Physical presence validation through use of time-restricted secure beacon devices

A method comprising:

• broadcasting a plurality of packets from a transmitter device, wherein each of said packets indicates a time of broadcast;
• receiving the plurality of packets at a receiver device configured to receive and convey packets;
• receiving a given packet of the plurality of packets from the receiver device at a destination device;
• determining a first indication of time corresponding to receipt of the given packet;
• extracting a second indication of time from the given packet that corresponds to broadcast of the given packet from the transmitter device;
• determining a first difference between the first indication of time and the second indication of time;
• and
• in response to determining the first difference exceeds an expected latency, sending a response to the receiver device indicating the given packet is invalid, wherein the expected latency is based at least in part on crowdsourcing information from a location of the transmitter device.

A non-transitory computer readable storage medium comprising program instructions, wherein the program instructions are executable by a processor to:

• broadcast a plurality of packets from a transmitter device, wherein each of said packets indicates a time of broadcast;
• receive the plurality of packets at a receiver device configured to receive and convey packets;
• receive a given packet of the plurality of packets from the receiver device at a destination device;
• determine a first indication of time corresponding to receipt of the given packet;
• extract a second indication of time from the given packet that corresponds to broadcast of the given packet from the transmitter device;
• determine a first difference between the first indication of time and the second indication of time;
• and
• in response to determining the first difference exceeds an expected latency, send a response to the receiver device indicating the given packet is invalid, wherein the expected latency is based at least in part on crowdsourcing information from a location of the transmitter device.