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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.

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Why Base L2?

FactorEthereum L1Base L2
Cost per attestation~$5-50~$0.001
Confirmation time~15 min~2 sec
SecurityNativeInherited from L1
DecentralizationHighMedium
Base provides the best balance of cost, speed, and security for high-volume attestations.

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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)

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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

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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.)

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Cost Estimation

OperationGasCost (ETH)Cost (USD)
Single attestation~80,0000.00001~$0.002
Batch (10)~400,0000.00005~$0.01
With 0.01 ETH (~$20), you can make ~1,000 attestations.
The status tool shows your remaining attestation capacity based on wallet balance.