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These values are both intended for the same thing. Their divergence
seems to be the result of an incomplete rename.
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Previously in COutput, effective_value was initialized as the absolute
value of the txout, and fee as 0. effective_value along with fee were
calculated outside of the COutput constructor and set after the
object had been initialized. These changes will allow either the fee
or the feerate to be passed in a COutput constructor. If either are
provided, fee and effective_value are calculated and set in the
constructor. As a result, AvailableCoins also needs to be passed the
feerate when utxos are being spent. When balance is calculated or the
coins are being listed and feerate is neither available nor required,
AvailableCoinsListUnspent is used instead, which runs AvailableCoins
while providing the default value for feerate. Unit tests for the
calculation of effective value have also been added.
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tx for better privacy
9053f64fcbd26d87c26ae6b982d17756a6ea0896 [doc] release notes for random change target (glozow)
46f2fed6c5e0fa623bfeabf61ba4811d5cf8f47c [wallet] remove MIN_CHANGE (glozow)
a44236addd01cff4e4d751e0f379d399fbfc8eae [wallet] randomly generate change targets (glozow)
1e52e6bd0a8888efb4ed247d74ec7ca9dfc2e002 refactor coin selection for parameterizable change target (glozow)
Pull request description:
Closes #24458 - the wallet always chooses 1 million sats as its change target, making it easier to fingerprint transactions created by the Core wallet. Instead of using a fixed value, choose one randomly each time (within a range). Using 50ksat (around $20) as the lower bound and `min(1 million sat, 2 * average payment value)` as the upper bound.
RFC: If the payment is <25ksat, this doesn't work, so we're using the range (payment amount, 50ksat) instead.
ACKs for top commit:
achow101:
ACK 9053f64fcbd26d87c26ae6b982d17756a6ea0896
Xekyo:
reACK 9053f64fcbd26d87c26ae6b982d17756a6ea0896
Tree-SHA512: 45ce5d064697065549473347648e29935733f3deffc71a6ab995449431f60302d1f9911a0994dfdb960b48c48b5d8859f168b396ff2a62db67d535a7db041d35
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If the wallet always chooses 1 million sats as its change target, it is
easier to fingerprint transactions created by the Core wallet.
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no behavior changes, since the target is always MIN_CHANGE
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Also, use {}-initialization
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049003fe68a4183f6f20da16f58f10079d1e02df coinselection: Remove COutput operators == and != (Andrew Chow)
f6c39c6adb6cbf9c87f04d3d667701905ef5c0a0 coinselection: Remove CInputCoin (Andrew Chow)
70f31f1a81710aa59e95770de9a84bf58cbce1e8 coinselection: Use COutput instead of CInputCoin (Andrew Chow)
14fbb57b79c664090f6a4e60d7bdfc9759ff4307 coinselection: Add effective value and fees to COutput (Andrew Chow)
f0821230b8de2eec21a869d1edf9e2b9f502de25 moveonly: move COutput to coinselection.h (Andrew Chow)
42e974e15c6deba1d9395a4da9341c9ebec6e8e5 wallet: Remove CWallet and CWalletTx from COutput's constructor (Andrew Chow)
14d04d5ad15ae56df56edee7ca9a202b52037889 wallet: Replace CWalletTx in COutput with COutPoint and CTxOut (Andrew Chow)
0ba4d1916e26e2a5d603edcdb7625463989d25b6 wallet: Provide input bytes to COutput (Andrew Chow)
d51f27d3bb0d6e3ca55bcd23ce53e4fe413a9360 wallet: Store whether a COutput is from the wallet (Andrew Chow)
b799814bbd53736b79495072f3c9e05989a465e8 wallet: Store tx time in COutput (Andrew Chow)
46022953ee2e8113167bafd1fd48a383a578b13c wallet: Remove use_max_sig default value (Andrew Chow)
10379f007fd2c18f4cd24d0a0783d6d929f45556 scripted-diff: Rename COutput member variables (Andrew Chow)
c7c64db41e1718584aa2f30ff27f60ab0966de62 wallet: cleanup COutput constructor (Andrew Chow)
Pull request description:
While working on coin selection code, it occurred to me that `CInputCoin` is really a subset of `COutput` and the conversion of a `COutput` to a `CInputCoin` does not appear to be all that useful. So this PR adds fields that are present in `CInputCoin` to `COutput` and replaces the usage of `CInputCoin` with `COutput`.
