The recent proposal of CIP-0177: Ouroboros Tachýs introduces a faster variant of Ouroboros Praos designed for Cardano partner chains. While the CIP focuses on the consensus protocol itself, it opens up an exciting opportunity: using Cardano’s existing stake distribution to secure partner chains—creating a direct economic relationship where ADA holders, SPOs, and partner chains all benefit together.

In this post, I’ll explore how Tachys could enable truly “L1-secured” partner chains, where your existing Cardano stake helps secure new chains, and successful partner chains reward the ADA holders who support them.

What is Ouroboros Tachys?

Ouroboros Tachýs (Greek for “swift” or “rapid”) makes one key change to how Cardano’s Praos consensus works:

The Change: Replace Praos' private slot leader schedule with a public slot leader schedule

The Benefit: 4x higher block production rate, meaning:

The Trade-off: Less DDoS resistance (which matters less for smaller networks)

Why This Matters

Here’s the simple insight: Cardano mainnet could produce blocks 4 times faster than it currently does, but it deliberately leaves gaps between blocks for security. These “quiet periods” help the network stay secure even with attackers.

With a public schedule where everyone knows which pool produces each block, we can eliminate these gaps:

For smaller networks with fewer pools, losing the DDoS protection is acceptable—and the 4x speed boost is incredibly valuable.

The Missing Link: Economics

As currently proposed, Tachys partner chains would work like this:

  1. Launch a separate blockchain using Cardano’s code
  2. Find pools to run it (separate from mainnet pools)
  3. Build up stake on the new chain from scratch
  4. Run faster with custom parameters

The problem? No connection between mainnet and the partner chain. Your ADA delegation on mainnet doesn’t help secure partner chains, and successful partner chains don’t benefit mainnet ADA holders.

A Better Way: L1-Secured Partner Chains

Here’s the innovation: What if partner chains used Cardano mainnet’s stake distribution to determine who produces blocks?

How It Works (In Plain English)

Step 1: Pool Registration

An SPO who wants to help secure a partner chain registers through a smart contract on Cardano mainnet. They specify:

Step 2: The Indexer Watches

A service monitors Cardano mainnet to see:

Step 3: Computing the Schedule

Using the Tachys algorithm from CIP-0177, the service computes who produces blocks on the partner chain:

Step 4: Partner Chain Runs

Registered pools:

The Flow

┌──────────────────────────────────────────┐
│        Cardano Mainnet (L1)              │
│                                          │
│  ADA Holder → Delegates to Pool X        │
│  Pool X → Registers for Partner Chain    │
│                                          │
│  Registry Contract tracks:               │
│  - Which pools are participating         │
│  - Registration status                   │
└────────────────┬─────────────────────────┘
                 │
                 │ Indexer Service
                 │ - Reads stake distribution
                 │ - Computes block schedule
                 │
                 ▼
┌──────────────────────────────────────────┐
│        Partner Chain (Tachys)            │
│                                          │
│  Pool X produces blocks                  │
│  Earns partner chain transaction fees    │
│  Shares fees with delegators             │
└──────────────────────────────────────────┘

Who Benefits and How?

For ADA Holders (The Delegators)

Your delegation now secures multiple chains:

Example: You delegate 10,000 ADA to “SuperPool” on mainnet. SuperPool registers for three partner chains:

Your 10,000 ADA delegation now helps secure all three chains, and SuperPool earns transaction fees from all three to share with you—all without you doing anything extra.

For Stake Pool Operators (SPOs)

Additional revenue without additional stake:

The appeal:

For Partner Chain Builders

Instant security from day one:

The cost:

For Cardano Ecosystem

Direct economic alignment:

Network effects:

Following the Money: How Rewards Flow

Let’s trace a concrete example:

Gaming Chain launches:

  1. Setup: Gaming Chain pays registration incentives to attract 50 SPOs to register
  2. Operation: Gaming Chain processes 100 TPS of in-game transactions with small fees
  3. Revenue: Transaction fees accumulate in Gaming Chain treasury
  4. Distribution: Every epoch, fees are distributed to registered SPOs weighted by their mainnet stake
  5. Sharing: SPOs share these partner chain rewards with their delegators (just like mainnet rewards)

Your view as a delegator:

Mainnet Rewards (Epoch 500):
  Protocol rewards: 50 ADA

Partner Chain Rewards (Epoch 500):
  Gaming Chain fees: 8 ADA
  DeFi Chain fees: 12 ADA

Total: 70 ADA (40% boost from partner chains!)

