30 What is an "unspent output"? 2012-07-29T13:24:38.293

26 How is a wallet's balance computed? 2014-03-03T21:01:12.803

22 How big is the UTXO database? 2015-02-10T16:54:41.210

12 Why does Bitcoin store all transaction inputs and outputs, instead of just an "account/balance" ledger? 2014-07-30T16:10:05.423

11 How many unspent transaction outputs are there? 2012-04-29T13:51:50.370

11 UTXO model vs. account/balance model 2016-11-25T03:33:24.020

10 Why do outputs need to be spent entirely? 2014-01-15T16:51:00.660

10 Where is the UTXO data stored? 2015-05-14T16:03:03.543

10 With 100% segwit transactions, what would be the max number of transaction confirmation possible on a block? 2017-09-11T03:40:29.743

8 What are the main technical hurdles to implementing UTXO commitments? 2015-09-05T00:39:19.277

8 Why is Bitcoin Core using LevelDB instead of Redis or SQLite? 2016-10-12T21:45:54.587

7 How do I uniquely identify a transaction (to protect against malleability)? 2015-05-27T14:52:36.260

7 Transaction with Multiple Inputs having Same Address 2016-06-15T05:02:50.490

6 Can the outputs of transactions with duplicate hashes be spent? 2013-07-05T17:49:49.730

6 How to find utxo? 2014-06-02T23:11:15.217

6 How is a Transaction Output Marked as Spent? 2014-06-30T15:22:08.590

6 How to index the UTXO set efficiently? 2014-10-08T23:11:47.770

6 Why must UTXO be completely consumed? 2015-06-24T21:44:01.970

6 What was the longest held UTXO ever spent? 2019-06-20T22:52:34.757

5 Do miners have to hold all the blocks in memory? 2013-05-21T19:10:57.077

5 BIP32 wallet sync with Bloom filters 2014-08-30T00:13:00.703

5 What technical properties does a confirmed Tx have that an unconfirmed Tx does not? 2016-01-15T21:49:32.217

5 Why does bitcoind use a fork of LevelDB for key-value storage? 2016-02-15T23:44:59.520

5 Where can I query the UTXO database? 2016-04-14T18:55:42.153

5 Is the UTXO set computed from scratch by new full nodes? 2016-11-02T15:39:30.733

5 How many UTXOs have a marginal fee cost that's higher than its worth? 2017-03-07T04:50:50.283

5 Will all UTXOs eventually be worth 1 Satoshi? 2018-01-10T03:55:27.897

5 What are the standard formats of transaction outputs? 2018-04-11T11:49:40.413

5 Do UTXO's ever get consolidated to avoid complexitity? 2018-12-15T15:38:20.030

4 Is it possible (in some way or other) to expire a txout? 2014-03-21T11:40:47.857

4 How can one realistically model the distribution of the network's unspent transaction outputs? 2014-10-03T09:44:40.563

4 How can I read chainstate database? 2014-10-06T14:51:21.197

4 Why does Bitcoin use the input/output system? 2015-08-20T23:18:31.700

4 How is it possible to say that a bitcoin was fully spent? 2016-01-28T17:11:17.023

4 Why has UTXO set stopped growing since 2017-06-03? 2017-07-11T10:56:32.457

4 What is the Big-O complexity to retrieve the balance for a user? 2018-01-03T16:52:52.533

4 a few questions about how HD wallet works 2018-04-03T01:04:29.570

4 Is the bit encoding format for the graphic in BIP 68 implicitly little-endian? 2019-01-08T18:30:19.977

4 How to find all UTXOs? 2019-01-10T04:18:28.877

4 Are all UTXOs locked by an address spent in a transaction? 2019-03-06T23:38:18.163

3 Why the "Unspent Transaction Output Set" is called "UTXO", not "UTOS"? 2014-03-06T04:31:40.730

3 Extracting information from utxo for offline processing 2014-06-03T21:04:16.740

3 What are the trade-offs between the different algorithms for deciding which UTXOs to spend? 2014-10-27T02:28:41.520

3 What's the maximum possible utxo growth rate now? Can that be turned into an attack? 2015-10-31T06:47:41.903

3 Why do we need CCoins in addition to CTransactions? 2016-02-02T09:29:31.037

3 Why is it not possible to replay transactions? 2016-07-30T07:24:41.880

3 How to check if an output has been spent? 2016-09-10T07:36:32.017

3 Do transactions with old UTXOs take longer to confirm? 2017-02-03T01:54:55.460

3 CVarint serialization format 2017-02-24T12:37:45.337

3 How is the UTXO database initialized? 2017-04-22T12:02:09.360

3 How to directly query leveldb database to get get a record by transaction hash or by sender's address? 2017-05-16T09:04:37.533

