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Questions tagged [utxo]

Unspent transaction outputs are created by transactions and allow the owner of an associated address to spent a specific amount.

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How to create an application which constructs a transaction using `bcoin` (javascript)?

I am new to development. I am working on a project and I am trying to use bcoin. I want to create an application which has a UI, where the user will be asked to enter Destination address and amount. ...
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1answer
22 views

Question about UTXO and indivisibility

I'm reading about the concept of UTXO. Everywhere I read, it says that a UTXO in an account is indivisible. One analogy said: "It's as if you wanted to make a $5 purchase with a $10 bill. You wouldn't ...
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Are there any other balance management systems other than UTXOs and Account Based used by blockchains today?

To know how much balance a user has on the bitcoin blockchain you just need to look at their UTXOs. To do the same in Ethereum you just look at their accounts. Are there any other systems used by ...
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28 views

The risk of sending money to a xpub generated address

Suppose the owner of xpub share the xpub to others, and someone send some money to a xpub generated address. If the owner of xprv does not know the path used to generate that new address, is that ...
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1answer
21 views

How does an SPV client forms a transaction which is then Broadcasted?

As per my understanding, an SPV client only keeps a track of the block headers in its own database. So when a user tries to send bitcoins using that particular SPV client, how is the transaction ...
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2answers
36 views

Reference an UTXO of a transaction that has not been yet mined

How to reference an UTXO that has not been yet mined? I want to prepare a transaction and, before spreading it, use its UTXO as input for another relative timelocked transaction. Then, spread the ...
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1answer
40 views

How to find all UTXOs?

It is known, that UTXOs stored in chainstate database. But how to get them in simple txt view? Not ballances, but each UTXO.
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37 views

Is the bit encoding format for the graphic in BIP 68 implicitly little-endian?

CLTV (OP_CHECKLOCKTIMEVERIFY - absolute locktime) and CSV (OP_CHECKSEQUENCEVERIFY - relative locktime) utilize BIP 68. Is the locktime for those two operations implicitly encoded in little-endian ...
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121 views

Do UTXO's ever get consolidated to avoid complexitity?

In 'Mastering Bitcoin' (pg 130) it is explained that a transaction will require higher fees if it is complex. For example, if I collect bitcoin from 100 people to buy a single tent, then when those ...
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1answer
19 views

Can I receive detailed tx data via command line using only a lightclient?

I recently tried to sync the Bitcoin blockchain, but my laptop does not have enough space on it. I want to be able to analyze UTXOs and raw transaction data. Will a lightclient allow me to do this?
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55 views

What happens to a node if .bitcoin/chainstate is corrupted?

I tried to search for answers to my questions, but didn't find any, but please forgive me if this is a duplicate question. Suppose somehow .bitcoin/chainstate gets corrupted, e.g., a UTXO is deleted. ...
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Is there a UTXO for IOTA?

How does the cryptocurrency IOTA keep record of the spent coins? Is there something similar to the UTXO where the unspent coins were recorded? And it somebody wants to spend a coin, do you have to ...
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61 views

How to cheaply melt many micro UTXOs?

I know this was probably brought up before but I cannot find any good resources on some potential, at least theoretical way of achieving this. So basically I have a lot of UTXOs whose value is ...
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24 views

What would UTXO consolidation look like in the public ledger with Schnorr signatures?

I am excited about the privacy and optimisations involved with moving from ECDSA to Schnorr signatures. One of the privacy improvements, as I understand it, is that you can aggregate signatures so ...
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1answer
32 views

Which values are GetValueIn() and GetValueOut() calculate?

In Transaction.cpp, there is a function CAmount CTransaction::GetValueOut() const. In Coins.cpp, there is a function CAmount CCoinsViewCache::GetValueIn(const CTransaction& tx) const. My ...
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Does Elastico support transactions with multiple inputs?

Elastico: https://www.comp.nus.edu.sg/~loiluu/papers/elastico.pdf The paper mentioned a possible double spending checking logic in section 10.2. From what I understand, transactions are sharded into ...
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45 views

UTXO transaction consolidation?

