pm/draft-roadmap/integrate_rln_with_waku_api.md

# Integrate RLN With the Waku API

**Estimated date of completion**: 30 Sep

**Resources Required for 2025H2**:
- 2 nwaku engineer for 2 months 
- 1 js-waku engineer for 2 months
- 1 core research for 1 month
- Support from Vac/ACZ to get zerokit working in the browser.

Deliver a native RLN library with a deliberate API to manage RLN memberships, as well as proof verification and generation.
This includes extracting RLN Relay as a relay plugin validation strategy, that can then be passed internally to nwaku node
as any other strategy.

Once delivered, usage of Chat SDK of RLN becomes possible, with clear API to instantiate nwaku library with RLN, as well
as API to manage RLN membership.

Introduce RLN proof generation and validation in the Browser. RLN API should be similar across all implementations.

Finally, migrate to Status network L2 testnet and improve UX issues discovered via dogfooding such as rate of RPC Calls.

## Strategic Objective

Logos Movement Module Build Out

## FURPS

See deliverables.

## Risks

| Risk                                                  | (Accept, Own, Mitigation)                                                                                                                                                                                                                               |
|-------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| Not all required improvements are yet identified      | Dogfooding of the H1 delivery will enable identification of needed improvements, meaning this milestone may change in term of scope and schedule.                                                                                                       |
| Dependencies on Nim Web3 library                      | Previous upgrade of nim web3 libraries have lead to various issues. The dependencies of said library is increasing, meaning potential delay in development.                                                                                             |
| Uncertainty regarding zerokit and wasm in the browser | UX-related property are yet to be explored with the new RLN smart contract. WASM loading and execution may have considerable impact on UX. Collaboration with Vac/ACZ will be required to adapt zerokit for the browser.                                |
| Smart Contract Changes & Expertise                    | We expect functional extension of RLN smart contract to potentialy store multiple roots, and maybe other improvement depending on dogfooding. The Solidity knowledge in the team is limited/non-existent so we would need to rely on Vac-SC or upskill. |
| API Refactoring                                       | Extracting RLN as a validation plugin may ensue some API refactoring that may take longer than initially estimated. A conservative estimate will be done.                                                                                               |
| FFI to FFI interaction                                | The intent will be to have RLN and Waku SDK as 2 separate libraries that can be initialized in any language (e.g Golang). The nim to nim via FFI may raise unforeseen issues .                                                                          | 

## Deliverables 

### Implement RLN membership management in nwaku library

**Owner**: nwaku

**Feature**: [RLN Membership Management](/FURPS/application/rln_membership_management.md)

**FURPS**:
- F1. Can generate RLN credentials.
- F2. Can insert RLN membership in smart contract, with accompanying deposit.
- F3. Can extend RLN membership on smart contract.
- F4. Can withdraw deposit from smart contract.
- F5. Membership credentials are encrypted by default on local disk.

- U1. RLN membership details can be exported and imported.
- U2. Deployment details (address, chain id) are persisted by library and in exports.

- R1. Import and exports are interoperable across all implementations.

- S2. library can be used in Go applications; available on pkg.go.dev.
- S3. library can be used in Rust applications; import via git path.

- +2. Available for Linea Sepolia Testnet contracts.

**Checklist**:
- [ ] Specs: link to specs and/or API definition
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)

### Implement RLN Onchain Tree Proof generation and verification in the Browser 

**Owner**: js-waku

**Feature**: [RLN Relay](/FURPS/core/rln_relay.md)

**FURPS**:
- F4. Light push client can be configured to generate proof for outbound messages.
- F5. Filter client can be configured to verify proof for inbound messages.

- S2. Browser edge nodes can be configured to verify and generate proofs.

**Checklist**:
- [ ] Specs: link to specs and/or API definition
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)

### Extract RLN as a plug-in library from nwaku 

**Owner**: nwaku

**Feature**: [Waku RLN API](/FURPS/core/rln_sdk.md)

**FURPS**:
- F1. Accepts RLN network configuration at initialization.
- F2. API to pass messages for proof validation.
- F3. API to import RLN credentials, compatible with RLN Membership management.
- F4. API to accept Waku Message and generate proof.
- F5. API to inform on configured rate limit parameters and remaining quota.

- U1. TWN RLN configuration is applied by default.
- U2. No boilerplate code beyond initialization is necessary to pass RLN instance in a Waku API implementation.
- U3. Rate usage is persisted across restarts.

- S1. library can be used in Go applications; available on pkg.go.dev.
- S2. library can be used in Rust applications; import via git path.
- S3. library can be used in Nim applications; import via git path.

- +1. Only one set of credentials can be used at a given t

**Checklist**:
- [ ] Specs: link to specs and/or API definition
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)

### Deploy RLN Contracts to Status L2 testnet

**Owner**: nwaku

**Feature**: [RLN Smart Contract](/FURPS/core/rln_smart_contract.md)

**FURPS**:
- +1. Smart Contracts are deployed on Status L2 Sepolia.
- +2. TWN uses smart contracts deployed on Status L2 Sepolia.

**Checklist**:
- [ ] Specs: link to specs and/or API definition
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)

### Improve RLN UX by reducing Web3 RPC calls

**Owner**: core research

**Feature**: [RLN Smart Contract](/FURPS/core/rln_smart_contract.md)

**FURPS**:
- U3. Application does not need to do a Web3 RPC call for every tree change to generate or validate messages.

**Checklist**:
- [ ] Specs: link to specs and/or API definition
- [ ] Code: link to GitHub issues/PRs/Epic
- [ ] Dogfood: link to dogfooding session/artefact
- [ ] Docs: links to README.md or docs.waku.org (TBD)