SCF Round 46 ยท Stellar Testnet MVP

Stellar payments with optional privacy.

Zellar is a Stellar-native payment app MVP that combines simple user onboarding, public payment flows, and optional privacy-preserving payments through STEALTH, a Soroban privacy-payment module.

Explore the MVP View current traction

MVP

A payment app users can understand.

Zellar is designed to hide technical payment complexity while keeping authorization explicit. Wallet signing, custody, and settlement are never hidden from the user.

Onboarding

Email/session infrastructure is being prepared for a controlled Testnet MVP. Wallet choice remains separate from account signup.

Payments

The MVP targets send, receive, request, and payment-review flows for Stellar assets, starting with safe Testnet paths.

Privacy option

STEALTH adds an optional privacy-preserving route so private payments live inside the app rather than as a separate technical workflow.

STEALTH privacy module

Soroban privacy-payment primitives for Zellar.

STEALTH is currently a local research module being prepared for safe Testnet integration. It is not presented as audited, production-ready, or deployed on mainnet.

1

Create note

Payment note material is generated client-side.

2

Bind domain

Proof context is tied to pool, asset, network, and version.

3

Prove locally

Witnesses and secrets remain outside servers.

4

Settle on Soroban

Contracts enforce commitments and nullifiers.

Current traction

Pre-Testnet MVP work is underway.

The current build is intentionally safety-gated: no mainnet deployment, real assets, custody, wallet-secret storage, or unreviewed signing has occurred.

Built locally
  • Zellar app/backend direction with Supabase staging for auth and session development.
  • STEALTH local Soroban/Stellar privacy-payment research module.
  • Local circuit and browser SDK artifact rebuilds.
  • Public artifact manifest and verification script.
  • Tested STEALTH_DOMAIN_V1 binding for pool, asset, network, and protocol version.
Grant milestone
  • Phase 1Public website and MVP plan
  • Phase 2Zellar onboarding + payment review
  • Phase 3Stellar Testnet payment path
  • Phase 4STEALTH privacy-payment test flow
  • Phase 5Review, hardening, and user testing

What we are building toward

A usable Zellar Testnet MVP for SCF review.

The requested SCF support will move Zellar from local prototype and architecture work into an accessible Testnet product with a visible privacy-payment path.

Integrations used

Stellar, Soroban, Supabase, Freighter, SEP-7, Stellar SDK, Passkey Kit pilot, Circom, Groth16, BN254, wasm-bindgen, and browser-local artifact verification.

Safety boundary

Private note material, witnesses, recovery data, and wallet secrets must remain client-local. Servers coordinate app state; they do not custody funds or secrets.

Success criteria

A public MVP where testers can understand Zellar, complete basic Testnet payment flows, and evaluate an optional STEALTH privacy-payment path.