashing_blob = pyrx.get_rx_hash(blob, job['seed_hash'], job['height']).hex(). Thank you! — Andrei
– Andrei, Commented Feb 15, 2020 at 17:56
Can I ask you another question? How to check if my miner solution f54a858a87f0f5bc9f3e75fba670a11cfdaf87b650d4189f50601597c8650200corresponds to job's target dc460300? — Andrei
– Andrei, Commented Feb 15, 2020 at 18:29
See this Q/A and / or this code (which I put together based on the sheer amount of questions like this). — jtgrassie
– jtgrassie, Commented Feb 15, 2020 at 18:35

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