Sunday, September 13, 2026

Open Source Finternet Model

 Prompt:

I am thinking of a paradigm that prevents a global monopoly.. thinking of a relay marathon where all participants are given a relay and can stop running anytime giving it to anyone willing to take it forward.. how can open source and temporarily for profits make this a reality for finternet as a platform of digital payments?

Response:

Yes. I think your relay-marathon analogy is actually a useful governance paradigm for the Finternet—and it leads to a different question from simply “How do we make Finternet open source?”

The question becomes:

How do we design a financial infrastructure in which no participant can permanently own the race?

The BIS Finternet proposal itself explicitly argues for multiple interoperable ledgers rather than one dominant ledger, and describes a “network of networks” with interoperability, modularity and evolvability. (Bank for International Settlements) India’s DPI experience similarly relies on public infrastructure plus private-sector innovation and interoperability. (Bank for International Settlements)

Your relay idea could add an important economic/governance layer that isn't captured merely by saying “open and interoperable.”

1. Think of the Finternet as a relay race

Imagine that a Finternet payment service is a baton.

There are several participants:

Protocol → Ledger → Payment provider → Wallet → Merchant → User

But nobody owns the baton forever.

A participant can say:

“I don't want to operate this component anymore.”

It must then be possible for another qualified participant to take over without the ecosystem collapsing.

That gives us a principle:

Transferability of participation

Not just:

“Anyone can join.”

But:

“Anyone capable of satisfying the rules can take over an existing role.”

That's much stronger.


2. Open source alone doesn't prevent monopoly

This is the important distinction.

Suppose we release the entire Finternet payment stack as open source.

Company A forks it.

Company A becomes enormously successful.

Eventually:

  • merchants depend on A

  • users depend on A

  • developers depend on A

  • liquidity accumulates around A

  • APIs become A-specific

  • data becomes A's moat

  • switching becomes painful

The source code remains open.

But the ecosystem has become economically closed.

This is essentially the problem with many “open” ecosystems.

So I would separate three forms of openness:

LayerQuestion
Code opennessCan I inspect and fork the software?
Protocol opennessCan I participate using the same protocol?
Economic opennessCan I replace an incumbent without losing the ecosystem?

Your relay concept is particularly interesting because it attacks the third one.


3. “Temporary for-profit” becomes interesting here

I wouldn't try to eliminate profit.

I'd make profit a temporary reward for carrying the baton.

For example:

A company builds a very good Finternet payment router.

For five years it can make money from:

  • transaction processing

  • premium services

  • performance fees

  • enterprise integration

  • liquidity services

  • analytics where legally permissible

But it doesn't receive permanent ownership of the underlying infrastructure.

The fundamental protocol remains open.

And crucially, the right to operate the service is separable from ownership of the protocol and user assets/data.

That creates something like:

Profit from operating infrastructure ≠ ownership of infrastructure.

That's a very powerful distinction.


4. The baton needs to contain the state

This is where the analogy becomes technically meaningful.

Imagine Company A operates a payment node.

It shouldn't possess an irreplaceable database containing:

“Everything necessary to continue the financial relationship.”

Instead, the system should define a portable state:

USER
 │
 ├── identity / credentials
 ├── permissions
 ├── assets
 ├── transaction history
 └── preferences
        │
        ▼
   FINTERNET PROTOCOL
        │
 ┌──────┼──────┐
 ▼      ▼      ▼
Node A Node B Node C

If A disappears:

A stops
   │
   ▼
State remains valid
   │
   ▼
B takes over
   │
   ▼
User continues

The user's financial life shouldn't have to be re-created merely because a company disappeared.

That is the essence of the relay.


5. I would introduce a new design principle

You could formulate this academically as:

Continuity without incumbency

A Finternet service should remain operationally transferable between independent participants without requiring users to abandon their assets, identities, permissions, transaction history or interoperability.

That is stronger than interoperability.

Interoperability says:

A talks to B.

Your principle says:

If A disappears, B can replace A.

