UwU · Proof-of-Payment Protocol

The proof-of-payment layer for bank rails and ledgers.

A UPI transaction enters as a private bank event, exits as a signed, on-chain attestation readable by smart contracts.

The gap

Two economies.
Parallel rails.
No bridge.

UPI clears $1.5T a year. Now blockchain sees all of it.

Private bank events. Opaque to contracts.

Open ledger state. Blind to rupees.

State machine

Five states. One settlement.

Live trace · P2P On-Ramp

Trustless Stablecoin for INR.

Off-chain · Bank rail

Buyer · Anjali R.

HDFC •••• 4421

INR 41,832

via UPI to seller@hdfcbank

Awaiting on-chain intent

UPI transfer · INR 41,832

AA consent granted (Setu)

Bank statement read

Off-chain leg complete

DVN · QUORUM

watching...

rate: 1 USDC = ₹83.66

On-chain · Algorand

Seller · 0x4f…a3b1

Algorand mainnet

500 USDC

locked in escrow #8842

ESCROW.lock(500 USDC)

RUNNING

State: LOCKED

Awaiting attestation

DVN.attest() received

RELEASE → counterparty

STATE S0 · INTENT

tx: 5c19c9f1

Counterparty locks the asset in a UwU-compatible escrow with a target UPI handle and expected amount.

ESCROW.lock()

attestation.json

pending

{

"version": "uwu/v1",

"network": "algorand:mainnet",

"upiRef": "9CBCD022AF",

"amount": "₹41,832",

"payee": "seller@hdfcbank",

"aaSource": "setu",

"observedAt": 1747958400,

"signers": ["DVN-01", "DVN-02", "DVN-03"],

"txId": "1594BEA1…"

}

Architecture

Four layers. One rail.

LAYER I

Sources

AA-licensed sources

Setu reads the bank statement, with user consent.

Setu

RBI framework

DEPA

LAYER II

Verifiers

DVN quorum

Independent nodes sign the attestation. 2-of-3 quorum.

Ed25519

Slashable stake

LAYER III

Registry

On-chain registry

Canonical Algorand app, indexed by UPI ref.

ASC1

≤ 0.001 ALGO read

LAYER IV

Consumers

Verification hooks

Any contract can listen, gate, settle.

Escrow primitives

Cheap clones

Developer kit

Three primitives. Ship in a day.

01 · CLIENT SDK

@uwu/sdk

npm

import { UwU } from "@uwu/sdk";

// One line. UPI intent → on-chain attestation → release.
const result = await UwU.attestAndRelease({
  escrow: "esc_8842",
  expect: {
    payee: "seller@hdfcbank",
    amount: 41832,
    window: "30m",
  },
  aa: "setu",
  atomic: true;
});

// → result.attestationId, result.txId, result.released

02 · CONTRACT LIBRARY

Ready-to-deploy primitives

audited

EscrowP2P

Counterparty escrow with UPI attestation gate.

EscrowCollateral

Mark a loan settled; auto-release NFT collateral.

EscrowRWA

Mint fractional shares on bank-verified INR receipt.

VerifyHook

1-line listener for any existing contract.

03 · REFERENCE IMPL

The UwU P2P Exchange — a proof, not a focus.

Our flagship dex demonstrates the framework end-to-end, positioning itself as the sole trustless P2P dex.

Roadmap

One chain today.
Every chain tomorrow.

v1 · now

shipping

Attestations + escrow primitives

Setu live on testnet.

v1.5 · Q3

Cross-chain via State Proofs

Algorand becomes the hub. Ethereum and Solana consume.

v2 · '27

horizon

Zero-knowledge privacy

Public fact, private details. RWA-grade compliance.

ENDGAME · proof-of-payment infrastructure. Fiat transfer → on-chain proof → programmable settlement.