Weekly Check-in: Week of 2026-06-08

[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, @zealsham, @Mshehu5, @0xZaddyy

[payjoin-bot]

DanGould

@DanGould

Shipped

PRs merged:

• Mailroom EMFILE resilience
• Stabilize 1.0 errors by carving out errors used in state machine control flow & keeping the rest opaque
• Rename EncapsulationError to DecapsulationError
• Document BIP77 v1 fallback behavior in create_post_request

PRs reviewed:

• Receiver fallback typestate
• Bump payjoin version to 1.0.0-rc.3
• Merge Cancel and Failure variants
• payjoin-cli WalletCreateFundedPSBTOptions accept Option

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Mailroom fd hygiene

[DanGould]

Shipped

• Helped Ben ship payjoin-1.0.0-rc.3
• Changed some settings on Payjoin mailroom @ payjo.in to fix immediate fire

Focus

• Mailroom fd hygiene #1610 Gotta get the real fire extinguisher for mailrooms and roll them out to operators, propose h2 multiplexing upgrade to fix the core of the problem
• Then onto at least recording what needs to be done for payjoin-cli-1.0 reference and codifying decisions in BIP 77 spec

Bottleneck

I need to spend the time in the docs to make sure #1610 is ready for review

[payjoin-bot]

spacebear21

@spacebear21

Shipped

PRs merged:

• Receiver fallback typestate

Last Week

Review your previous thread: Last week's thread

[payjoin-bot]

arminsabouri

@arminsabouri

Shipped

PRs reviewed:

• Join and PartialJoin traits
• payjoin-cli WalletCreateFundedPSBTOptions accept Option
• nix: cargo-sort improvements
• nix: separate flake checks for prop and unit test coverage

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR has requested changes: Add honest overview

[payjoin-bot]

benalleng

@benalleng

Shipped

PRs merged:

• Bump payjoin version to 1.0.0-rc.3
• Merge Cancel and Failure variants
• Test utils feature unification
• Update cargo-mutants to 27.1.0
• payjoin-cli WalletCreateFundedPSBTOptions accept Option
• Not --all-features test suite

PRs reviewed:

• Receiver fallback typestate
• Test Nix dev shell setup
• feat: port payjoin core to no_std
• Mailroom EMFILE resilience
• Stabilize 1.0 errors by carving out errors used in state machine control flow & keeping the rest opaque
• Document BIP77 v1 fallback behavior in create_post_request

Issues opened:

• Release payjoin-1.0.0-rc.3
• Remove cancel/failure SessionOutcome variants
• Does the payjoin-cli cancel have the correct semantics?
• Move to drop io by default in payjoin-test-utils

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Make Cargo-minimal and Cargo-recent lockfiles follow expected convention
• PR awaiting review: Skip taproot coins in payjoin-cli

[benalleng]

Focus

• Trying to wrap up some outstanding payjoin-cli issues that will open the door for people working on the AS-aware logic to work without expectations of rebases following All sessions in resume share the same relay instead of randomizing independently #1391, RelayManager does not completely manage relays #1582
• Upgrade liana to use payjoin-1.0.0-rc.3 to demonstrate the new API before we have it published in any of the binding languages [WIP] Payjoin receiver wizardsardine/liana#2011.
  • Got a review from pyth, he is hoping to feature gate it to start merging bits and pieces before a full release and has a question about the db overlap

Bottleneck

• unfortunately we can't get any of the integrations up on the latest release until spacebear is back as AFAIK he has most of the credentials for posting those binding packages.

[payjoin-bot]

chavic

@chavic

Shipped

PRs merged:

• Test Nix dev shell setup

PRs reviewed:

• Rename EncapsulationError to DecapsulationError

Last Week

Review your previous thread: Last week's thread

[chavic]

Shipped

Merged uniffi-dart:

• Test Nix dev shell setup — added formatter coverage without Dart churn; benalleng's requested changes resolved and approved. Test Nix dev shell setup Uniffi-Dart/uniffi-dart#136

Merged BTCPay Payjoin plugin (reviews):

• Reviewed and approved the accounting bridge / unify receiver outputs — re-acked after squash and merged. feat: Add accounting bridge and unify receiver outputs ValeraFinebits/btcpayserver-payjoin-plugin#41
• Reviewed and approved Enable Payjoin v2 by default. feat: Enable Payjoin v2 by default ValeraFinebits/btcpayserver-payjoin-plugin#43

Merged rust-payjoin (review):

• Reviewed and approved Rename EncapsulationError to DecapsulationError. Rename EncapsulationError to DecapsulationError #1601

Focus

BTCPay Plugin:

• Clear review backlog in BTCPay Plugin and Uniff-dart
• 2nd Progress demo video (snapshot) with Bull Bitcoin as sender
• UX/correctness review pass — correctness first; update todos and issue trackers with findings before starting.

