Weekly Check-in: Week of 2026-06-15

[payjoin-bot]

Weekly standup — each contributor has a thread below with auto-gathered activity.

Reply to your thread by end-of-day Monday (your timezone). Copy the template below and fill it in:

### Shipped
<!-- Add anything the bot missed: design work, specs, conversations, off-GitHub contributions. Correct any mistakes. Skip if the bot covered everything. -->

### Focus
What are you working on this week?

### Bottleneck
What is the single biggest bottleneck in progress toward your greater goal?
Name your goal. Name the constraint. Name who or what can unblock it.

Participated: @DanGould, @benalleng, @chavic

[payjoin-bot]

DanGould

@DanGould

Shipped

PRs merged:

• Constrain bitcoind client API version

PRs reviewed:

• Bump actions/checkout from v4 to v6
• Make Cargo-minimal and Cargo-recent lockfiles follow expected convention
• Add tests to catch mutants
• Improve error when config file is missing
• Add publish --dry-run check in release issue
• Add issue open comment in contributing.md

Issues opened:

• Update payjoin-cli to bitcoind-async-client 0.14+

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Fix try_preserving_privacy returning Empty when candidates exist

[DanGould]

Focus

Eager to get review on

• Fix try_preserving_privacy returning Empty when candidates exist #1629

and make a significant dent into the payjoin-cli-1.0, and get @spacebear21 back up to speed.

Bottleneck

Response time between requesting a review and receiving response makes it difficult to sequence work and anticipate when tickets will move

[payjoin-bot]

spacebear21

@spacebear21

Shipped

No activity found.

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: chore: update Cargo lock files

[payjoin-bot]

benalleng

@benalleng

Shipped

PRs merged:

• Add issue open comment in contributing.md
• Add publish --dry-run check in release issue
• Improve error when config file is missing
• Document payjoin cli supported bitcoind versions
• Add choose_relay method in RelayManager
• Multiple test utils relays
• Make Cargo-minimal and Cargo-recent lockfiles follow expected convention

PRs reviewed:

• feat: port payjoin core to no_std
• Bump actions/checkout from v4 to v6
• refactor(cli): consolidate relay logic in RelayManager

Issues opened:

• CI will lose support for actions/checkout v4 via node.js 20 being deprecated
• Session ids should be something other than raw increments in payjoin-cli

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Downgrade transitive deps to match minimal direct deps
• PR awaiting review: Constrain toml dep to be consistent with other uniffi crates
• PR awaiting review: Use time-based uuid instead of raw increment for session ids

[benalleng]

Focus

• With some contention in Use time-based uuid instead of raw increment for session ids #1638 perhaps we should rethink Session ids should be something other than raw increments in payjoin-cli #1631 and maybe just make --role non-optional? or simply add a prefix to the sessionIds if they are sender or receivers and add a bit of complexity to the SessionId struct in a different dimension

Bottleneck

Put a lot of focus in the cli this week to push some deficiencies in the ohttp manager but as a result my focus on integrations etc fell behind a bit

[DanGould]

@Mshehu5, I think the relay manager issues solve the blockers on bitcoindevkit/bdk-cli#242 sufficiently for that work to resume. There's a reference for what to do now, right @benalleng ?

[Mshehu5]

Yeah, will update the PR

[payjoin-bot]

chavic

@chavic

Shipped

PRs reviewed:

• Constrain bitcoind client API version

Last Week

Review your previous thread: Last week's thread

[chavic]

Shipped

Merged BTCPay Payjoin plugin:

• Keep accounting bridge pending until reconciled payment settles. fix: keep accounting bridge pending until reconciled payment settles ValeraFinebits/btcpayserver-payjoin-plugin#54
• Tie receiver session expiry to the monitoring window and unify fee policy. Tie receiver session expiry to the monitoring window and unify fee policy ValeraFinebits/btcpayserver-payjoin-plugin#57
• Update plugin TODO progress markers. Update plugin TODO progress markers ValeraFinebits/btcpayserver-payjoin-plugin#56

Open PRs BTCPay Payjoin plugin:

• Check input/output ownership against the wallet and persist seen inputs. Check input/output ownership against the wallet and persist seen inputs ValeraFinebits/btcpayserver-payjoin-plugin#58
• Randomize receiver input selection and consolidate proposal signature stripping. Use rust-payjoin privacy-preserving receiver input selection ValeraFinebits/btcpayserver-payjoin-plugin#59

Reviews BTCPay Payjoin plugin:

• Reviewed Add Payjoin V2 overview page. feat: Add Payjoin V2 overview page ValeraFinebits/btcpayserver-payjoin-plugin#44
• Reviewed fix legacy sender compatibility and invoice accounting. fix: fix legacy sender compatibility and invoice accounting ValeraFinebits/btcpayserver-payjoin-plugin#45

Reviews rust-payjoin :

• Approved Constrain bitcoind client API version. Constrain bitcoind client API version #1636

Issues Filed:

• Derive the receiver fee cap from estimation and make it configurable. Derive the receiver fee cap from estimation and make it configurable ValeraFinebits/btcpayserver-payjoin-plugin#60

Demo videos done.

