Silent Payments: current states.

Here and there in various forum's boards one may come across posts relevant to Sileint Payments - technique which allow anyone to send BTC to user's unique static address, while each payment arrives at unique one-time address . Notably such techinique doesn't require direct preliminary communication between sender and receiver ^{as it was required by PayNyms, for example} as both parties independently derive the same one-time addresse using Elliptic Curve Diffie-Hellman algorithm.

The aim of this post is to ennumarate the full stack of silent payments as it stands today.

1) BIP352, the core protocol (ECDH, addresses, scanning, etc..) Authors: Josiah Baker, Ruben Somsen, Sebastian Falbesoner. BIP's status: version: 1.1.1, last commits: May 31, 2026

Some major points BIP352 specifies:

The ECDH-based key derivation for sender and receiver
The sp1… address encoding
The input eligibility rule)
The input_hash computation to prevent certain attacks
The scanning algorithm a receiver must run
Test vectors for implementation verification

2) BIP374, Discrete Log Equality Proofs (DLEQ). Authors: Andrew Toth, Ruben Somsen, Sebastian Falbesoner, BIP's status: Draft, last commits: Apr 28, 2026

Some major points BIP352 specifies:

Standard 64-byte zero-knowledge proof format proving that the same discrete logarithm relationship holds across two different elliptic curve bases, without revealing the private key
Tagged hashing scheme for the proof challenge to prevent cross-protocol reuse
GenerateProof algorithms
Test vectors for both proof generation and verification

3) BIP375, sending Silent Payments with PSBTs, Authors: Andrew Toth, Ruben Somsen, Sebastian Falbesoner, BIP's status: Draft, last commits: Apr 28, 2026

Some major points BIP375 specifies:

New PSBT output field PSBT_OUT_SP_V0_INFO carrying the recipient's scan and spend public keys before the output script is known
New global fields PSBT_GLOBAL_SP_ECDH_SHARE and PSBT_GLOBAL_SP_DLEQ for a single signer contributing one aggregate ECDH share with a BIP374 proof
New per-input fields PSBT_IN_SP_ECDH_SHARE and PSBT_IN_SP_DLEQ for the multi-signer case where each signer contributes a per-input share independently
Role definitions: how Constructors, Updaters, Signers, and Extractors each interact with these field
Defines ow the final PSBT_OUT_SCRIPT is computed from the collected ECDH shares once all signers have contributed]
Modification of PSBT_OUT_SCRIPT to be optional in silent-payment-capable PSBTs

4) BIP376 , spending Silent Payment Outputs with PSBTs. Authors: nymius (BDK contributor, pseudonymous), BIP's status: Draft, last commits: Apr 11, 2026

Some major points BIP376 specifies:

New PSBTv2 per-input fields carrying the tweak data needed to reconstruct the private key for a received silent payment output
Establishes how a signer uses the stored tweak to derive the correct signing key without re-scanning the blockchain

5) BIP392, Silent Payment Output Script Descriptors. Authors:Craig Raw , BIP's status: Draft, last commits: Mar 5, 2026

Some major points BIP392 specifies:

New sp(spscan_key, spspend_key) descriptor expressions for silent payment wallets
Optional wallet birthday argument to bound how far back a rescan needs to go
Optional labels argument specifying which label integers the wallet should scan for

As one may see, most of the Silent Payments stack is still in draft state. Probably due to this, wallets are not in a hurry to implement it. Sparrow is ahead of the curve, probably because it is descriptors-based wallet and its developer is author of the relevant part of the Silent Payments stack (BIP392).

P.S. This topic is too vast, so any help to refine it would be greatly appreciated.

References:

1) https://github.com/bitcoin/bips/blob/master/bip-0352.mediawiki
2) https://bips.xyz/352
3) https://github.com/bitcoin/bips/blob/master/bip-0374.mediawiki
4) https://bips.xyz/374
5) https://github.com/bitcoin/bips/blob/master/bip-0375.mediawiki
6) https://bips.xyz/375
7) https://github.com/bitcoin/bips/blob/master/bip-0376.mediawiki
8.) https://bips.xyz/376
9) https://github.com/bitcoin/bips/blob/master/bip-0392.mediawiki
10) https://bips.xyz/392
11) https://bennet.org/learn/silent-payments-bitcoin-privacy/
12) https://bitcoinindex.net/blog/bip392-silent-payment-descriptors-finalized-for-wallet-integ/
13) https://blog.bitbox.swiss/en/understanding-silent-payments-part-one/
14) https://blog.bitbox.swiss/en/understanding-silent-payments-part-two/