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microchipArchitecture

Adsterix is built as a Farcaster-native, onchain market for social attention.

The core idea is simple but powerful:

Farcaster lives on Optimism. Adsterix lives on Base. Adsterix verifies Farcaster state trustlessly across chains.

No indexers. No offchain assumptions. Just cryptographic proofs.

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Core chains

  • Base → Adsterix market, auctions, payouts, permissions

  • Optimism → Canonical Farcaster contracts and state

  • Ethereum → Shared trust anchor via the Beacon Chain

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High-level flow (cross-chain)

  1. Users interact with Adsterix through the MiniApp

  2. All economic logic executes on Adsterix contracts (Base)

  3. When Farcaster state is needed (FID, custody address, cast data):

    • Adsterix proves Optimism storage on Base

    • Using Ethereum as the root of trust

This makes Farcaster data natively usable inside Base contracts.

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Cross-chain verification: how it works

Adsterix uses storage proofs to verify Farcaster contract state from Optimism directly on Base.

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Step 1 — Ethereum Beacon Root (on Base)

Base exposes the Ethereum Beacon Root onchain.

This allows Adsterix contracts to:

  • access a trusted Ethereum state root

  • without trusting relayers or oracles

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Step 2 — Optimism State Root (via Ethereum)

Optimism periodically commits its state root to Ethereum using the AnchorStateRegistry contract.

From the Ethereum state root, Adsterix can:

  • prove the Optimism state root

  • fully onchain

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Step 3 — Farcaster storage proofs (Optimism → Base)

Once the Optimism state root is known:

  • Adsterix verifies specific storage slots

  • inside Farcaster contracts on Optimism

  • using Merkle storage proofs

This allows Base contracts to safely read:

  • FID → custody address mappings

  • registry data

  • Farcaster-native identifiers

All without trusting an indexer.

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Why this matters

This design turns Farcaster into a verifiable data layer, not just a social app.

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Benefits

  • 🔐 Trust-minimized Farcaster data is proven, not fetched

  • 🔗 True cross-chain composability Base contracts can depend on Optimism state safely

  • 🧠 Protocol-level guarantees Auctions and permissions can depend on Farcaster identity

  • 🚫 No backend trust assumptions Offchain services can improve UX, but cannot lie

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Example: verifying an FID on Base

To resolve a user’s custody address from an FID:

  1. Identify the Farcaster IdRegistry storage slot on Optimism

  2. Generate a storage proof against the Optimism state root

  3. Verify:

    • Ethereum Beacon Root → Ethereum state root

    • Ethereum proof → Optimism state root

    • Optimism proof → IdRegistry storage slot

  4. Use the verified value inside Adsterix contracts on Base

Result: Base contracts can reason about Farcaster identity natively.

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Design philosophy

Adsterix treats:

  • Farcaster as the social identity layer

  • Base as the economic settlement layer

  • Ethereum as the cryptographic anchor

Together, they form a cross-chain attention market that is:

  • onchain

  • composable

  • censorship-resistant

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