Get attestation unit id from a specific attested value.
const params = {
attestor_address: 'H5EZTQE7ABFH27AUDTQFMZIALANK6RBG',
field: 'email',
value: 'fabien@bonustrack.co'
};
client.request('light/get_attestation', params, function(err, result) {
console.log(result);
});
7SEJqVRpog8Ezn5A3PSDX+h3iIYMfJaUsozoUlrsm+o=
