Questions tagged [utxo]

Unspent Transaction Outputs (UTXOs) are created by transactions and allow the owner of an associated address to spend a specific amount.

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How to approach building a custom UTXO index on top of a full-node

I want to avoid physically importing addresses into a wallet. I want to write a UTXO indexing system on a per-address basis. I often wonder how a wallet can keep track of all of its addresses UTXOs, ...
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How to directly query leveldb database to get get a record by transaction hash or by sender's address?

I learned that the blocks and transactions are stored locally in .bitcoin/blocks/index and .bitcoin/chainstate databases, respectively. I want to make a direct query to those databases to measure the ...
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Is it cryptographically possible to have aggregate signature schemes that can improve privacy in UTXO consolidation?

My understanding of Schnorr signatures, Taproot and Graftroot and how they improve privacy in smart contracts / multi-sig is by allowing users to aggregate signatures so the individual signatures and ...
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201 views

How to create a transaction input from tx id of UTXO?

I'm in the midst of working this github --> https://github.com/karask/python-bitcoin-utils/blob/master/examples/spend_p2sh_transaction.py Sorry as I'm not that good in this. I would like to ask the ...
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How many TXO have been created in total?

I've seen some statistical data about the Bitcoin UTXO number (around 61M currently). I was wondering how many TXOs (including spent and unspent) there were in the complete history of Bitcoin?
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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
465 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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Create an issuance and a send within the same block (XCP)

Using counterparty api I am issuing an asset, signing the raw transaction and sending raw transaction. Api I used is http://counterparty.io/docs/api/#create_issuance As it takes 10 or more minutes to ...
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get utx scriptPubKey to become an object

I'm using this python script https://github.com/sebicas/bitcoin-sniffer When I see a utx I look at each output and find the scriptPubKey I expected to see something like "scriptPubKey": { "asm": ...
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663 views

Mempool tracking

I'm trying to clear up some uncertainties around the mempool A tx comes in, its validated, and no other transactions have currently marked any of its inputs. Tx gets added to mempool. If a double ...
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Had a question on using on-Chain Data(Glassnode) to measure Unrealised/Realised profit and loss of BTC holders - isn't on-chain data not complete?

https://twitter.com/Negentropic_/status/1408436526262988801 The link above shows this tweet and pic: Isn't on-chain data not the full universe of transactions? for eg. Example 1: we have 10 users ...
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Cannot unserialize chainstate transaction outputs after de-obfuscation

I was able to read chainstate database. Getting the key and de-obfuscating to get a valid last block. However, when it comes to transactions that follow after that, I cannot de-serialize them no ...
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Use wallet db for locked UTXOs in Bitcoin Core

Related question: Why are UTXO locks stored in memory only? Sorry this maybe a dumb question for people good with using database in C++ however I am not able to understand what exactly is going wrong ...
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Signing transaction for later use

If I have a segwit UTXO with for example 10 BTC , can I make some raw transactions ready to get broadcasted?
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Is there a way to know at any point in time T how many BTC exist that were bought at time t<T?

What I would like to find out is whether for a specific time in the past, we can know the number of BTC that exist today and were bought at this time. The discrete time can be the time of block ...
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if bitcoin miner(s) changed the UTXO set would the bitcoin nodes reject the blocks?

if so, would this cause a Fork? or what would happen?
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278 views

Privacy: How should I handle UTXO's?

We know that, for security and anonymity, we shouldn't reuse addresses. Also, there is the idea of change avoidance to protect ourselves from any number of change detection heuristics. But I find ...
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Uniquely identifying a UTXO

I see two ways: Txid + index Txid + script hash Pros of the txid + index: Simple and short Cons of txid + index: It relies on array iteration being deterministic and all third party services ...
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1answer
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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
45 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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318 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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2answers
501 views

How to get unspent bitcoins using bitcoinj

I'm trying to get unspent transaction using bitcoinj like here without using api calls. How can I do this?