6 ms·
As an example, the one used in Singapore is open source and implements a public standard (bluetrace.io), so you don't even need to trust them, you can check it
by 9nGQluzmnq3M 6y ago
As an example, the one used in Singapore is open source and implements a public standard (bluetrace.io), so you don't even need to trust them, you can check it yourself. And before you ask, yes, people have decompiled the app to verify this.