Proof Chain

What is a Proof Chain?

A proof chain is a sequence of cryptographically linked attestations that prove the timeline of your creative work. Each attestation references previous ones, creating an unbreakable chain of evidence.

graph TD
    A[Research Note 1] -->|SHA-512| B[Attestation 1]
    C[Research Note 2] -->|SHA-512| D[Attestation 2]
    E[PR #42] -->|Tree Hash| F[Attestation 3]
    G[Tag v1.0.0] -->|Tree Hash| H[Attestation 4]
    B --> I[Merkle Root]
    D --> I
    F --> I
    H --> I
    I --> J[Bundle Attestation]

Components

Fingerprints

Every piece of content is hashed with SHA-512:

SHA-512("Your research content...")
  → "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855..."

This fingerprint is:

Unique: Different content = different hash
Deterministic: Same content = same hash always
One-way: Cannot reverse to original content

Attestations

Each fingerprint is attested on Base L2 via EAS:

{
  "schema": "0x...",
  "data": {
    "projectId": "my-project",
    "category": "research",
    "fingerprint": "sha512:e3b0c44...",
    "treeHash": "sha512:...",
    "ref": "research/note.md",
    "effortHours": 250
  }
}

Merkle Root

All attestations combine into a Merkle tree:

        Merkle Root
           /    \
      Hash(A+B)  Hash(C+D)
       /    \     /    \
      A      B   C      D

The root proves all attestations without revealing individual content.

Verification

Anyone can verify your proof chain:

Find the attestation on base.easscan.org
Check the timestamp - blockchain provides authoritative time
Verify the fingerprint - hash the content yourself
Follow the chain - each attestation links to the project

Legal Strength

The proof chain provides:

Evidence Type	Traditional	SESHAT
Timestamp	Self-reported	Blockchain-verified
Content proof	Witness testimony	Cryptographic hash
Tamper evidence	None	Immutable ledger
Third-party verification	Notary ($$)	Public blockchain (free)