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SelectCoinsMinConf: Prefer coins with fewer ancestors
1 parent dc6dee4 commit 0b2294a

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6 files changed

+66
-43
lines changed

6 files changed

+66
-43
lines changed

‎src/bench/coin_selection.cpp‎

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -52,7 +52,7 @@ static void CoinSelection(benchmark::State& state)
5252

5353
set<pair<const CWalletTx*, unsigned int> > setCoinsRet;
5454
CAmount nValueRet;
55-
bool success = wallet.SelectCoinsMinConf(1003 * COIN, 1, 6, vCoins, setCoinsRet, nValueRet);
55+
bool success = wallet.SelectCoinsMinConf(1003 * COIN, 1, 6, 0, vCoins, setCoinsRet, nValueRet);
5656
assert(success);
5757
assert(nValueRet == 1003 * COIN);
5858
assert(setCoinsRet.size() == 2);

‎src/txmempool.cpp‎

Lines changed: 7 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1142,3 +1142,10 @@ void CTxMemPool::TrimToSize(size_t sizelimit, std::vector<uint256>* pvNoSpendsRe
11421142
if (maxFeeRateRemoved > CFeeRate(0))
11431143
LogPrint("mempool", "Removed %u txn, rolling minimum fee bumped to %s\n", nTxnRemoved, maxFeeRateRemoved.ToString());
11441144
}
1145+
1146+
bool CTxMemPool::TransactionWithinChainLimit(const uint256& txid, size_t chainLimit) const {
1147+
LOCK(cs);
1148+
if (exists(txid) && std::max(mapTx.find(txid)->GetCountWithAncestors(), mapTx.find(txid)->GetCountWithDescendants()) >= chainLimit)
1149+
return false;
1150+
return true;
1151+
}

‎src/txmempool.h‎

Lines changed: 3 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -605,6 +605,9 @@ class CTxMemPool
605605
/** Expire all transaction (and their dependencies) in the mempool older than time. Return the number of removed transactions. */
606606
int Expire(int64_t time);
607607

608+
/** Returns false if the transaction is in the mempool and not within the chain limit specified. */
609+
bool TransactionWithinChainLimit(const uint256& txid, size_t chainLimit) const;
610+
608611
unsigned long size()
609612
{
610613
LOCK(cs);

‎src/wallet/test/wallet_tests.cpp‎

Lines changed: 37 additions & 37 deletions
Original file line numberDiff line numberDiff line change
@@ -78,24 +78,24 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
7878
empty_wallet();
7979

8080
// with an empty wallet we can't even pay one cent
81-
BOOST_CHECK(!wallet.SelectCoinsMinConf( 1 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
81+
BOOST_CHECK(!wallet.SelectCoinsMinConf( 1 * CENT, 1, 6, 0, vCoins, setCoinsRet, nValueRet));
8282

8383
add_coin(1*CENT, 4); // add a new 1 cent coin
8484

8585
// with a new 1 cent coin, we still can't find a mature 1 cent
86-
BOOST_CHECK(!wallet.SelectCoinsMinConf( 1 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
86+
BOOST_CHECK(!wallet.SelectCoinsMinConf( 1 * CENT, 1, 6, 0, vCoins, setCoinsRet, nValueRet));
8787

8888
// but we can find a new 1 cent
89-
BOOST_CHECK( wallet.SelectCoinsMinConf( 1 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
89+
BOOST_CHECK( wallet.SelectCoinsMinConf( 1 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
9090
BOOST_CHECK_EQUAL(nValueRet, 1 * CENT);
9191

9292
add_coin(2*CENT); // add a mature 2 cent coin
9393

9494
// we can't make 3 cents of mature coins
95-
BOOST_CHECK(!wallet.SelectCoinsMinConf( 3 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
95+
BOOST_CHECK(!wallet.SelectCoinsMinConf( 3 * CENT, 1, 6, 0, vCoins, setCoinsRet, nValueRet));
9696