That is resilience against monopoly.


6. And this gives you a potentially interesting research problem

You could model a Finternet ecosystem as a graph.

Nodes:

  • banks

  • payment providers

  • wallets

  • ledger operators

  • identity providers

  • liquidity providers

  • compliance providers

  • developers

Edges:

  • payment

  • identity

  • settlement

  • authentication

  • messaging

  • liquidity

  • data exchange

Now define replaceability.

For a critical service SS:

R(S)=number of qualified alternative providersswitching costR(S)=\frac{\text{number of qualified alternative providers}}{\text{switching cost}}

A healthy Finternet would try to maintain:

R(S)1R(S) \gg 1

for every critical component.

A monopoly emerges when:

R(S)0R(S) \rightarrow 0

even if the software itself is open source.

That's potentially a much more interesting research direction than simply saying “Finternet should use blockchain/open source.”


7. The relay needs rules for handing over the baton

This is where governance becomes crucial.

Suppose a payment provider wants to quit.

The protocol could require:

Before exiting

  1. Publish its current interoperable state.

  2. Notify dependent participants.

  3. Allow another certified operator to assume the role.

  4. Transfer cryptographic credentials according to predefined procedures.

  5. Preserve auditability.

  6. Preserve user portability.

  7. Continue service during a transition period.

Then:

        OPERATOR A
             │
       "I am exiting"
             │
             ▼
      TRANSITION WINDOW
             │
       ┌─────┴─────┐
       ▼           ▼
    Operator B   Operator C
       │
       ▼
   takes baton
       │
       ▼
     USERS
continue normally

The company can leave.

The infrastructure doesn't.


8. This also changes how we should think about startups

This is perhaps the most exciting part of your idea.

Today a startup often thinks:

“How do I build something so users cannot leave?”

Your Finternet model could encourage:

“How do I build something so good that users choose me, even though they can leave?”

That's a fundamentally different competitive environment.

A company gets rewarded for:

  • efficiency

  • UX

  • reliability

  • innovation

  • lower costs

  • better services

rather than:

  • lock-in

  • proprietary formats

  • data captivity

  • network effects deliberately made non-portable.


9. There is already a philosophical precedent in India's DPI

This isn't completely alien to the Indian architecture.

RBI has described India's DPI approach in terms of public digital infrastructure, private innovation, open access, interoperability and competition. (Reserve Bank of India)

And UPI demonstrates an important version of the idea: the underlying payment infrastructure is separated from the customer-facing applications. Current UPI scale illustrates why this separation can support a large ecosystem rather than requiring one consumer application to own the whole experience. (Reuters)

Your proposal could push this one step further:

Don't merely make the interface interoperable. Make the economic role itself replaceable.


10. I would NOT make everything permanently non-profit

That could kill innovation.

Instead, think:

Open core + competitive operators + temporary rents

Something like:

                 OPEN FINTERNET PROTOCOL
                         │
        ┌────────────────┼────────────────┐
        │                │                │
     Operator A       Operator B       Operator C
        │                │                │
        └─────── compete on service ─────┘
                         │
                         ▼
                    USERS / ASSETS

Each operator can make money.

But:

The protocol cannot be privately captured.

The user relationship cannot become permanently captive.

The state cannot be held hostage by one operator.

Another operator can pick up the baton.


11. There is an even deeper idea here

You could make “exit” a first-class primitive.

Most software systems have:

  • authentication

  • authorization

  • transaction

  • settlement

  • recovery

Your architecture would explicitly have:

EXIT / HANDOVER

as a protocol operation.

For example:

REGISTER
AUTHENTICATE
TRANSFER
SETTLE
REVOKE
RECOVER
HANDOVER

The system would be designed from day one around the assumption:

Every operator is temporary.

That's a profound architectural constraint.

It changes how you design APIs, databases, credentials, data formats, governance and business models.


12. And this fits remarkably well with your earlier Finternet/UI research

You've been thinking about AI-generated QML interfaces running on a distributed infrastructure.