`COutput` is also moved to coinselection.h. As part of this move, the usage of `CWalletTx` is removed from `COutput`. It is instead replaced by storing a `COutPoint` and the `CTxOut` rather than the entire `CWalletTx` as coin selection does not really need the full `CWalletTx`. The `CWalletTx` was only used for figuring out whether the transaction containing the output was from the current wallet, and for the transaction's time. These are now parameters to `COutput`'s constructor.
ACKs for top commit:
ryanofsky:
Code review ACK 049003fe68a4183f6f20da16f58f10079d1e02df, just adding comments and removing == operators since last review
w0xlt:
reACK 049003f
Xekyo:
reACK 049003fe68a4183f6f20da16f58f10079d1e02df
Tree-SHA512: 048b4cd620a0415e1d9fe8597257ee4bc64656566e1d28a9bdd147d6d72dc87c3f34a3339fa9ab6acf42c388df7901fc4ee900ccaabc3de790ffad162b544c15
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These operators are used only by the tests in std::mismatch. As
std::mismatch can take a binary predicate, we can use a lambda that
achieves the same instead.
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It is no longer needed as everything it was doing is now done by COutput
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Also rename setPresetCoins to preset_coins
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
Commits of previous years:
* 2020: fa0074e2d82928016a43ca408717154a1c70a4db
* 2019: aaaaad6ac95b402fe18d019d67897ced6b316ee0
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Changes SelectCoinsSRD to return a SelectionResult.
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Returns a std::optional<SelectionResult> from KnapsackSolver instead of
using out parameters for the inputs set and selected value.
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Removes coins_out and value_ret has SelectCoinsBnB return a
std::optional<SelectionResult>
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Introduces a SelectionResult struct which contains the set of selected
inputs and the total transaction fee for the transaction. This will be
used by the various SelectCoins* functions. Additionally helpers are
provided to compute the total input value and result comparisons.
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9d0379cea6c164610d05287ae6dd4e66f35b92b3 consensus: use <cstdint> over <stdint.h> in amount.h (fanquake)
863e52fe63a67fa020fb1ef527b9095a35ab77a5 consensus: make COIN & MAX_MONEY constexpr (fanquake)
d09071da5bc997f2de1f55ca7a9babc3d7619329 [MOVEONLY] consensus: move amount.h into consensus (fanquake)
Pull request description:
A first step (of a few) towards some source code reorganization, as well as making libbitcoinconsensus slightly more self contained.
Related to #15732.
ACKs for top commit:
MarcoFalke:
concept ACK 9d0379cea6c164610d05287ae6dd4e66f35b92b 🏝
Tree-SHA512: 97fc79262dcb8c00996852a288fee69ddf8398ae2c95700bba5b326f1f38ffcfaf8fa66e29d0cb446d9b3f4e608a96525fae0c2ad9cd531ad98ad2a4a687cd6a
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Move amount.h to consensus/amount.h.
Renames, adds missing and removes uneeded includes.
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selection algorithm
3633b667ffca5a715d9fb27e977515c1e24f600a Use SelectCoinsSRD if it has less waste (Andrew Chow)
8bf789b4b4b26082aea1d91c4d7aa8b01aedfdcf Add SelectCoinsSRD function (Andrew Chow)
2ad3b5d2ad03f781f564ee697ef11e18b2edcea3 tests: wallet_basic lock needed unspents (Andrew Chow)
b77885f13e480304085c654f1b948b20bba63452 tests: wallet_txn explicilty specify inputs (Andrew Chow)
59ba7d2861359f19fa740da9daad1a199409583f tests: rpc_fundrawtx better test for UTXO inclusion with include_unsafe (Andrew Chow)
a165bfbe44b4db3a40b8d1ba8095035367c932a7 tests: rpc_fundrawtx use specific inputs for unavailable change test (Andrew Chow)
df765a484d84702f066e127813fa45a7d440a957 tests: rpc_fundrawtx lock to UTXO types (Andrew Chow)
Pull request description:
To ease in the use of SRD as our fallback mechanism, this PR adds it as a secondary fallback algorithm in addition to the knapsack solver. Since #22009, the solution with the least waste will be chosen. This pattern is continued with SRD simply being another solution whose waste is compared.
ACKs for top commit:
glozow:
reACK 3633b66 via `git range-diff 981b9d1...3633b66`, thanks for taking the suggestions
laanwj:
Concept and code review ACK 3633b667ffca5a715d9fb27e977515c1e24f600a
Tree-SHA512: 895659f553fea2230990136565bdf18b1328de8b0ce47f06b64bb4d69301f6dd68cb38debe5c24fb6de1317b735fc020a987c541f00bbea65229de47e53adf92
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Instead of hijacking the effective_feerate to use the correct value
during coin selection, have OutputGroup be aware of whether we are
subtracting the fee from the outputs and provide the correct value to
use for selection.