9797
// we can make 3 cents of new coins
98-
BOOST_CHECK( wallet.SelectCoinsMinConf( 3 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
98+
BOOST_CHECK( wallet.SelectCoinsMinConf( 3 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
9999
BOOST_CHECK_EQUAL(nValueRet, 3 * CENT);
100100

101101
add_coin(5*CENT); // add a mature 5 cent coin,
@@ -105,33 +105,33 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
105105
// now we have new: 1+10=11 (of which 10 was self-sent), and mature: 2+5+20=27. total = 38
106106

107107
// we can't make 38 cents only if we disallow new coins:
108-
BOOST_CHECK(!wallet.SelectCoinsMinConf(38 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
108+
BOOST_CHECK(!wallet.SelectCoinsMinConf(38 * CENT, 1, 6, 0, vCoins, setCoinsRet, nValueRet));
109109
// we can't even make 37 cents if we don't allow new coins even if they're from us
110-
BOOST_CHECK(!wallet.SelectCoinsMinConf(38 * CENT, 6, 6, vCoins, setCoinsRet, nValueRet));
110+
BOOST_CHECK(!wallet.SelectCoinsMinConf(38 * CENT, 6, 6, 0, vCoins, setCoinsRet, nValueRet));
111111
// but we can make 37 cents if we accept new coins from ourself
112-
BOOST_CHECK( wallet.SelectCoinsMinConf(37 * CENT, 1, 6, vCoins, setCoinsRet, nValueRet));
112+
BOOST_CHECK( wallet.SelectCoinsMinConf(37 * CENT, 1, 6, 0, vCoins, setCoinsRet, nValueRet));
113113
BOOST_CHECK_EQUAL(nValueRet, 37 * CENT);
114114
// and we can make 38 cents if we accept all new coins
115-
BOOST_CHECK( wallet.SelectCoinsMinConf(38 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
115+
BOOST_CHECK( wallet.SelectCoinsMinConf(38 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
116116
BOOST_CHECK_EQUAL(nValueRet, 38 * CENT);
117117

118118
// try making 34 cents from 1,2,5,10,20 - we can't do it exactly
119-
BOOST_CHECK( wallet.SelectCoinsMinConf(34 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
119+
BOOST_CHECK( wallet.SelectCoinsMinConf(34 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
120120
BOOST_CHECK_EQUAL(nValueRet, 35 * CENT); // but 35 cents is closest
121121
BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U); // the best should be 20+10+5. it's incredibly unlikely the 1 or 2 got included (but possible)
122122

123123
// when we try making 7 cents, the smaller coins (1,2,5) are enough. We should see just 2+5
124-
BOOST_CHECK( wallet.SelectCoinsMinConf( 7 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
124+
BOOST_CHECK( wallet.SelectCoinsMinConf( 7 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
125125
BOOST_CHECK_EQUAL(nValueRet, 7 * CENT);
126126
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);
127127

128128
// when we try making 8 cents, the smaller coins (1,2,5) are exactly enough.
129-
BOOST_CHECK( wallet.SelectCoinsMinConf( 8 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
129+
BOOST_CHECK( wallet.SelectCoinsMinConf( 8 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
130130
BOOST_CHECK(nValueRet == 8 * CENT);
131131
BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);
132132

133133
// when we try making 9 cents, no subset of smaller coins is enough, and we get the next bigger coin (10)
134-
BOOST_CHECK( wallet.SelectCoinsMinConf( 9 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
134+
BOOST_CHECK( wallet.SelectCoinsMinConf( 9 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
135135
BOOST_CHECK_EQUAL(nValueRet, 10 * CENT);
136136
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
137137

@@ -145,30 +145,30 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
145145
add_coin(30*CENT); // now we have 6+7+8+20+30 = 71 cents total
146146