The pool’s incentive:

This creates a powerful flywheel where everyone benefits from partner chain success.

Governance and Treasury: Funding the Ecosystem

Here’s where it gets really interesting: Cardano’s governance can directly fund partner chain development.

Multi-Asset Treasury

Cardano’s treasury will support multiple asset types, not just ADA. This means:

Partner chains can “donate” to Cardano treasury:

Example:

Governance Funding Flow

Now the real magic happens with Cardano governance:

Funding Partner Chain Projects:

  1. Developer wants to build on Gaming Chain
  2. Submits proposal to Cardano governance
  3. Requests funding in GAME tokens (not ADA!)
  4. ADA holders vote on proposal
  5. If approved, developer receives GAME from treasury
  6. Builds application on Gaming Chain

Why this matters:

The Donation Mechanism

The mechanics are straightforward:

Partner Chain Side:

Cardano Side:

Example Scenario

Year 1: Partner Chain Launch

Year 2: Ecosystem Development

Year 3: Value Appreciation

The virtuous cycle:

Real-World Use Cases

High-Frequency Trading DeFi

The Need: DEX needs sub-second finality for active trading

The Solution:

Government Records

The Need: National land registry needs blockchain but must comply with regulations

The Solution:

Gaming Ecosystem

The Need: Game needs high TPS with ultra-low fees

The Solution:

The Incentive Flywheel

This model creates compounding network effects:

More Partner Chains
      ↓
More Transaction Fees for SPOs
      ↓
Better Returns for ADA Delegators
      ↓
More ADA Staked on Mainnet
      ↓
More Secure Partner Chains
      ↓
More Successful Applications
      ↓
More Treasury Donations
      ↓
More Development Funding
      ↓
More Partner Chains (loop)

Every participant is aligned:

Implementation Path

Phase 1: Core Protocol (2025)

Phase 2: L1 Integration (2025–2026)

Phase 3: Economics (2026)

Phase 4: Production (2026+)

Open Questions

How to distribute partner chain rewards fairly?

Options:

What if a pool misbehaves on a partner chain?

Detection is easy (public schedule makes wrong blocks obvious), but enforcement is hard:

Can pools participate in multiple partner chains?

Likely yes, but considerations:

How to prevent hostile partner chains?

Registry contract could have requirements:

Comparison with Alternatives

vs. Traditional L2s (Rollups)

L1-Secured Partner Chains:

vs. Independent Sidechains

L1-Secured Partner Chains:

vs. Other L1 Blockchains

L1-Secured Partner Chains:

Why This Matters for Cardano

This isn’t just about scaling—it’s about alignment.

Today: Partner chains are satellites that might drift away

With L1-secured model: Partner chains are family members

The result:

Conclusion

Ouroboros Tachys enables something remarkable: a family of fast, customizable blockchains secured by Cardano’s mainnet stake, with direct economic benefits flowing to everyone who participates.

For you as an ADA holder:

For the Cardano ecosystem:

The vision: “Cardano on Cardano” isn’t just code reuse—it’s true economic and security alignment. Partner chains become extensions of Cardano, not competitors. Every successful application on a partner chain enriches the entire ecosystem.

This is how Cardano scales: not by making mainnet do everything, but by creating a family of specialized chains that all benefit from—and contribute to—the security and success of Cardano’s L1.

Resources

Acknowledgements

Thanks to Duncan Coutts and Philipp Kant for CIP-0177, and to the Cardano community for ongoing discussions about scaling and partner chain architecture.

Questions or feedback? Find me on X/Twitter or the CIP-0177 discussion thread.