Enter
Tap into an event, building or room when your access is valid.
Approach → request → enterSelective Identity Gateway Network
SIGN
A permissions layer
for the physical world.
PeopleThingsPlaces
What can you do with a SIGN?
01UsesWhat can I do with SIGN?
02What is SIGN?The physical permissions layer.
03Who can use it?People. Things. Places.
04Safety + PrivacyYou decide what gets shared.
05Building SIGNFollow the prototype.
01 / Uses
One gesture.
Only what you allow.
Connect
Share only the contact or identity information you choose.
Choose → share → connectReturn
Put a SIGN on something you own. A finder can reach you without seeing private details.
Find → tap → returnRequest
Ask a person, place or object for an interaction it makes available.
Ask → review → allowProve
Present the credential a moment requires—without revealing everything behind it.
Present → verify → continue
Wear SIGN. Approach something. Make a request. Share selectively. Gain access.
02 / What is SIGN?
A physical point of permission.
SIGN is a proposed way for people, places and things to expose specific interactions—without exposing everything else.
Instead of treating identity as a profile you hand over, SIGN treats each encounter as a request: what is being asked, what is required, and what you choose to share.
Prototype direction
Starting with NFC: a simple, physical tap between a SIGN and a compatible phone or reader.
03 / Who can use it?
People.
Things.
Places.
People
Carry access, contact and credentials. Decide what leaves your hand.
Things
Give an object a controlled way to be identified, returned or interacted with.
Places
Define what is available here, who may enter, and what proof is needed.
04 / Safety + Privacy
Permission should be legible.
The request should tell you what is being asked before anything is shared.
SIGN is early. Its privacy model and security architecture are still being designed and tested. The intent is explicit, per-interaction choice—not invisible collection and not blanket access.
05 / Building SIGN
NFC first.
AI-mediated over time.
Physical, wearable, manufacturable.
The current prototype begins with NFC because the first interaction should be simple and believable: bring a SIGN near a device and open a permission request.
AI-mediated permission management is a future direction. The idea is for requests to be understood and managed in natural language—but that capability is not part of the current prototype.
NowNFC interaction prototype
NextPermission rules + interface tests
LaterAI-mediated request management
Building in public