147147
// check that we have 71 and not 72
148-
BOOST_CHECK( wallet.SelectCoinsMinConf(71 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
149-
BOOST_CHECK(!wallet.SelectCoinsMinConf(72 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
148+
BOOST_CHECK( wallet.SelectCoinsMinConf(71 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
149+
BOOST_CHECK(!wallet.SelectCoinsMinConf(72 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
150150

151151
// now try making 16 cents. the best smaller coins can do is 6+7+8 = 21; not as good at the next biggest coin, 20
152-
BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
152+
BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
153153
BOOST_CHECK_EQUAL(nValueRet, 20 * CENT); // we should get 20 in one coin
154154
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
155155

156156
add_coin( 5*CENT); // now we have 5+6+7+8+20+30 = 75 cents total
157157

158158
// now if we try making 16 cents again, the smaller coins can make 5+6+7 = 18 cents, better than the next biggest coin, 20
159-
BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
159+
BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
160160
BOOST_CHECK_EQUAL(nValueRet, 18 * CENT); // we should get 18 in 3 coins
161161
BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);
162162

163163
add_coin( 18*CENT); // now we have 5+6+7+8+18+20+30
164164

165165
// and now if we try making 16 cents again, the smaller coins can make 5+6+7 = 18 cents, the same as the next biggest coin, 18
166-
BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
166+
BOOST_CHECK( wallet.SelectCoinsMinConf(16 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
167167
BOOST_CHECK_EQUAL(nValueRet, 18 * CENT); // we should get 18 in 1 coin
168168
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U); // because in the event of a tie, the biggest coin wins
169169

170170
// now try making 11 cents. we should get 5+6
171-
BOOST_CHECK( wallet.SelectCoinsMinConf(11 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
171+
BOOST_CHECK( wallet.SelectCoinsMinConf(11 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
172172
BOOST_CHECK_EQUAL(nValueRet, 11 * CENT);
173173
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);
174174

@@ -177,11 +177,11 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
177177
add_coin( 2*COIN);
178178
add_coin( 3*COIN);
179179
add_coin( 4*COIN); // now we have 5+6+7+8+18+20+30+100+200+300+400 = 1094 cents
180-
BOOST_CHECK( wallet.SelectCoinsMinConf(95 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
180+
BOOST_CHECK( wallet.SelectCoinsMinConf(95 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
181181
BOOST_CHECK_EQUAL(nValueRet, 1 * COIN); // we should get 1 BTC in 1 coin
182182
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
183183

184-
BOOST_CHECK( wallet.SelectCoinsMinConf(195 * CENT, 1, 1, vCoins, setCoinsRet, nValueRet));
184+
BOOST_CHECK( wallet.SelectCoinsMinConf(195 * CENT, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
185185
BOOST_CHECK_EQUAL(nValueRet, 2 * COIN); // we should get 2 BTC in 1 coin
186186
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
187187

@@ -196,22 +196,22 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
196196

197197
// try making 1 * MIN_CHANGE from the 1.5 * MIN_CHANGE
198198
// we'll get change smaller than MIN_CHANGE whatever happens, so can expect MIN_CHANGE exactly
199-
BOOST_CHECK( wallet.SelectCoinsMinConf(MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
199+
BOOST_CHECK( wallet.SelectCoinsMinConf(MIN_CHANGE, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
200200
BOOST_CHECK_EQUAL(nValueRet, MIN_CHANGE);
201201

202202
// but if we add a bigger coin, small change is avoided
203203
add_coin(1111*MIN_CHANGE);
204204

205205
// try making 1 from 0.1 + 0.2 + 0.3 + 0.4 + 0.5 + 1111 = 1112.5
206-
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
206+
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
207207
BOOST_CHECK_EQUAL(nValueRet, 1 * MIN_CHANGE); // we should get the exact amount
208208

209209
// if we add more small coins:
210210
add_coin(MIN_CHANGE * 6 / 10);
211211
add_coin(MIN_CHANGE * 7 / 10);
212212

