Weekly Check-in: Week of 2026-05-18

[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, @spacebear21, @benalleng, @chavic, @zealsham, @Mshehu5

[payjoin-bot]

DanGould

@DanGould

Shipped

PRs reviewed:

• Expose InMemoryPersister in FFI
• Force linting scripts to align rust toolchain with latest nix shell and not latest nightly

Last Week

Review your previous thread: Last week's thread

[DanGould]

Shipped

Taxes. Oh boy.

Focus

Still ops. But also review where I can.

Bottleneck

Operations automation. Doing lots of things for the first time.

[payjoin-bot]

spacebear21

@spacebear21

Shipped

PRs merged:

• Patch payjoin git URL in JS wasm manifest

PRs reviewed:

• Add C# SDK to nix dev shell
• Remove sender sigs from receiver psbt_to_sign
• Enforce single-owner contract on InMemoryPersister
• Use orignal proposal mailbox id util method
• Test Nix dev shell setup
• Async Interface for Payjoin Receiver State Machine

Issues opened:

• Support C# build & test in nix

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Receiver fallback typestate

[spacebear21]

Focus

• Tidy up Receiver fallback typestate #1558 and review Sender Pending Fallback state #1557

Bottleneck

• Pulled in many different directions (bbm & other integrations, ffi api, rust api, reference implementation, mailroom, pr reviews) and struggling to prioritize/delegate appropriately.

[spacebear21]

• ship fallback reference impl
• handoff payjo.in by july

[payjoin-bot]

arminsabouri

@arminsabouri

Shipped

PRs merged:

• Use orignal proposal mailbox id util method
• Exclude opreturn from change heuristics

PRs reviewed:

• Remove sender sigs from receiver psbt_to_sign
• Correct FFI bindings monitor method name
• Patch payjoin git URL in JS wasm manifest
• Document ohttp relay best practice in payjoin lib
• refactor(cli): simplify bip cli args

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: WIP - dependency graph
• PR awaiting review: Sender cancel state
• PR awaiting review: WIP - Psbt scrubbing
• PR has requested changes: Add honest overview

[arminsabouri]

Focus:

• Psbt scrubbing multiparty-protocol-docs#9
• Sender Pending Fallback state #1557
  Note: refactored (previously called lattice psbt now concurrent psbt library will live here now https://github.com/payjoin/concurrent-psbt)
• Second question in General question on receiver's ProvisionalProposal and Monitor typestates #1548

Blockers:

• The concurrent psbt code is progressing but I am blocked on writing a POC. We gotta get the refactored code PR'd up and merged.

[payjoin-bot]

benalleng

@benalleng

Shipped

PRs merged:

• Force linting scripts to align rust toolchain with latest nix shell and not latest nightly

Last Week

Review your previous thread: Last week's thread

[benalleng]

Shipped

• Added the payjoin-cli <-> lianad integration test that the liana devs set as a requirement and tried to cleanup some stray change requests that su had for me. I reached out to pyth so hopefully he has some time to look over the PR as well this week.

Focus

What are you working on this week?

• more review cycles in the liana PR
• fixing some CI I am helping with in the cargo rbmt for rust-bitcoin
• More review

Bottleneck

Getting a good review cycle with some liana devs to get it across the finish line

[payjoin-bot]

chavic

@chavic

Shipped

No activity found.

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Register recursive type helpers
• PR awaiting review: Complete callback interface followups
• PR has requested changes: Add C# SDK to nix dev shell

[chavic]

Shipped:

Reviewed and merged contributor PRs in the BTCPay Payjoin plugin:

• External payer for run test payment flow. feat: use external payer for run test payment flow ValeraFinebits/btcpayserver-payjoin-plugin#16
• CI workflow with Rust toolchain. ci: Update CI workflow to include Rust toolchain ValeraFinebits/btcpayserver-payjoin-plugin#27
• Improve error handling. feat: improve error handling ValeraFinebits/btcpayserver-payjoin-plugin#20

PRs (BTCPay plugin, open):

• Handle initialized Payjoin poll timeouts quietly. Handle initialized Payjoin poll timeouts quietly ValeraFinebits/btcpayserver-payjoin-plugin#30
• Restart replay integration coverage. Add restart replay integration coverage ValeraFinebits/btcpayserver-payjoin-plugin#34
• Align plugin with renamed FFI bitcoin types and units. Align plugin with renamed FFI bitcoin types and units ValeraFinebits/btcpayserver-payjoin-plugin#32
• Remove template database scaffolding. Remove template database scaffolding ValeraFinebits/btcpayserver-payjoin-plugin#31
• Add release mode for FFI package generation. Add release mode for FFI package generation ValeraFinebits/btcpayserver-payjoin-plugin#33

