NearID guide

BLE vs GPS, QR codes, NFC, and badges for presence verification.

No method proves everything. The right choice depends on whether you need approximate location, a deliberate check-in, point-of-entry possession, or a continuous receiver-backed signal—and how much friction, hardware, and privacy exposure the workflow can tolerate.

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Method comparison

GPS or geofencing

Strength

Broad outdoor area checks with no fixed receiver infrastructure.

Limitation

Coordinates can be spoofed, indoor accuracy varies, and continuous location collection raises privacy concerns.

Good fit

Large outdoor zones where approximate location is sufficient.

QR codes

Strength

Low cost and easy to deploy using existing phone cameras.

Limitation

Static codes can be photographed or shared unless paired with rotation, identity, or another control.

Good fit

Low-risk, user-initiated check-ins and temporary workflows.

NFC or badges

Strength

Fast, familiar tap or entry experience with established hardware options.

Limitation

A card or tag can be handed to someone else; a tap proves the credential was present, not necessarily its owner.

Good fit

Door access, point-of-entry workflows, and environments with managed credentials.

BLE receiver verification

Strength

Passive, time-bounded observation by organization-managed on-site receivers without GPS presence data.

Limitation

Signal strength is not exact distance and sophisticated relay attacks cannot be eliminated by passive radio alone.

Good fit

Ongoing indoor or site presence where software needs a receiver-backed signal.

Why combine controls?

Presence confidence comes from a chain, not a single sensor.

A useful deployment combines device linking, rotating credentials, trusted receiver ownership, time-window validation, anti-replay checks, operational monitoring, and a clear downstream policy.

Start with the decision

Define the business action and the cost of a false acceptance or rejection.

Match assurance to risk

Higher-risk actions may need identity, human review, or another independent factor.

Measure the real site

Walls, crowds, receiver placement, devices, and radio interference affect BLE behavior.

NearID's role

Receiver-backed BLE presence for existing systems.

NearID focuses on privacy-aware, time-bounded physical-presence signals. It does not claim exact distance, legal identity, or perfect resistance to every radio relay. Customer systems keep ownership of the final decision.

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