Attestations

Ethereum Attestation Service

SESHAT uses EAS (Ethereum Attestation Service) on Base L2 for creating immutable attestations. EAS is an open-source protocol for making, verifying, and revoking on-chain attestations.

Why Base L2?

Factor	Ethereum L1	Base L2
Cost per attestation	~€5-50	~€0.07
Confirmation time	~15 min	~2 sec
Security	Native	Inherited from L1
Decentralization	High	Medium

Base provides the best balance of cost, speed, and security for IP protection attestations.

Schema

SESHAT uses a custom EAS schema:

bytes32 projectId,      // Keccak256 of project name
string category,        // "research", "pr", "tag", "release", "bundle"
bytes32 fingerprint,    // SHA-512 hash of content
bytes32 treeHash,       // Git tree hash (for code)
string ref,             // Reference (file path, PR number, tag name)
uint256 effortHours     // R&D hours (×100 for decimals)

Attestation Lifecycle

1. Content Created

   You write research notes or code

2. Hash Generated

   SHA-512 fingerprint computed locally

3. Transaction Signed

   Your wallet signs the attestation

4. On-Chain Recording

   Attestation stored on Base L2

5. Local Ledger Update

   SQLite records the attestation for querying

Verification

Every attestation can be verified:

https://base.easscan.org/attestation/view/{EAS_UID}

This shows:

• Schema used
• Attester address (your wallet)
• Timestamp
• Decoded data (fingerprint, project, etc.)

Cost Estimation

Operation	Gas	Cost (ETH)	Cost (EUR)
Single attestation	~50,000	~0.00003	~€0.07
Batch (10)	~200,000	~0.0003	~€0.70

With 0.01 ETH (~€20), you can make ~140 attestations. €10 covers approximately one year of active development.

Astuce

The status tool shows your remaining attestation capacity based on wallet balance.