Blockers

• Reviewing the current RC API and resetting Bull Bitcoin

[payjoin-bot]

zealsham

@zealsham

Shipped

PRs reviewed:

• Skip taproot coins in payjoin-cli

Issues opened:

• Payjoin-cli records an unresumable session event

Last Week

Review your previous thread: Last week's thread

Auto-detected signals:

• PR awaiting review: Ohttp middleware
• PR awaiting review: Use tower-http corslayer for handling cors
• PR has requested changes: OHTTP keys should be rotated

[zealsham]

focus

• finish up Payjoin-cli should cache ohttp-keys for re-use #1035

[payjoin-bot]

Mshehu5

@Mshehu5

Shipped

PRs reviewed:

• Use tower-http corslayer for handling cors
• Join and PartialJoin traits
• nix: cargo-sort improvements
• nix: separate flake checks for prop and unit test coverage

Last Week

Review your previous thread: Last week's thread

[Mshehu5]

Shipped :
Kept getting an error in bdk-cli on regtest while testing out somethings. it was cause uncorfirmed coins were being selected/contibuted for payjoin pushed bitcoindevkit/bdk-cli@6ff444a as a fix

Focus :
need to sort out some conflicts and changes on #1514 then start pushing smaller PR's

Bottleneck:
Preparing btc plus plus talk might have taken more of my time than expected last week

[payjoin-bot]

0xZaddyy

@0xZaddyy

Shipped

No activity found.

Last Week

Review your previous thread: Last week's thread

[0xZaddyy]

Focus

• Append-only mailbox looks good now, will be working with Armin to build Demo and test how this works better.
• work on other possible ways multiparty can be supported

[ValeraFinebits]

Shipped

PRs opened:

• fix: fix legacy sender compatibility and invoice accounting ValeraFinebits/btcpayserver-payjoin-plugin#45

Issues opened:

• Unify Payjoin UI wording to "Async Payjoin" ValeraFinebits/btcpayserver-payjoin-plugin#46
• Clarify checkout UI when Standard Bitcoin is selected ValeraFinebits/btcpayserver-payjoin-plugin#47
• Enhance relay and directory handling: support multiple entries, add retry logic ValeraFinebits/btcpayserver-payjoin-plugin#49
• Consider supporting an internal mailroom in the future ValeraFinebits/btcpayserver-payjoin-plugin#50
• Research PR payjoin/rust-payjoin#1558: Receiver fallback typestate and required plugin updates ValeraFinebits/btcpayserver-payjoin-plugin#51

Testing:

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

Focus

• Continue working on the plugin.

[bc1cindy]

Shipped

PRs reviewed:

• Add radix-ness classifier as first step of the radix lower-bound path tx-indexer#85
• Add Payjoin Receiver Support (BIP 77) lightningdevkit/ldk-node#746
• [Draft] Payjoin Submarine Swap Consolidation BoltzExchange/boltz-backend#892
• Document BIP77 v1 fallback behavior in create_post_request #1593
• payjoin-cli WalletCreateFundedPSBTOptions accept Option<FeeRate> #1595
• Test utils feature unification #1599
• scrub: some left over fixes concurrent-psbt#31
• nix: cargo-sort improvements concurrent-psbt#33
• nix: separate flake checks for prop and unit test coverage concurrent-psbt#34
• Scurbber crate  concurrent-psbt#32

Issues opened:

• Tracking: chain-observable transaction-level fingerprinting #1597
• RBF nsequence: non-canonical 0x01, only on inputs[0] mrtnetwork/bitcoin_base#22
• Payjoin receiver skips UIH2 avoidance, always contributes unspent[0] cake-tech/cake_wallet#3303
• RBF nsequence: non-canonical 0x01, only on inputs[0] cake-tech/cake_wallet#3302

PRs opened:

• Fix RBF nsequence: canonical value, all inputs cake-tech/bitcoin_base#12
• Fix RBF nsequence: canonical value, all inputs mrtnetwork/bitcoin_base#21
• fix: Payjoin receiver skips UIH2 avoidance, always contributes unspent[0] cake-tech/cake_wallet#3304

Focus

• fingerprint analysis across integrations
• reviews

[vadim-anfv]

/check-in

[payjoin-bot]

Shipped

PRs reviewed:

• Split resume session relays

Issues opened:

• relay payjoin.achow101.com from the example config is unreachable

[xstoicunicornx]

/check-in

[payjoin-bot]

Shipped

PRs merged:

• Fix check_payment docstring
• Employ new fallback_tx method
• Fix commented test assert

PRs reviewed:

• Multiple test utils relays
• Add choose_relay method in RelayManager
• Split resume session relays
• Receiver fallback typestate
• Attach --no-run to the feature gated test runs just to ensure compilation
• Test utils feature unification
• Add max_fee_rate() method to Config to encapsulate default
• Update cargo-mutants to 27.1.0
• Document BIP77 v1 fallback behavior in create_post_request
• Not --all-features test suite

Focus

• Rename Reference and TaggedReference entities in Non-blocking Interface for Payjoin State Machine  #1446

Bottleneck

Staring foray into AI agents/harnesses this week (been saving my #1446 updates for this... heheh)

[caarloshenriq]

/check-in

[payjoin-bot]

Shipped

No activity found.

Auto-detected signals:

• PR awaiting review: feat: port payjoin core to no_std

[DanGould]

Thank you for your no_std PR. This shows "PR awaiting review," and it looks like @benalleng gave a thorough first pass and is awaiting your response