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This guide explains Bitcoin Core utxoupdatepsbt RPC in plain English. It shows what the command does, what its result means and what it cannot prove.
TL;DR
- What it is: Bitcoin Core 0.18.0 utxoupdatepsbt updated a base64 PSBT with witness UTXO records found in the node’s current UTXO set or mempool. It could not recover full previous transactions for non-witness inputs because the UTXO set stores outputs, not transaction history.
- Why it matters: utxoupdatepsbt is a narrow witness-UTXO enrichment tool. It improves signer context only when the node is trusted, chain state is recorded and legacy previous transactions are handled separately.
- Current position: Require a second reviewer and explicit rollback or expiry, and pause payments, signing or network-dependent services until post-change evidence is complete.
Bitcoin Core utxoupdatepsbt RPC in simple English
Bitcoin Core utxoupdatepsbt RPC: Legacy inputs require the full previous transaction so signers can defend against fee manipulation. The UTXO set cannot supply it, so get and authenticate it separately.
Simple example
A miner is checking Bitcoin Core utxoupdatepsbt RPC. Check script and value against the expected input. Record tip and mempool context because reorgs, conflicts and eviction can change availability.
Key terms in plain English
- BIP:
- Bitcoin Improvement Proposal: a document describing a proposed rule, standard or process. Its status must be checked separately.
- Bitcoin Core:
- Widely used software that validates Bitcoin and can provide wallet, network and operator tools.
- RPC:
- A command that software sends to a node to request information or a local action.
- Mempool:
- A node’s changing local collection of valid, unconfirmed transactions.
- UTXO:
- An unspent transaction output: a piece of bitcoin that can be used as an input to a later transaction.
Exact PSBT
Hash and decode the original, preserving its unsigned transaction. Updating must not alter inputs, outputs, sequences, locktime or existing approved metadata.
Lookup sources
The node searches active-chain UTXOs and mempool outputs. Record tip and mempool context because reorgs, conflicts and eviction can change availability.
Witness enrichment
For SegWit inputs, the previous output amount and script can be stored as witness_utxo, providing the data needed for signature hashing.
Non-witness limit
Legacy inputs require the full previous transaction so signers can defend against fee manipulation. The UTXO set cannot supply it, so get and authenticate it separately.
No ownership claim
A found UTXO proves node-visible output state, not wallet ownership, commercial intent or authority to sign. Check script and value against the expected input.
Privacy
Submitting a PSBT reveals the intended input set to the node. Use a controlled trusted node and prevent base64 artefacts or decoded values entering general logs.
How specialists test it
Operators test the command on a non-production node first. They check a normal reply, an invalid request, a timeout and a restart. This shows what the response means and prevents one local result from being mistaken for a network-wide outcome.
Frequently asked questions
What is the main point of Bitcoin Core utxoupdatepsbt RPC?
Bitcoin Core utxoupdatepsbt RPC: Legacy inputs require the full previous transaction so signers can defend against fee manipulation.
For Bitcoin Core utxoupdatepsbt RPC, what should a beginner know about exact PSBT?
Hash and decode the original, preserving its unsigned transaction. Updating must not alter inputs, outputs, sequences, locktime or existing approved metadata.
For Bitcoin Core utxoupdatepsbt RPC, what should a beginner know about lookup sources?
The node searches active-chain UTXOs and mempool outputs. Record tip and mempool context because reorgs, conflicts and eviction can change availability.
For Bitcoin Core utxoupdatepsbt RPC, what should a beginner know about witness enrichment?
For SegWit inputs, the previous output amount and script can be stored as witness_utxo, providing the data needed for signature hashing.
Conclusion
utxoupdatepsbt is a narrow witness-UTXO enrichment tool. It improves signer context only when the node is trusted, chain state is recorded and legacy previous transactions are handled separately.
Primary sources
Check the current specification status and the documentation for the exact implementation you operate before moving production funds or changing a mining node.
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