[QA] Can I use random number as `solution nonce`?

[qiji2023]

core/src/qubic.cpp

Line 1930 in 1d3dacd

const m256i& solution_nonce = *(m256i*)((unsigned char*)transaction + sizeof(Transaction));

here, Can I use random number as solution nonce?

[qiji2023]

and here

core/src/qubic.cpp

Line 2106 in 1d3dacd

const m256i & solution_nonce = *(m256i*)((unsigned char*)transaction + sizeof(Transaction));

[qiji2023]

@philippwerner Can you help me？

[philippwerner]

I assume you want to develop a miner? This is the reference code: https://github.com/qubic/Qiner/tree/2024-march
It is not just a random number that is sent. Please read this code. It sends the solution with a Message.
This code

core/src/qubic.cpp

Lines 2423 to 2477 in 1d3dacd

	int solutionIndexToPublish = -1;
	unsigned int j;
	for (j = 0; j < system.numberOfSolutions; j++)
	{
	if (solutionPublicationTicks[j] > 0
	&& system.solutions[j].computorPublicKey == computorPublicKeys[i])
	{
	if (solutionPublicationTicks[j] <= (int)system.tick)
	{
	solutionIndexToPublish = j;
	}
	break;
	}
	}
	if (j == system.numberOfSolutions)
	{
	for (j = 0; j < system.numberOfSolutions; j++)
	{
	if (!solutionPublicationTicks[j]
	&& system.solutions[j].computorPublicKey == computorPublicKeys[i])
	{
	solutionIndexToPublish = j;
	break;
	}
	}
	}
	if (solutionIndexToPublish >= 0)
	{
	struct
	{
	Transaction transaction;
	m256i nonce;
	unsigned char signature[SIGNATURE_SIZE];
	} payload;
	static_assert(sizeof(payload) == sizeof(Transaction) + 32 + SIGNATURE_SIZE, "Unexpected struct size!");
	payload.transaction.sourcePublicKey = computorPublicKeys[i];
	payload.transaction.destinationPublicKey = arbitratorPublicKey;
	payload.transaction.amount = 0;
	unsigned int random;
	_rdrand32_step(&random);
	solutionPublicationTicks[solutionIndexToPublish] = payload.transaction.tick = system.tick + MIN_MINING_SOLUTIONS_PUBLICATION_OFFSET + random % MIN_MINING_SOLUTIONS_PUBLICATION_OFFSET;
	payload.transaction.inputType = 0;
	payload.transaction.inputSize = sizeof(payload.nonce);
	payload.nonce = system.solutions[solutionIndexToPublish].nonce;
	unsigned char digest[32];
	KangarooTwelve(&payload.transaction, sizeof(payload.transaction) + sizeof(payload.nonce), digest, sizeof(digest));
	sign(computorSubseeds[i].m256i_u8, computorPublicKeys[i].m256i_u8, digest, payload.signature);
	enqueueResponse(NULL, sizeof(payload), BROADCAST_TRANSACTION, 0, &payload);
	}

creates a Transaction containing the solution.

[J0ET0M]

Issue seems to be resolved. i will close it for now.