Focus

• Fix payjoin-ffi opaque InputPair gap.
• BTCPay Plugin — finish the correctness pass. PRs under review and other fixes pending.
  • Credit the observed on-chain settlement output value, not the expected invoice amount.
  • Pin the settlement amount from the proposal and validate against the invoice.
  • Make the settlement script crash-safe (derive from the committed PSBT on reconciliation).
  • Fee estimation from NBXplorer + per-store config. Derive the receiver fee cap from estimation and make it configurable ValeraFinebits/btcpayserver-payjoin-plugin#60
  • Decide + document the fallback-broadcast policy.
  • Sweep the lows items: OHTTP key TTL, event-log retention, reservation lifetime, change-address churn, non-segwit inputs.

Blockers

• More codebase discovery could uncover more issues

[payjoin-bot]

zealsham

@zealsham

Shipped

PRs reviewed:

• Use time-based uuid instead of raw increment for session ids
• Improve error when config file is missing
• Add issue open comment in contributing.md

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR has requested changes: OHTTP keys should be rotated

[payjoin-bot]

Mshehu5

@Mshehu5

Shipped

No activity found.

Last Week

Review your previous thread: Last week's thread

[Mshehu5]

Shipped:
Updated #1514 and resolved alot of merge conflicts.

Focus :
working on #1514 smaller PR's

Bottleneck:
I have been in Kenya for BTC++ Open Source Edition and have had a busy schedule moving between events along with some long flights. I am also currently dealing with hotel Wi-Fi issues on my laptop which has slowed things down a bit

[payjoin-bot]

0xZaddyy

@0xZaddyy

Shipped

No activity found.

Last Week

Review your previous thread: Last week's thread

[0xZaddyy]

Shipped

• got append-only mailbox to support multiparty work to a good state

Focus:

• Currently in Nairobi for the Bitcoin++ conf, so this week is a bit slow, but I will continue working on the multiparty mailroom.

[ValeraFinebits]

Shipped

PRs reviewed:

• fix: keep accounting bridge pending until reconciled payment settles ValeraFinebits/btcpayserver-payjoin-plugin#54
• Update plugin TODO progress markers ValeraFinebits/btcpayserver-payjoin-plugin#56
• Tie receiver session expiry to the monitoring window and unify fee policy ValeraFinebits/btcpayserver-payjoin-plugin#57
• Check input/output ownership against the wallet and persist seen inputs ValeraFinebits/btcpayserver-payjoin-plugin#58
• Use rust-payjoin privacy-preserving receiver input selection ValeraFinebits/btcpayserver-payjoin-plugin#59

Issues opened:

• Align plugin v2 payjoin workflow with server v1 payjoin behavior ValeraFinebits/btcpayserver-payjoin-plugin#52
• Investigate flaky test from CI run ValeraFinebits/btcpayserver-payjoin-plugin#53
• Investigate flaky CI test ValeraFinebits/btcpayserver-payjoin-plugin#55

Testing:

• Testing the Payjoin plugin on a public BTCPay Server testnet instance.

Focus

• Continue working on the plugin.

[caarloshenriq]

/check-in

[payjoin-bot]

Shipped

PRs merged:

• Bump actions/checkout from v4 to v6

PRs reviewed:

• Delegate http tracing to tower middleware
• Dedup utxos locked method
• Add issue open comment in contributing.md

[caarloshenriq]

Focus:

• Review PRs

[vadim-anfv]

/check-in

[payjoin-bot]

Shipped

PRs merged:

• refactor(cli): consolidate relay logic in RelayManager

[xstoicunicornx]

/check-in

[payjoin-bot]

Shipped

PRs reviewed:

• Add issue open comment in contributing.md
• Document payjoin cli supported bitcoind versions
• Split resume session relays
• Add choose_relay method in RelayManager
• Multiple test utils relays

Auto-detected signals:

• PR has requested changes: Async Interface for Payjoin Receiver State Machine

[xstoicunicornx]

Focus

• Non-blocking Interface for Payjoin State Machine  #1446

Bottleneck

None