213213
// and try again to make 1.0 * MIN_CHANGE
214-
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
214+
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
215215
BOOST_CHECK_EQUAL(nValueRet, 1 * MIN_CHANGE); // we should get the exact amount
216216

217217
// run the 'mtgox' test (see http://blockexplorer.com/tx/29a3efd3ef04f9153d47a990bd7b048a4b2d213daaa5fb8ed670fb85f13bdbcf)
@@ -220,7 +220,7 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
220220
for (int j = 0; j < 20; j++)
221221
add_coin(50000 * COIN);
222222

223-
BOOST_CHECK( wallet.SelectCoinsMinConf(500000 * COIN, 1, 1, vCoins, setCoinsRet, nValueRet));
223+
BOOST_CHECK( wallet.SelectCoinsMinConf(500000 * COIN, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
224224
BOOST_CHECK_EQUAL(nValueRet, 500000 * COIN); // we should get the exact amount
225225
BOOST_CHECK_EQUAL(setCoinsRet.size(), 10U); // in ten coins
226226

@@ -233,7 +233,7 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
233233
add_coin(MIN_CHANGE * 6 / 10);
234234
add_coin(MIN_CHANGE * 7 / 10);
235235
add_coin(1111 * MIN_CHANGE);
236-
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
236+
BOOST_CHECK( wallet.SelectCoinsMinConf(1 * MIN_CHANGE, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
237237
BOOST_CHECK_EQUAL(nValueRet, 1111 * MIN_CHANGE); // we get the bigger coin
238238
BOOST_CHECK_EQUAL(setCoinsRet.size(), 1U);
239239

@@ -243,7 +243,7 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
243243
add_coin(MIN_CHANGE * 6 / 10);
244244
add_coin(MIN_CHANGE * 8 / 10);
245245
add_coin(1111 * MIN_CHANGE);
246-
BOOST_CHECK( wallet.SelectCoinsMinConf(MIN_CHANGE, 1, 1, vCoins, setCoinsRet, nValueRet));
246+
BOOST_CHECK( wallet.SelectCoinsMinConf(MIN_CHANGE, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
247247
BOOST_CHECK_EQUAL(nValueRet, MIN_CHANGE); // we should get the exact amount
248248
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U); // in two coins 0.4+0.6
249249

@@ -254,12 +254,12 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
254254
add_coin(MIN_CHANGE * 100);
255255

256256
// trying to make 100.01 from these three coins
257-
BOOST_CHECK(wallet.SelectCoinsMinConf(MIN_CHANGE * 10001 / 100, 1, 1, vCoins, setCoinsRet, nValueRet));
257+
BOOST_CHECK(wallet.SelectCoinsMinConf(MIN_CHANGE * 10001 / 100, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
258258
BOOST_CHECK_EQUAL(nValueRet, MIN_CHANGE * 10105 / 100); // we should get all coins
259259
BOOST_CHECK_EQUAL(setCoinsRet.size(), 3U);
260260

261261
// but if we try to make 99.9, we should take the bigger of the two small coins to avoid small change
262-
BOOST_CHECK(wallet.SelectCoinsMinConf(MIN_CHANGE * 9990 / 100, 1, 1, vCoins, setCoinsRet, nValueRet));
262+
BOOST_CHECK(wallet.SelectCoinsMinConf(MIN_CHANGE * 9990 / 100, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
263263
BOOST_CHECK_EQUAL(nValueRet, 101 * MIN_CHANGE);
264264
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);
265265

@@ -269,7 +269,7 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
269269
// Create 676 inputs (= (old MAX_STANDARD_TX_SIZE == 100000) / 148 bytes per input)
270270
for (uint16_t j = 0; j < 676; j++)
271271
add_coin(amt);
272-
BOOST_CHECK(wallet.SelectCoinsMinConf(2000, 1, 1, vCoins, setCoinsRet, nValueRet));
272+
BOOST_CHECK(wallet.SelectCoinsMinConf(2000, 1, 1, 0, vCoins, setCoinsRet, nValueRet));
273273
if (amt - 2000 < MIN_CHANGE) {
274274
// needs more than one input:
275275
uint16_t returnSize = std::ceil((2000.0 + MIN_CHANGE)/amt);
@@ -291,17 +291,17 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
291291

