Sign Protocol (Evidence Layer)

The core evidence, attestation, and verification layer powering the S.I.G.N. stack.

What is Sign Protocol?

Sign Protocol is the cryptographic evidence layer of the S.I.G.N. stack.

It enables governments, institutions, and developers to:

• define structured schemas,

• issue verifiable attestations,

• anchor evidence across chains and systems,

• query, verify, and audit data reliably.

Sign Protocol is infrastructure, not an application.

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What Sign Protocol does

• Standardizes how facts are expressed (schemas)

• Cryptographically binds data to issuers and subjects

• Enables selective disclosure and privacy

• Supports public, private, and hybrid attestations

• Provides immutable audit references

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Core primitives

Schemas

Schemas define:

• data structure,

• field types,

• validation rules,

• versioning.

They ensure attestations are machine-readable and interoperable.

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Attestations

Attestations are signed statements such as:

• “This citizen is eligible”

• “This payment was executed”

• “This entity passed compliance”

• “This program followed rule version X”

They can be:

• public,

• private,

• ZK-based,

• cross-chain.

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Indexing & querying

SignScan aggregates attestations across:

• chains,

• storage layers,

• execution environments.

Builders can query via:

• REST

• GraphQL

• SDKs

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Where Sign Protocol fits

Sign Protocol underpins:

• New ID System (identity & credentials)

• New Money System (payment evidence)

• New Capital System (distribution & audits)

• Products like EthSign and TokenTable

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Who should use it

• protocol developers

• government platform teams

• auditors and compliance systems

• enterprise integrators

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Where to go next

• Developer docs: For Builders

• Use cases:

  • New ID System

  • New Money System

  • New Capital System

• Products:

  • EthSign

  • TokenTable