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BIP 375 Silent Payments with PSBTv2: Signing Workflow Guide

BIP 375 guide to Draft Silent Payment PSBTv2 fields, input finality, ECDH shares, DLEQ proofs, role responsibilities, change detection and validation.

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BIP 375 Sending Silent Payments with PSBTs guide cover

This guide explains BIP 375 Sending Silent Payments with PSBTs in plain English. It covers the problem behind the BIP, why it matters and whether the proposal is part of Bitcoin today.

TL;DR

  • What it is: BIP 375 is a Draft specification extending PSBT version 2 so multiple devices can construct Silent Payment outputs safely. Those scripts cannot be calculated until all eligible transaction inputs are known.
  • Why it matters: BIP 375 addresses the coordination gap between PSBTv2 and Silent Payments. Its safety comes from freezing transaction context, proving each ECDH contribution and verifying final output scripts before any signature or broadcast.
  • Current position: BIP 375 is a Draft specification extending PSBT version 2 so multiple devices can construct Silent Payment outputs safely.

BIP 375 Sending Silent Payments with PSBTs in simple English

BIP 375 Sending Silent Payments with PSBTs: BIP 375 is Draft, Specification, version 0.1.1 and requires BIPs 352, 370 and 374. Its fields are for PSBTv2, not PSBTv0.

Simple example

A node operator is checking BIP 375 Sending Silent Payments with PSBTs. Only after required shares and proofs validate may the output scripts be computed and the transaction extracted.

Key terms in plain English

BIP:
Bitcoin Improvement Proposal: a document describing a proposed rule, standard or process. Its status must be checked separately.
PSBT:
A portable format for passing an unsigned or partly signed Bitcoin transaction between tools and signers.
Node:
A computer running Bitcoin software that checks data and communicates with other peers.

Status and versions

BIP 375 is Draft, Specification, version 0.1.1 and requires BIPs 352, 370 and 374. Its fields are for PSBTv2, not PSBTv0.

Construction order

The constructor supplies Silent Payment recipients but output scripts remain unresolved until all inputs and their eligibility data are fixed.

Global share

A global field keyed by a 33-byte scan key carries the combined ECDH share for that recipient scan key.

BIP 375 Sending Silent Payments with PSBTs technical diagram
Global share: the fields, validation boundary and operational evidence that implementations need to agree.

Global proof

A matching global field carries the 64-byte BIP 374 proof for the ECDH share. Both fields must identify the same scan key and transaction context.

Signer work

Each signer determines eligible inputs it controls, computes its share and proof, verifies other contributions and refuses changed inputs, recipients or amounts.

Change detection

Roles must distinguish Silent Payment recipients from wallet change so output construction cannot redirect change or conceal a substituted recipient.

Extraction

Only after required shares and proofs validate may the output scripts be computed and the transaction extracted. Test missing, duplicated, inconsistent and stale fields. Build a revision-pinned evidence pack on an isolated node, wallet or protocol harness.

Frequently asked questions

What is the main point of BIP 375 Sending Silent Payments with PSBTs?

BIP 375 Sending Silent Payments with PSBTs: BIP 375 is Draft, Specification, version 0.1.1 and requires BIPs 352, 370 and 374.

For BIP 375 Sending Silent Payments with PSBTs, what should a beginner know about status and versions?

BIP 375 is Draft, Specification, version 0.1.1 and requires BIPs 352, 370 and 374.

For BIP 375 Sending Silent Payments with PSBTs, what should a beginner know about construction order?

The constructor supplies Silent Payment recipients but output scripts remain unresolved until all inputs and their eligibility data are fixed.

For BIP 375 Sending Silent Payments with PSBTs, what should a beginner know about global share?

A global field keyed by a 33-byte scan key carries the combined ECDH share for that recipient scan key.

Conclusion

BIP 375 addresses the coordination gap between PSBTv2 and Silent Payments. Its safety comes from freezing transaction context, proving each ECDH contribution and verifying final output scripts before any signature or broadcast.

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.

About the Author:

Darren Waggott is the visionary Founder and CEO of The Mining Shop UK, with over a decade of leadership in the cryptocurrency mining sector. Renowned for driving innovation, Darren has built a company dedicated to providing high-quality ASIC miners and comprehensive hosting services. His forward-thinking approach places The Mining Shop UK at the forefront of the industry.

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