292292
// picking 50 from 100 coins doesn't depend on the shuffle,
293293
// but does depend on randomness in the stochastic approximation code
294-
BOOST_CHECK(wallet.SelectCoinsMinConf(50 * COIN, 1, 6, vCoins, setCoinsRet , nValueRet));
295-
BOOST_CHECK(wallet.SelectCoinsMinConf(50 * COIN, 1, 6, vCoins, setCoinsRet2, nValueRet));
294+
BOOST_CHECK(wallet.SelectCoinsMinConf(50 * COIN, 1, 6, 0, vCoins, setCoinsRet , nValueRet));
295+
BOOST_CHECK(wallet.SelectCoinsMinConf(50 * COIN, 1, 6, 0, vCoins, setCoinsRet2, nValueRet));
296296
BOOST_CHECK(!equal_sets(setCoinsRet, setCoinsRet2));
297297

298298
int fails = 0;
299299
for (int j = 0; j < RANDOM_REPEATS; j++)
300300
{
301301
// selecting 1 from 100 identical coins depends on the shuffle; this test will fail 1% of the time
302302
// run the test RANDOM_REPEATS times and only complain if all of them fail
303-
BOOST_CHECK(wallet.SelectCoinsMinConf(COIN, 1, 6, vCoins, setCoinsRet , nValueRet));
304-
BOOST_CHECK(wallet.SelectCoinsMinConf(COIN, 1, 6, vCoins, setCoinsRet2, nValueRet));
303+
BOOST_CHECK(wallet.SelectCoinsMinConf(COIN, 1, 6, 0, vCoins, setCoinsRet , nValueRet));
304+
BOOST_CHECK(wallet.SelectCoinsMinConf(COIN, 1, 6, 0, vCoins, setCoinsRet2, nValueRet));
305305
if (equal_sets(setCoinsRet, setCoinsRet2))
306306
fails++;
307307
}
@@ -321,8 +321,8 @@ BOOST_AUTO_TEST_CASE(coin_selection_tests)
321321
{
322322
// selecting 1 from 100 identical coins depends on the shuffle; this test will fail 1% of the time
323323
// run the test RANDOM_REPEATS times and only complain if all of them fail
324-
BOOST_CHECK(wallet.SelectCoinsMinConf(90*CENT, 1, 6, vCoins, setCoinsRet , nValueRet));
325-
BOOST_CHECK(wallet.SelectCoinsMinConf(90*CENT, 1, 6, vCoins, setCoinsRet2, nValueRet));
324+
BOOST_CHECK(wallet.SelectCoinsMinConf(90*CENT, 1, 6, 0, vCoins, setCoinsRet , nValueRet));
325+
BOOST_CHECK(wallet.SelectCoinsMinConf(90*CENT, 1, 6, 0, vCoins, setCoinsRet2, nValueRet));
326326
if (equal_sets(setCoinsRet, setCoinsRet2))
327327
fails++;
328328
}
@@ -346,7 +346,7 @@ BOOST_AUTO_TEST_CASE(ApproximateBestSubset)
346346
add_coin(1000 * COIN);
347347
add_coin(3 * COIN);
348348

349-
BOOST_CHECK(wallet.SelectCoinsMinConf(1003 * COIN, 1, 6, vCoins, setCoinsRet, nValueRet));
349+
BOOST_CHECK(wallet.SelectCoinsMinConf(1003 * COIN, 1, 6, 0, vCoins, setCoinsRet, nValueRet));
350350
BOOST_CHECK_EQUAL(nValueRet, 1003 * COIN);
351351
BOOST_CHECK_EQUAL(setCoinsRet.size(), 2U);
352352
}

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