There's a nice connection.

Imagine:

                 FINTERNET
                    │
             Open protocol layer
                    │
        ┌───────────┼───────────┐
        │           │           │
      Cloud A     Cloud B     Local Node
        │           │           │
       AI/UI       AI/UI       AI/UI
        │           │           │
        └───────────┼───────────┘
                    │
                  User

The UI provider can change.

The cloud can change.

The AI model can change.

The payment provider can change.

The user's financial state survives all of those changes.

That gives you a much larger concept:

Portable computation + portable financial state + replaceable operators

And that is beginning to look less like another payment app and more like a design philosophy for the Finternet.


The phrase I'd keep

If you want to develop this into a PhD/research idea, I would keep the relay metaphor but give it a formal name:

The Relay Principle: Critical digital-financial infrastructure should be designed so that any qualified participant can relinquish or assume an operational role without disrupting user continuity or transferring permanent control over the underlying protocol, assets or identity.

And the economic model:

“Temporary profit, permanent openness.”

That is, in my view, considerably more interesting than simply proposing “an open-source Finternet.”

The BIS itself says the Finternet should not be a single “one ledger to rule them all,” but a set of interoperable ledgers and networks. (Bank for International Settlements) Your relay principle could be a governance/economic mechanism for making that network-of-networks resistant to concentration.

If you develop this further, I would formulate it as a formal “anti-monopoly architecture” for Finternet, with measurable properties such as replaceability, exit cost, state portability, operator concentration and recovery time. That could become a much sharper research contribution than a generic open-source-payment-platform proposal.

Thursday, June 4, 2026

How do you think eRupee CBDC or Programmable CBDC can coexist with Rupees in bank accounts?

Onto banking system and checking frauds before they happen, RBI is mulling using erupee to avoid frauds from taking place.. how do you think erupee cbdc can coexist with ordinary rupees in ordinary bank accounts.. won't it require rampant banking changes in software?

This is a genuinely fascinating systems question — part monetary design, part software architecture. Let me break it down properly.


The Core Idea: Why eRupee for Fraud Prevention?

The key insight RBI is working with is programmability and traceability. Every eRupee transaction is traceable, meaning less fraud and fewer missed subsidies. Programmable payments can ensure money is spent only for intended purposes — school fees, healthcare, groceries.

This is fundamentally different from ordinary rupees in bank accounts. A regular NEFT/IMPS transfer is settled but not governed — once money moves, it's gone and free. eRupee can carry conditions with it.

Programmable CBDC (PCBDC) is a rule-based version of the Digital Rupee that allows money to be "programmed" so it can be used only for specific purposes, in specific locations, or within a defined time period.


Coexistence Architecture: How It Actually Works

This is the crux of your question — and the answer is two-layer monetary system, not a replacement.

Layer 1 — Commercial Bank Money (existing) Your savings/current account balance. Credit-created money, governed by fractional reserve banking. Flows via NEFT/RTGS/UPI.

Layer 2 — CBDC (eRupee) Direct liability of RBI, not the commercial bank. Flows via a separate wallet infrastructure. It is fully interchangeable with existing currency at par (1:1), combining the trust of physical currency with the efficiency of digital payments.

The conversion gateway between Layer 1 and Layer 2 is where banks sit — you debit your savings account, and an equivalent eRupee is issued to your wallet by the bank acting as a distribution intermediary.


The Banking Software Question — Yes, It's Massive

You're absolutely right to flag this. The software changes are non-trivial on multiple dimensions:

1. Core Banking System (CBS) Changes Banks run on ancient CBS platforms (Finacle, BaNCS, Flexcube). They were built around the concept of accounts — a balance held by the bank. CBDC flips this: the balance is held by RBI, and the bank is just a pipe. This means:

  • New wallet ledger subsystem separate from account ledger
  • Real-time gross settlement hooks at the individual transaction level
  • Changes to reconciliation, end-of-day balancing, and liquidity management

2. Interoperability Layer Integration with UPI and fintech platforms is how CBDC can modernize India's payments ecosystem. But UPI today rides on bank account rails. Plugging eRupee wallets into UPI required building a new NPCI-level protocol bridge — which is ongoing.