3 Can there be a half segwit, half normal Bitcoin transaction? 2017-07-20T16:21:07.010

3 Do all Tx's have UTXO? 2017-10-30T09:56:54.200

3 Why do we refer to previous transactions in each transaction? 2017-12-23T21:13:43.823

3 Do you 'own' Bitcoins purchased via an exchange? 2018-03-01T11:37:14.003

3 Why does the order in which the transactions occur matter when we reconstruct ownership information? 2018-05-28T10:53:21.263

3 How does the wallet identify which UTXOs belong to a public address while creating a new transaction? 2018-06-02T22:02:15.910

3 Do confidential transactions produce an UTXO 2018-12-05T16:04:24.650

3 How bitcoin nodes update UTXO set when their latests blocks are replaced? 2019-05-26T14:54:43.473

3 What are the downsides of integrating accumulators like utreexo to bitcoind? 2019-07-13T21:24:34.170

3 Fundamentals: Addresses don't hold coins, wallets do? 2019-10-02T07:45:11.030

2 Multiple Addresses in one UTXO 2014-09-09T15:21:25.720

2 How does serializing in coins.h work? 2014-10-15T14:03:35.507

2 Can the coinbase transaction be used to spend an UTXO? 2014-11-22T19:54:17.137

2 How is UTXO tracked? 2015-02-18T06:51:21.407

2 Why is utxo time a priority for miners? 2015-05-08T17:36:13.323

2 What are spent transactions? 2015-08-31T09:47:01.363

2 How can the transaction history be checked when new addresses are generated? 2015-12-23T16:02:21.583

2 Where can I see the code of how the UTXO set is updated in case of a fork in Bitcoin Core? 2016-01-26T15:26:23.647

2 How long is a Bitcoin? 2016-05-24T15:30:39.140

2 Is reliance on a UTXO Set provided by other users dangerous? 2016-06-14T22:36:51.020

2 How do you create a transaction from a UTXO in BitcoinJ? 2016-08-23T11:55:26.287

2 fetching unconfirmed utxos from blockchain.info 2016-08-28T19:38:01.313

2 Bug with bitcoinchain.com? 2016-10-01T17:30:51.673

2 How can a miner verify that a UTXOs is not spent elsewhere? 2017-03-24T09:02:38.673

2 How to work out the balance for an HD Wallet extended private key? 2017-04-06T15:59:46.647

2 How to Get UTXO using bitcore-lib? 2017-04-18T10:51:32.173

2 Parse UTXO of a transaction from chainstate 2017-05-11T18:51:03.293

2 What is the best way to download a "recent" UTXO set snapshot? 2017-05-28T05:53:35.050

2 Why do some transactions have more than one input? 2017-06-29T17:33:07.780

2 Why does unspent address index differ between APIs? 2017-10-12T18:54:01.943

2 Litecoin litecore-lib receive UTXO and current balance 2017-10-24T10:16:38.423

2 How does one reference an unspent transaction output? 2017-10-30T20:44:31.270

2 How to distribute UTXOs in hard fork while preserving privacy? 2017-11-01T05:41:44.007

2 How can you consolidate your personal UTXO set? (different wallet answers welcomed) 2018-01-29T22:13:38.137

2 If I reuse the same address can a previously used transaction be reused? 2018-07-17T09:22:50.850

2 State of transaction and UTXO 2018-07-17T23:23:50.840

2 Is there a UTXO for IOTA? 2018-10-23T16:58:08.287

2 What happens to a node if .bitcoin/chainstate is corrupted? 2018-11-09T03:36:16.453

2 How do blockchains in each nodes maintain consistency? 2019-05-16T16:04:30.993

2 Is it cryptographically possible to have aggregate signature schemes that can improve privacy in UTXO consolidation? 2019-06-01T11:05:59.760

2 How to prevent double spending Bitcoins? 2019-08-28T12:03:02.270

2 Other database besides UTXO? 2019-10-12T17:15:29.827

1 Where does Trezor get UTXOs from? 2014-01-16T19:40:37.373

1 How do miners/clients prove a transaction is valid? 2014-03-20T00:00:27.703

1 Determine which transaction spent a Transaction Output 2014-10-14T18:14:48.933

1 What is the easiest way to associate an utxo to a specific account? 2014-10-26T07:37:33.213

1 Using Transaction with multiple outputs 2015-02-18T09:23:54.743

1 Unable To Find Transaction Outpoint 2015-06-17T15:07:08.180