Topic: Where is the limit check ? [ANSWERED, VERIFIED] (Read 1182 times)

Mike Hearn

legendary

Activity: 1526

Merit: 1134

See line 1421 of main.cpp in CBlock::ConnectBlock

Code:

if (vtx[0].GetValueOut() > GetBlockValue(pindex->nHeight, nFees))
return false;

GetBlockValue is defined as

Code:

int64 GetBlockValue(int nHeight, int64 nFees)
{
int64 nSubsidy = 50 * COIN;

// Subsidy is cut in half every 4 years
nSubsidy >>= (nHeight / 210000);

return nSubsidy + nFees;
}

ArsenShnurkov

legendary

Activity: 1386

Merit: 1000

I am looking into CTransaction::CheckTransaction function and doesn't see the check for transaction inputs.

Testing scenario:
1) Malicious node generates and signs the block after MAX_MONEY coins was generated,
2) Malicious node includes new transaction for money generation in that block.

3) Why a correct node will not accept new coins ?

This transaction will be checked with code:

if (IsCoinBase())
   {
   if (vin[0].scriptSig.size() < 2 || vin[0].scriptSig.size() > 100)
   return error("CTransaction::CheckTransaction() : coinbase script size");
   }

And this code doesn't check total amount of money

function
bool CBlock::CheckBlock() const
doesn't contain such checks either

Please explain, how the code prevents new coins after MAX_MONEY was generated.

UPD: Found similar topics:
https://bitcointalksearch.org/topic/how-do-clients-enforce-the-50-btc-generation-rule-681
https://bitcointalksearch.org/topic/questions-about-inflation-enforcement-2252
now I am checking them

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