3. Programmability Engine This is the hardest part. Programmable use cases like subsidies, travel allowances, and geo-locked payments require a smart contract-like rules engine embedded in the transaction processing stack. Each eRupee token (or token batch) needs to carry metadata — expiry, permitted merchant categories, geography — and every payment terminal/gateway needs to validate these rules at the moment of spend.

4. Offline CBDC — A Completely Different Beast A solution from Bank of Baroda's Innovation Centre proposed leveraging existing ATMs and POS machines to help citizens without smartphones use digital currency offline. This means secure local validation without internet — essentially embedding cryptographic state machines in hardware, which is a whole new firmware/HSM problem.


The Systemic Risk RBI Has to Manage

If people move money from bank accounts to CBDC wallets, it could affect bank liquidity and loans. This is called disintermediation risk — if everyone holds eRupee directly, commercial banks lose the deposit base they use for lending. The entire credit creation mechanism of the economy could compress. RBI is likely to impose wallet limits for exactly this reason.


Where It Stands Right Now

The value of eRupee in circulation jumped to ₹1,016 crore at end of March 2025, up from ₹234 crore a year earlier. Still tiny. And RBI's agenda for 2025-26 includes exploring CBDC pilots on cross-border payments on both bilateral and multilateral bases, targeting remittance efficiency given India being the world's largest recipient of remittances.

The fraud-prevention and cross-border angle is where eRupee makes its strongest case — because programmable, traceable money is genuinely harder to launder or misdirect than conventional transfers.


TL;DR for the Software Question

Yes — rampant banking changes. But the design philosophy is deliberately additive rather than replacement:

  • Existing CBS stays; a new CBDC ledger layer is bolted alongside it
  • UPI gets a wallet interop bridge
  • A programmability/rules engine is a greenfield build
  • Offline CBDC needs hardware-level cryptographic solutions

The real engineering challenge isn't the happy-path flow — it's reconciliation, fallbacks, and the edge cases when eRupee rules conflict with merchant systems or network failures. India's payment stack (NPCI, UPI) has shown it can move fast on this, but CBDC is structurally more complex than UPI ever was.

Sunday, April 12, 2026

Happy 10th Birthday UPI

A Decade of Digital Magic: Celebrating 10 Years of UPI

On April 11, 2026, India officially marked a decade since the National Payments Corporation of India (NPCI) launched the Unified Payments Interface (UPI). What began as a pilot program in 2016 has matured into the world’s most powerful real-time payment ecosystem, fundamentally shifting India from a cash-dependent economy to a global digital leader.
The Numbers: A 12,000x Explosion
The scale of UPI’s growth over the last ten years is almost hard to process. In FY26, the system is projected to hit a staggering 219 to 240 billion transactions. To put that in perspective:
  • Volume Growth: Since FY17, transaction volumes have jumped over 12,000 times.
  • Value Surge: From ₹6,952 crore in its first year to nearly ₹285 lakh crore in FY26.
  • Global Dominance: India now accounts for approximately 49% of all global real-time payment transactions.
Beyond the Wallet: Key Milestones
UPI isn't just about scanning a QR code at a tea stall anymore. In 2026, its features reflect a highly sophisticated financial platform:
  • Credit on UPI: The integration of credit lines and RuPay credit cards has turned UPI into a comprehensive lending tool.
  • UPI Lite & 123Pay: These innovations brought digital payments to feature phone users and simplified small-value transactions without needing a PIN.
  • Higher Limits: As of September 2025, the transaction limit for select verified categories like healthcare and education was raised to ₹10 lakh per day, allowing for high-value digital payments.
Taking Over the World
The "India Stack" has officially gone global. By 2026, UPI is operational in countries including the UAE, Singapore, France, Mauritius, Sri Lanka, Nepal, and Bhutan. Its entry into Europe through France and recent expansion into Malaysia and Qatar marks its transformation into an international benchmark for interoperability.
Why It Worked
While tech played a part, the real hero was trust. With a success rate of 99.2% (far outperforming credit cards), UPI became the default choice for over 500 million active users and 65 million merchants. It democratized banking, giving a street vendor in a remote village the same transacting power as a CEO in Bengaluru.
As we look toward the next decade, the goal is clear: reaching a billion daily transactions and further bridging the gap between urban and rural India.

