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.
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
Core primitives
Schemas
Schemas define:
data structure,
field types,
validation rules,
versioning.
They ensure attestations are machine-readable and interoperable.
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.
Indexing & querying
SignScan aggregates attestations across:
chains,
storage layers,
execution environments.
Builders can query via:
REST
GraphQL
SDKs
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
Who should use it
protocol developers
government platform teams
auditors and compliance systems
enterprise integrators
Where to go next
Developer docs: For Builders
Products:
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