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New "Halfway RingCT" outputs for coinbase transactions

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When RingCT is enabled, outputs from coinbase transactions
are created as a single output, and stored as RingCT output,
with a fake mask. Their amount is not hidden on the blockchain
itself, but they are then able to be used as fake inputs in
a RingCT ring. Since the output amounts are hidden, their
"dustiness" is not an obstacle anymore to mixing, and this
makes the coinbase transactions a lot smaller, as well as
helping the TXO set to grow more slowly.

Also add a new "Null" type of rct signature, which decreases
the size required when no signatures are to be stored, as
in a coinbase tx.
This commit is contained in:
moneromooo-monero 2016-08-12 18:45:07 +01:00
parent 6f526cdff8
commit c3b3260ae5
No known key found for this signature in database
GPG key ID: 686F07454D6CEFC3
19 changed files with 120 additions and 36 deletions
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19
src/blockchain_db/blockchain_db.cpp
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@ -46,6 +46,7 @@ void BlockchainDB::pop_block()
void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transaction& tx, const crypto::hash* tx_hash_ptr)
{
bool miner_tx = false;
crypto::hash tx_hash;
if (!tx_hash_ptr)
{
@ -67,6 +68,7 @@ void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transacti
else if (tx_input.type() == typeid(txin_gen))
{
/* nothing to do here */
miner_tx = true;
}
else
{
@ -90,8 +92,21 @@ void BlockchainDB::add_transaction(const crypto::hash& blk_hash, const transacti
// we need the index
for (uint64_t i = 0; i < tx.vout.size(); ++i)
{
amount_output_indices.push_back(add_output(tx_hash, tx.vout[i], i, tx.unlock_time,
tx.version > 1 ? &tx.rct_signatures.outPk[i].mask : NULL));
// miner v2 txes have their coinbase output in one single out to save space,
// and we store them as rct outputs with an identity mask
if (miner_tx && tx.version == 2)
{
cryptonote::tx_out vout = tx.vout[i];
rct::key commitment = rct::zeroCommit(vout.amount);
vout.amount = 0;
amount_output_indices.push_back(add_output(tx_hash, vout, i, tx.unlock_time,
&commitment));
}
else
{
amount_output_indices.push_back(add_output(tx_hash, tx.vout[i], i, tx.unlock_time,
tx.version > 1 ? &tx.rct_signatures.outPk[i].mask : NULL));
}
}
add_tx_amount_output_indices(tx_id, amount_output_indices);
}