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Sovereign Infrastructure for Global Nations

Building the Software-Defined Government

Sign Foundation ยท Whitepaper, revision 3.3.33 (October 2026)

Abstract

Every government is becoming a software company. The open questions are whose software it runs and who holds the keys. Most governments still build that software agency by agency, with separate databases, separate logins, and residents repeating the same facts at every counter. Blockchain and AI could join these systems, but governments have moved cautiously: they worry about regulatory control, privacy, and operational sovereignty. Early blockchain designs also forced a choice between transparency and privacy, and between innovation and control. The SIGN Stack (Sovereign Infrastructure for Global Nations) answers these concerns with sovereign Digital Public Infrastructure (DPI): shared rails for identity, payments, and data exchange, plus governed AI, all kept under national authority and connected to the global digital economy through open standards.

The stack is built from four building blocks: digital identity and credentials, sovereign digital money, public services, and sovereign artificial intelligence, which runs on national infrastructure and works across the other three. Most digital services build on digital identity, and reliable identity makes inclusion and digital service delivery far easier to reach at scale. It combines four elements:

  • Sign ID, a National Digital Identity system that gives citizens sovereignty over their data through Verifiable Credentials, digitally signed records that the holder keeps and any authorized service can check, with Sign Protocol attestations for facts that a ledger or smart contract must verify.

  • Sovereign digital money on two ledgers for money that carries its purpose: smart contracts on a public Layer 1 network such as Ethereum, and Sign CBDC, a central bank digital currency platform on Hyperledger Fabric-X that only approved institutions can join.

  • A public services platform through which residents and businesses find, apply for, pay for, and track government services.

  • Sign AI, an AI workforce that answers to officials and works under auditable workflow controls.

Sign DataHub joins them as a shared data and evidence layer through which departments exchange standardized data: collect once, share with proof.

Part I presents the SIGN Stack, with a chapter on Sign DataHub and one for each building block, and reference architectures for national identity, the CBDC platform and its privacy, custody, and programmability models, the public services platform, and governed AI. Part II puts the stack to work in three national programs: national payments, real-world asset tokenization, and digital free zones. It also describes services that governments could build next, such as verifiable remote voting and universal basic income. Part III shows how regulators can supervise the digital economy in real time from the same infrastructure, how a government deploys and owns the stack, including our preferred model, in which we hand over the source code and the skills to run it, and what it gains. An appendix gives the specifications of each component and the basis of every performance figure. Throughout, distributed ledger technology and AI must pass one test: they strengthen what the state controls, and they connect nations through open standards without any of them giving up control.

Contents

Part I: The SIGN Stack

Part II: Putting the Stack to Work

Part I described the infrastructure. Part II shows what a government can do with it. Three national programs combine the building blocks: national payments, real-world asset tokenization, and digital free zones. New services follow that only a software-defined government could offer.

Part III: Oversight, Delivery, and Impact

Appendix

Developers

The technical documentation for Sign Protocol, with its smart contracts, SDKs, APIs and tutorials, is in the Sign Protocol Developer Docs.