As a relatively new user, I have only generated a handful of public addresses. Usually, to move to a newly discovered and preferred wallet. I’ve only recently learned that a single seed phrase can ...
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46 views

I seem to have too many unspent outputs for my given balance. What am I missing?

I have an address on the testnet. I started out with 1.3 btc. I then sent 0.5 btc to another address. My balance is now 0.8. OK, that makes sense. I expect now to have one UTXO which was the 0.8 in ...
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293 views

State of transaction and UTXO

What I have learned is that state is an abstract thing and is maintained by the node locally and the state of the current blockchain can be reached by starting all the way from the genesis block and ...
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2answers
78 views

If I reuse the same address can a previously used transaction be reused?

I was wondering, if I used an address adr0 to spend some coins in a transaction tx0 that give the coins to a different address adr1, and eventually, after some time, I receive some (completely ...
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Zcash T-address address wise UTXO transaction list both testnet and mainnet API [closed]

I need API for address wise UTXO transaction list for Zcash t-address for both testnet and mainnet.
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1answer
55 views

What does a bitcoin transaction contain?

I'm learning about basic transactions and know that a transaction should contain: i) Signature of the sender using some operator: sign(private key,message) ii) Receivers Public key (wallet address) ...
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1answer
30 views

How many change outputs are there in a Bitcoin transaction

I have been reading the following article: https://coinmetrics.io/difficulty-estimating-chain-transaction-volume/ It mainly discusses how unreliable transaction volume on a UTXO blockchain such as ...
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438 views

How does the wallet identify which UTXOs belong to a public address while creating a new transaction?

I am a beginner here. A Transaction output has a field for amount and a locking script but no direct field for public address for which the output is meant. When a new transaction is being created, ...
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1answer
263 views

Why does the order in which the transactions occur matter when we reconstruct ownership information?

I was wondering why the order in which the transactions occur matters when we reconstruct ownership information. Can't we just aggregate all the input and output for each account to calculate how much ...
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1answer
209 views

How can I get UTXO for a specific address?

Are there API's I can use to get this information?
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1answer
136 views

bitcoin chainstate database parsing in python giving wrong value

I am trying to decode chainstate db for a specific out index for a transaction in python just for learning. Transaction ID: 4d4a4c6ca4f3c91e69563199943336d3279fad71c9e8d9c1708ef9dc6ac16000 out index = ...
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1answer
48 views

Conflicting transaction info on Blockchain.info and Jaxx compared to other sources

I sent a batched transaction with 3 inputs pointing to the same output address. The receiver claims they only received 0.00042 BTC when they should have received a total of 0.00128615 BTC. She is ...
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1answer
241 views

utxo vs account-model [duplicate]

There are two possible models, the UTXO model and the account model. Each has advantages and disadvantages. Bitcoin chose the UTXO model. XRP and Ethereum for example use an account model. What are ...
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1answer
311 views

What are the standard formats of transaction outputs?

A transaction output can have the type Pay to public key hash, P2PKH, where the ScriptPubKey field has the format: 76 a9 14 <20-byte hash of pubkey> 88 ac Pay to script hash, P2SH, used for e.g. ...
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1answer
105 views

get the location of UTXO data

I need to find the location of the code which deals with UTXO, and then implement FIFO on UTXO storage. I aint able to find the location of UTXO code and also where it is stored.
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1answer
466 views

a few questions about how HD wallet works

I've read through HD wallet from various resources and have got the basic understanding about it, but am still confused by a few details 1) Each non-hardened public keys (thus addresses) can receive ...
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How was OP_return used to spend any utxo in 2010? [duplicate]

In the bitcoin wiki it says OP_RETURN is used to make utxos unspendable ,so how was it used to spend any utxo in 2010? Also how would a raw transaction like that look as well as the scriptsig of ...
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85 views

How are utxos associated with a particular address?