PRs (uniffi-dart, open):

• Complete callback interface follow-ups. Complete callback interface followups Uniffi-Dart/uniffi-dart#137
• Register recursive type helpers. Register recursive type helpers Uniffi-Dart/uniffi-dart#138
• Test Nix dev shell setup. Test Nix dev shell setup Uniffi-Dart/uniffi-dart#136

PRs (rust-payjoin, open):

• C# SDK in rust-payjoin nix dev shell. Add C# SDK to nix dev shell #1559

Focus:

• Clear the review queue, own batch after they leave draft state + incoming reviews.
• Reconcile the Receiver Checks need cleaning up #29 / Receive payjoin from bitcoind [alpha] #31 cleanup overlap. refactor: Add migrations project and refactor EF configs ValeraFinebits/btcpayserver-payjoin-plugin#29 Remove template database scaffolding ValeraFinebits/btcpayserver-payjoin-plugin#31
• Convert payjoin-cli E2E into default CI-covered sender/receiver loop.
• Compound-type coverage + CI for the callback path. Follow-up: finish callback compound-type coverage and CI integration Uniffi-Dart/uniffi-dart#118
• Pick up C# NuGet release readiness (Track release readiness for the real Payjoin C# NuGet package #1448).
• uniffi-dart repo audit and stale-issues cleanup.
• Demo video.

Blockers:

• A good number of last week's items were done, just waiting for reviews. Needed hack for the demo video
• Still defining the UX side of the payjoin in BTCPay

[payjoin-bot]

zealsham

@zealsham

Shipped

PRs reviewed:

• Document ohttp relay best practice in payjoin lib

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR has requested changes: OHTTP keys should be rotated

[zealsham]

Focus

• OHTTP keys should be rotated #1449
• payjoin-cli resume succeeds prematurely #1545 (still accessing solution)

Bottlenecks

• i have been using ISP internet (mtn) for a week now rather than starlink (waiting for replacement kit) and they seem to hate it when i visit github and some bitcoin related websites as it take forever to load . This is PITA for me and cant hit flow state

[payjoin-bot]

Mshehu5

@Mshehu5

Shipped

PRs reviewed:

• Exclude opreturn from change heuristics

Last Week

Review your previous thread: Last week's thread

[Mshehu5]

Shipped

#1514 updated PR to the new stateless approach

Focus

Doing analysis on current behaviour of the changes in the PR also make PR available for intial review this weeek and start addressing feedback

[payjoin-bot]

0xZaddyy

@0xZaddyy

Shipped

PRs reviewed:

• Exclude opreturn from change heuristics

Last Week

Review your previous thread: Last week's thread

[ValeraFinebits]

Shipped

PRs opened:

• feat: Persist bootstrap events ValeraFinebits/btcpayserver-payjoin-plugin#26
• ci: Update CI workflow to include Rust toolchain ValeraFinebits/btcpayserver-payjoin-plugin#27
• refactor: Add migrations project and refactor EF configs ValeraFinebits/btcpayserver-payjoin-plugin#29

Testing:

• Launched a public BTCPay Server on Testnet with the Payjoin plugin for future open beta testing.

Focus

• Continue working on the plugin.

[benalleng]

Coming from the Discord. #1446 and #1546 have been nominated for this Wednesday's mob programming session hosted by @xstoicunicornx

[caarloshenriq]

Shipped

PRs reviewed:

• Enforce single-owner contract on InMemoryPersister #1534

Focus

• Review PRs
• Finish no_std implementation

[xstoicunicornx]

/check-in

[payjoin-bot]

Shipped

PRs merged:

• Correct FFI bindings monitor method name
• Remove sender sigs from receiver psbt_to_sign

PRs reviewed:

• test(js): add smoke tests for web bindings

PRs updated:

• reimplemented Non-blocking Interface for Payjoin State Machine  #1446
• reimplemented Async Interface for Payjoin Receiver State Machine #1546

Focus

• attempt to test @ValeraFinebits 's btcpay server payjoin plugin in testnet3
• follow up on General question on receiver's ProvisionalProposal and Monitor typestates #1548
• review PRs

Bottleneck

I think #1544 is good to merge, but not sure what the protocol is around that.