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Bitcoin Core descriptorprocesspsbt RPC: Policy-Based Signing Guide
Bitcoin Core 26 descriptorprocesspsbt guide covering descriptor ranges, UTXO enrichment, signing, sighash, derivation privacy, finalisation and review.
This guide explains Bitcoin Core descriptorprocesspsbt 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 26.0 documents descriptorprocesspsbt for updating SegWit inputs in a PSBT from supplied output descriptors, the UTXO set or mempool, then signing inputs supported by those descriptors. It can optionally include derivation paths and finalise.
- Why it matters: descriptorprocesspsbt can bridge descriptor policy and PSBT signing without loading a wallet, but that flexibility raises the review burden. Completion must be followed by independent transaction-policy approval before broadcast.
- 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.
What this means in simple English
An RPC is a command sent to one Bitcoin Core node. It can ask that node for information or request a local action. A successful reply describes that node; it does not automatically prove what happened across the Bitcoin network.
Beginners can focus on the input, the result and the limit of that result. Operators should test the command on the exact Bitcoin Core version they run before relying on it.
Simple example
Think of a mempool as one node’s waiting room for valid transactions that have not yet entered a block. Different nodes can have different waiting rooms, and the contents can change from one second to the next.
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.
Inputs
Supply a Base64 PSBT and one or more descriptor strings or objects. Ranged descriptors default to 1000, so use bounded ranges based on known derivation evidence.
Enrichment
Core can add information from matching descriptors, the current UTXO set or mempool. Missing historical coins, wrong ranges or mismatched policies can leave inputs incomplete.
Signing boundary
Descriptors containing private material can sign matching inputs. Treat the RPC endpoint as a signer, restrict access and prevent secrets and PSBTs from entering logs.
Sighash
The default is DEFAULT for Taproot and ALL otherwise unless the PSBT specifies one. Only documented sighash strings are accepted; review their consequence before signing.
Privacy
bip32derivs defaults true and can expose key origins and paths. Disable it where downstream participants do not need derivation metadata.
Finalisation
finalize defaults true. The result returns PSBT, complete and optional hex when complete. Decode and independently review the final transaction before broadcast.
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 Bitcoin Core descriptorprocesspsbt RPC?
Bitcoin Core 26.0 documents descriptorprocesspsbt for updating SegWit inputs in a PSBT from supplied output descriptors, the UTXO set or mempool, then signing inputs supported by those descriptors. It can optionally include derivation paths and finalise.
Is Bitcoin Core descriptorprocesspsbt RPC active or supported today?
Require a second reviewer and explicit rollback or expiry, and pause payments, signing or network-dependent services until post-change evidence is complete.
Why does Bitcoin Core descriptorprocesspsbt RPC matter?
descriptorprocesspsbt can bridge descriptor policy and PSBT signing without loading a wallet, but that flexibility raises the review burden. Completion must be followed by independent transaction-policy approval before broadcast.
Do beginners need to use the technical details?
No. The command is mainly for people who operate Bitcoin Core or software connected to it. Other readers can use the article to understand what an operator or service is measuring.
Conclusion
descriptorprocesspsbt can bridge descriptor policy and PSBT signing without loading a wallet, but that flexibility raises the review burden. Completion must be followed by independent transaction-policy approval before broadcast.
Primary sources
- Bitcoin Core 26.0 descriptorprocesspsbt RPC
- BIP 174 Partially Signed Bitcoin Transactions
- Bitcoin Core 26.0 release notes
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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