Two recent papers quantified the real usage bias for the
real output in a ring being the true one, and shows that
the current biasing is much too weak.
While we wait for a better solution, we increase the ratio
of recent-to-total fake outputs, as well as decrease the
time window for recent outputs, so that half the fake outs
are selected within the last 1.8 day. Value plucked from
figure 10, page 11 of An Empirical Analysis of Linkability
in the Monero Blockchain, 2017, Miller et al.
This is also arbitrary, of course, but serves as a stopgap
till a better selection algorithm is chosen.
- Performance improvements
- Added `span` for zero-copy pointer+length arguments
- Added `std::ostream` overload for direct writing to output buffers
- Removal of unused `string_tools::buff_to_hex`
eb20f720 daemon: print average fee per byte in print_pool_stats (moneromooo-monero)
37be70bb daemon: add fee/byte when print pool transaction info (moneromooo-monero)
893f5a30 tx_pool: add blob size and fee/byte when logging a new tx (moneromooo-monero)
0ee018b4 wallet2: do not go over the target tx size if many destinations (moneromooo-monero)
9ae566d0 simplewallet: fix cold signing of split transactions (moneromooo-monero)
aae14a10 simplewallet: allow setting confirm-missing-payment-id in watch wallets (moneromooo-monero)
If using a large input and many destinations, the code would
generate as many outputs as it could using that input, even if
it would bring the resulting tx above the max tx size.
They'd be rejected as suspicious as the change goes to more
than one destination. However, split transactions will most
likely include fake zero amount change to random addresses,
so we only consider change with non zero amount for this.
Pass relevant information to the base class instead of overwriting
default values later, use objects instead of pointers to objects
to avoid having to new objects unnecessarily.
With the change from the original transfer method to the new
algorithm, payments to the same destination were merged. It
seemed like a good idea, optimizing space. However, it is a
useful tool for people who want to split large outputs into
several smaller ones (ie, service providers making frequent
payments, and who do not like a large chunk of their balance
being locked for 10 blocks after each payment).
Default to off, which is a change from the previous behavior.
When a single input is enough to satisfy a transfer, the code would
previously try to add a second input, to match the "canonical" makeup
of a transaction with two inputs and two outputs. This would cause
wallets to slowly merge outputs till all the monero ends up in a
single output, which causes trouble when making two transactions
one after the other, since change is locked for 10 blocks, and an
increasing portion of the remaining balance would end up locked on
each transaction.
There are two new settings (min-output-count and min-output-value)
which can control when to stop adding such unneeded second outputs.
The idea is that small "dust" outputs will still get added, but
larger ones will not.
Enable with, eg:
set min-output-count 10
set min-output-value 30
to avoid using an unneeded second output of 30 monero or more, if
there would be less than 10 such outputs left.
This does not invalidate any other reason why such outputs would
be used (ie, when they're really needed to satisfy a transfer, or
when randomly picked in the normal course of selection). This may
be improved in the future.
91d41090 tx_pool: ensure txes loaded from poolstate.bin have their txid cached (moneromooo-monero)
aaeb164c tx_pool: remove transactions if they're in the blockchain (moneromooo-monero)
558cfc31 core, wallet: faster tx pool scanning (moneromooo-monero)
f065234b core: cache tx and block hashes in the respective classes (moneromooo-monero)
The txid is not saved, and we want to make sure the transactions
have their txid cached while in the pool, since get_transactions
copies the transaction object, so any txid calculation on those
copies would not benefit any later caller, since the original tx
would be left without a cached txid.
New pull request because I couldn't figure out how to change the previous one.
1. For clarity, I want to focus the help text for the 'transfer' command on the most typical use case (a single payment).
2. New users will prefer to use 'transfer', so the older method 'transfer_original' should refer to 'transfer' rather than the other way around.
Asking for a full histogram from a remote node (since it's
untrusted) is pretty slow, and spams the remote node, so
we replace it by only adding a second input if we have rct
ones, which are for all intents and purposes always mixable.