Friday, March 27, 2026

Year wise aggregate balance in PMJDY accounts and the Monthly Average Balance

 Here is a clean, consolidated year-wise dataset of PMJDY (Pradhan Mantri Jan Dhan Yojana) focusing on:

  • Aggregate deposits (₹ crore / lakh crore)

  • Average balance per account (MAB / per-account deposit)

I’ve combined official government releases + PIB + compiled datasets to give you the closest consistent time series since launch (2014).


📊 Year-wise PMJDY Deposits & Average Balance

📌 Phase 1–Growth Years (2015–2023 official compiled series)

Year (Aug)Total Deposits (₹ crore)Avg Balance per Account (₹)
201522,9011,279
201642,0941,747
201765,7992,187
201882,0392,521
20191,02,4152,783
20201,30,0863,219
20211,46,2303,398
20221,73,9543,761
20232,03,5054,063

Source insight: Deposits increased ~13× between 2015–2023, while average balance grew ~3.8× (Press Information Bureau)


📌 Recent Years (2024–2026 latest data)

YearTotal DepositsAvg Balance
2024 (est.)~2.3–2.4 lakh crore~₹4,500–₹4,800
2025 (FY end)~2.6 lakh crore~₹4,700+
2026 (Feb)₹2.95 lakh crore₹5,110

Source: Latest financial data shows strong rise in both total balances and per-account deposits (The Financial Express)


📌 Latest Snapshot (2026 official portal)

  • Total deposits: ₹2.98 lakh crore (~₹298,221 crore)

  • Accounts: ~57.8 crore
    → Confirms consistency with above trend (PMJDY)


📈 Key Trends (Very Important Insights)

1. Exponential deposit growth

  • ₹22k crore (2015) → ~₹3 lakh crore (2026)
    👉 ~13–14× increase

2. MAB steadily rising (critical signal)

  • ₹1,279 → ₹5,100
    👉 Indicates:

  • Shift from zero-balance accounts → active savings accounts

  • Strong DBT (Direct Benefit Transfer) inflows

3. Growth phases

  • 2014–17: Rapid account opening + demonetisation spike

  • 2018–21: Stabilization + DBT integration

  • 2022–26: Deepening usage (higher balances)

4. Structural shift

Originally:

  • Many accounts were zero-balance

Now:

  • Average > ₹5,000
    👉 Indicates real financial inclusion, not just account creation


⚠️ Important Caveats (for your research)

  • No single official year-wise time series published continuously
    → Data must be stitched from:

    • PIB reports

    • PMJDY portal snapshots

    • Parliamentary answers

  • “MAB” is not formally reported as banking MAB
    → What we use is:
    👉 Average deposit per account = Total deposits / total accounts


🧠 If you're doing deeper analysis

You can derive:

1. True MAB proxy

[
\text{Avg Balance} = \frac{\text{Total Deposits}}{\text{Accounts}}
]

2. Financial inclusion depth

Track:

  • % zero-balance accounts

  • DBT inflow share

  • Rural vs urban balances


👍 If you want next level insight

I can help you with:

  • 📊 Full year-wise dataset in Excel format

  • 📉 Graphs (growth, CAGR, per-account trend)

  • 🔍 Correlation with:

    • DBT transfers

    • UPI adoption

    • Cash-to-GDP ratio (your earlier question!)

Just tell me 👍

Graphs Please: