diff --git a/config.json b/config.json
index 1dc843d..bfde8e1 100644
--- a/config.json
+++ b/config.json
@@ -7,6 +7,7 @@
     "Lox": "127.0.0.1:8002"
     },
     "extra_infos_base_url": "https://collector.torproject.org/recent/bridge-descriptors/extra-infos/",
+    "confidence": 0.95,
     "port": 8003,
     "require_bridge_token": false,
     "updater_schedule": "* * 22 * * * *"
diff --git a/src/analyzer.rs b/src/analyzer.rs
index a3eba6a..74e799d 100644
--- a/src/analyzer.rs
+++ b/src/analyzer.rs
@@ -3,14 +3,14 @@ use std::collections::HashSet;
 
 /// Provides a function for predicting which countries block this bridge
 pub trait Analyzer {
-    fn blocked_in(&self, bridge_info: &BridgeInfo) -> HashSet<String>;
+    fn blocked_in(&self, bridge_info: &BridgeInfo, confidence: f64) -> HashSet<String>;
 }
 
 pub struct ExampleAnalyzer {}
 
 /// Dummy example which just tells us about blockages we already know about
 impl Analyzer for ExampleAnalyzer {
-    fn blocked_in(&self, bridge_info: &BridgeInfo) -> HashSet<String> {
+    fn blocked_in(&self, bridge_info: &BridgeInfo, confidence: f64) -> HashSet<String> {
         let mut blocked_in = HashSet::<String>::new();
         for (country, info) in &bridge_info.info_by_country {
             if info.blocked {
diff --git a/src/bin/server.rs b/src/bin/server.rs
index 24b9718..70fdf69 100644
--- a/src/bin/server.rs
+++ b/src/bin/server.rs
@@ -41,6 +41,8 @@ pub struct Config {
     // map of distributor name to IP:port to contact it
     pub distributors: BTreeMap<BridgeDistributor, String>,
     extra_infos_base_url: String,
+    // confidence required to consider a bridge blocked
+    confidence: f64,
     //require_bridge_token: bool,
     port: u16,
     updater_schedule: String,
@@ -64,13 +66,14 @@ async fn update_daily_info(
     db: &Db,
     distributors: &BTreeMap<BridgeDistributor, String>,
     extra_infos_base_url: &str,
+    confidence: f64,
 ) {
     update_extra_infos(&db, &extra_infos_base_url)
         .await
         .unwrap();
     update_negative_reports(&db, &distributors).await;
     update_positive_reports(&db, &distributors).await;
-    let new_blockages = guess_blockages(&db, &analyzer::ExampleAnalyzer {});
+    let new_blockages = guess_blockages(&db, &analyzer::ExampleAnalyzer {}, confidence);
     report_blockages(&distributors, new_blockages).await;
 }
 
@@ -82,11 +85,12 @@ async fn create_context_manager(
     db_config: DbConfig,
     distributors: BTreeMap<BridgeDistributor, String>,
     extra_infos_base_url: &str,
+    confidence: f64,
     context_rx: mpsc::Receiver<Command>,
     mut kill: broadcast::Receiver<()>,
 ) {
     tokio::select! {
-        create_context = context_manager(db_config, distributors, extra_infos_base_url, context_rx) => create_context,
+        create_context = context_manager(db_config, distributors, extra_infos_base_url, confidence, context_rx) => create_context,
         _ = kill.recv() => {println!("Shut down manager");},
     }
 }
@@ -95,6 +99,7 @@ async fn context_manager(
     db_config: DbConfig,
     distributors: BTreeMap<BridgeDistributor, String>,
     extra_infos_base_url: &str,
+    confidence: f64,
     mut context_rx: mpsc::Receiver<Command>,
 ) {
     let db: Db = sled::open(&db_config.db_path).unwrap();
@@ -115,7 +120,7 @@ async fn context_manager(
                 println!("Shutdown Sent.");
             }
             Update {} => {
-                update_daily_info(&db, &distributors, &extra_infos_base_url).await;
+                update_daily_info(&db, &distributors, &extra_infos_base_url, confidence).await;
             }
         }
     }
@@ -182,6 +187,7 @@ async fn main() {
             config.db,
             config.distributors,
             &config.extra_infos_base_url,
+            config.confidence,
             request_rx,
             kill,
         )
diff --git a/src/lib.rs b/src/lib.rs
index 02666ce..ccfa862 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -564,7 +564,11 @@ pub async fn update_positive_reports(db: &Db, distributors: &BTreeMap<BridgeDist
 
 /// Guess which countries block a bridge. This function returns a map of new
 /// blockages (fingerprint : set of countries which block the bridge)
-pub fn guess_blockages(db: &Db, analyzer: &dyn Analyzer) -> HashMap<[u8; 20], HashSet<String>> {
+pub fn guess_blockages(
+    db: &Db,
+    analyzer: &dyn Analyzer,
+    confidence: f64,
+) -> HashMap<[u8; 20], HashSet<String>> {
     // Map of bridge fingerprint to set of countries which newly block it
     let mut blockages = HashMap::<[u8; 20], HashSet<String>>::new();
 
@@ -579,7 +583,7 @@ pub fn guess_blockages(db: &Db, analyzer: &dyn Analyzer) -> HashMap<[u8; 20], Ha
         let mut bridge_info: BridgeInfo =
             bincode::deserialize(&db.get(fingerprint).unwrap().unwrap()).unwrap();
         let mut new_blockages = HashSet::<String>::new();
-        let blocked_in = analyzer.blocked_in(&bridge_info);
+        let blocked_in = analyzer.blocked_in(&bridge_info, confidence);
         for country in blocked_in {
             let bridge_country_info = bridge_info.info_by_country.get_mut(&country).unwrap();
             if !bridge_country_info.blocked {