To do this, OutputGroup now takes CoinSelectionParams and has a new
function GetSelectionAmount().
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The fees for transaction overhead and recipient outputs are now included
in nTargetValue instead of being a separate parameter. For the coin
selection algorithms, it doesn't matter that these are separate as in
either case, the algorithm needs to select enough to cover these fees.
Note that setting nValueToSelect is changed as it now includes
not_input_fees. Without the change to how nValueToSelect is increased
for KnapsackSolver, this would result in overpaying fees. The change to
increase by the difference between nFeeRet and not_input_fees allows
this to have the same behavior as previously.
Additionally, because we assume that KnapsackSolver will always find a
solution that requires change (we assume that BnB always finds a
non-change solution), we also include the fee for the change output in
KnapsackSolver's target. As part of this, we also use the changeless
nFeeRet when iterating for KnapsackSolver. This is because we include
the change fee when doing KnapsackSolver, so nFeeRet on further
iterations won't include the change fee.
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Allow RPC users to opt-in to unsafe inputs when funding a raw transaction.
Applications that need to manage a complex RBF flow (such as lightning
nodes using anchor outputs) are very limited if they can only use safe inputs.
Fixes #21299
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Co-authored-by: Xekyo <murch@murch.one>
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eligibility on grouping
5d4597666d589e39354e0d8dd5b2afbe1a5d7d8e Rewrite OutputGroups to be clearer and to use scriptPubKeys (Andrew Chow)
f6b305273910db0e46798d361413a7e878cb45f7 Explicitly filter out partial groups when we don't want them (Andrew Chow)
416d74fb1687ae1d47a58c153d09d9afe0b6dc60 Move OutputGroup positive only filtering into Insert (Andrew Chow)
d895e98b594b873f3d34c8ba63e9b55125d51b5a Move EligibleForSpending into GroupOutputs (Andrew Chow)
99b399aba5d27476b61b4865cc39553d03965d57 Move fee setting of OutputGroup to Insert (Andrew Chow)
6148a8acda5e594bb9b3b2d989056f9e03ddbdbd Move GroupOutputs into SelectCoinsMinConf (Andrew Chow)
2acad036575ec998f8bbe4f10f6206b1c8ad3d23 Remove OutputGroup non-default constructors (Andrew Chow)
Pull request description:
Even after #17458, we still deal with setting fees of an `OutputGroup` and filtering the `OutputGroup` outside of the struct. We currently make all of the `OutputGroup`s in `SelectCoins` and then copy and modify them within each `SelectCoinsMinConf` scenario. This PR changes this to constructing the `OutputGroup`s within the `SelectCoinsMinConf` so that the scenario can be taken into account during the group construction. Furthermore, setting of fees and filtering for effective value is moved into `OutputGroup::Insert` itself so that we don't add undesirable outputs to an `OutputGroup` rather than deleting them afterwards.
To facilitate fee calculation and effective value filtering during `OutputGroup::Insert`, `OutputGroup` now takes the feerates in its constructor and computes the fees and effective value for each output during `Insert`.
While removing `OutputGroup`s in accordance with the `CoinEligibilityFilter` still requires creating the `OutputGroup`s first, we can do that within the function that makes them - `GroupOutput`s.
ACKs for top commit:
Xekyo:
Code review ACK: https://github.com/bitcoin/bitcoin/pull/20040/commits/5d4597666d589e39354e0d8dd5b2afbe1a5d7d8e
fjahr:
Code review ACK 5d4597666d589e39354e0d8dd5b2afbe1a5d7d8e
meshcollider:
Light utACK 5d4597666d589e39354e0d8dd5b2afbe1a5d7d8e
Tree-SHA512: 35965b6d49a87f4ebb366ec4f00aafaaf78e9282481ae2c9682b515a3a9f2cbcd3cd6e202fee29489d48fe7f3a7cede4270796f5e72bbaff76da647138fb3059
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-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./
-END VERIFY SCRIPT-
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Instead of hacking OutputGroup::m_ancestors to discourage the inclusion
of partial groups via the eligibility filter, add a parameter to the
eligibility filter that indicates whether we want to include the group.
Then for those partial groups, don't return them in GroupOutputs if we
indicate they aren't desired.
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OutputGroup will handle the fee and effective value computations
inside of Insert. It now needs to take the effective feerate and long
term feerates as arguments to its constructor.
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Instead of having callers set the fees, effective values, and filtering
of outputs, do these within OutputGroups themselves as member functions.
m_fee and m_long_term_fee is added to OutputGroup to track the fees of
the OutputGroup.
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