What blockchain does ATLAST use?

ATLAST uses Base (an Ethereum L2) via the Ethereum Attestation Service (EAS). Base was chosen for low gas costs, high throughput, Ethereum security inheritance, and strong ecosystem support.

AI Agent + Blockchain

ATLAST Protocol optionally anchors AI agent evidence on Base blockchain via EAS (Ethereum Attestation Service) — creating permanent, public, independently verifiable proof of agent behavior.

Why Blockchain for AI Agents?

ATLAST's Evidence Chain Protocol (ECP) already creates tamper-proof SHA-256 hash chains. Blockchain anchoring adds three additional guarantees:

Permanence — once on-chain, records cannot be deleted by anyone
Public verifiability — anyone, anywhere can independently verify
Timestamping — blockchain provides an immutable, trusted timestamp

Important: Agent data (prompts, outputs, reasoning) NEVER goes on-chain. Only the SHA-256 hash is anchored. Your content stays private on your device. The blockchain only stores proof that the evidence exists and hasn't been tampered with.

How On-Chain Anchoring Works

Step 1: Agent creates ECP records

Every action is recorded locally as a signed, hash-linked evidence chain.

Step 2: Periodic hash anchoring

At configurable intervals, the latest chain hash is submitted to EAS on Base.

Step 3: Public attestation

An EAS attestation is created containing: agent DID, chain hash, timestamp, and record count.

Step 4: Independent verification

Anyone can verify: look up the attestation on Base → compare hash against the local evidence chain → cryptographic proof of integrity.

Why Base + EAS?

Low cost — Base L2 transactions cost fractions of a cent
Fast — 2-second block times
EAS standard — Ethereum Attestation Service is the leading attestation protocol
Ethereum security — inherits Ethereum L1 security guarantees
Ecosystem — interoperable with the broader Ethereum/Base ecosystem

On-Chain vs Off-Chain: Choose Your Level

Feature	Off-Chain Only (ECP)	On-Chain Anchored
Tamper-proof	✅ SHA-256 chain	✅ SHA-256 + blockchain
Self-verifiable	✅	✅
Public proof	❌ Private	✅ Anyone can verify
Permanent	Depends on storage	✅ Immutable
Cost	Free	~$0.001/anchor
EU AI Act	✅ Compliant	✅ Gold standard

When to Use On-Chain Anchoring

Not every agent needs blockchain. Here's when on-chain anchoring adds value:

Scenario	On-Chain Needed?	Why
Internal dev agents	Optional	Internal trust is sufficient
Financial transactions	Recommended	Regulatory audit trail
Legal/compliance	Recommended	Tamper-proof public timestamp
Agent marketplace	Recommended	Public verifiable reputation
Healthcare/medical	Recommended	Patient safety records

Frequently Asked Questions

Why use blockchain for AI agent trust?

Blockchain provides permanent, public, independently verifiable timestamps. ATLAST anchors Merkle roots on Base via EAS, creating an immutable public record.

Does ATLAST require blockchain?

No. Blockchain anchoring is completely optional. Evidence chains are fully valid without it. On-chain adds extra verifiability for high-stakes scenarios.

What are the gas costs?

ATLAST batches evidence records into Merkle trees and anchors only the root hash. A single on-chain transaction covers thousands of evidence records, keeping costs to fractions of a cent per record on Base L2.

Add On-Chain Trust to Your Agent

Optional blockchain anchoring for maximum verifiability. Or start with off-chain — it's still tamper-proof.

Get Started with ATLAST →