Is there a way to add or associate utxos with a particular address without creating a transaction?
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397 views

Rest API for address index

I'm looking for a rest api, preferably for a bitcoin core node. So I can get UTXOs per address. I've tried https://github.com/CounterpartyXCP/indexd-server but its pretty slow and crashes my node. ...
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1answer
83 views

Editing the utxo database?

Is it possible to manually add utxos to the utxo database? Could this be done by editing the chainstate file?
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1answer
42 views

Is it possible to spend the unspent outputs of a burn address?

If a burn address is created without a private key to prevent access to the bitcoin there, is not possible to create a transaction which would spend the utxos since there is no private key to sign the ...
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179 views

Pycoin: How to sign SegWit transaction via Pycoin?

My target is to make transaction with unspent transaction outputs(UTXOS). The information of UTXOs is as follow. [ { "pt_idx": 0, "subaccount": 37, "ga_asset_id": 1, "value": "...
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1answer
57 views

Is it true that only UTXOs can be used as Transaction Inputs?

I was reading this GitHub book on Bitcoin They state that "True or False: Only UTXOs can be used as inputs to transactions." Is the answer, True because you can only spend what you have. Or False, ...
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244 views

how can i query utxo to bitcoind(using bitcoin-cli) with public-private key not wallet

i want make a transaction to send bitcoin to others. so i need utxo by someones' adfress. but bitcoin-cli listunspent command only allows address in wallet. is it any idea to query listunspent with ...
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1answer
85 views

Do you 'own' Bitcoins purchased via an exchange?

I have been told by some that bitcoin exchanges do NOT record BTC transactions by a buyer/seller on the blockchain, but rather hold them in their own name and ledger - eg, if I buy one BTC via an ...
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1answer
116 views

Double spending UTXOs

I know that the inputs for a transaction(which is not coinbase) are UTXOs. Are UTXOs kept track of by some servers and also the owner's wallet? If there are servers which keep track of UTXOs, is it ...
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1answer
545 views

what happens to UTXOs when a transaction output script is satisfied?

As per my understanding from the book "Mastering bitcoin", a transaction output contains three things Amount - Bitcoin Value in Satoshis Locking-Script-Size - Locking-Script length in bytes, to ...
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1answer
707 views

How can you consolidate your personal UTXO set? (different wallet answers welcomed)

With network fees so low at the moment, I've seen a lot of recommendations to take the opportunity to move funds to segwit addresses and consolidate your UTXO set. During peak congestion, many smaller ...
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1answer
288 views

How can I get address wise UTXO balance for Zcash t-address

I tried to create user specific account wise zcash t-address, got the following error zcash-cli getnewaddress "testaccount" error code: -11 error message: Accounts are unsupported Is it possible to ...
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1answer
234 views

How to get unspents for inputs using bitcoinjs-lib?

I would like my simple wallet app to automatically select UTXOs for inputs. I realize that I can't accomplish this with just bitcoinjs, but is there something I can add to it to keep track of unspents?...
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1answer
59 views

What are the mechanics of verifying that an output transaction is not spent?

I am trying to understand the mechanics of how a bitcoin transaction works. When the output gets consumed by a later transaction, who and how prevents this output from being consumed a second time? Do ...
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1answer
56 views

BTC not received after sending

I have a transaction sent from Coinbase on 12 Dec 2017. i can see it on the blockchain, fees taken but the rest is unspent. How can I force the transaction to complete. Why didn't it complete ...
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1answer
801 views

Will all UTXOs eventually be worth 1 Satoshi?

If I want to spend 0.4BTC and I only have a UTXO for 1.0BTC, I will send 0.4BTC to the seller's address and 0.6BTC to my address. The seller has one UTXO and I have the other. One UTXO has become two....
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1answer
254 views

What is the Big-O complexity to retrieve the balance for a user?

Here is the Q/A related to: How is a wallet's balance computed?. Based on this: [Q] What is the Big-O complexity to retrieve the balance for a user? Is it O(n), so basically do I have to iterate ...