diff --git a/backend/Cargo.lock b/backend/Cargo.lock
index bfb5c24..36ffa80 100644
--- a/backend/Cargo.lock
+++ b/backend/Cargo.lock
@@ -1693,6 +1693,7 @@ dependencies = [
  "clap",
  "ctor",
  "fnv",
+ "hex",
  "log",
  "num-traits",
  "parking_lot",
diff --git a/backend/Cargo.toml b/backend/Cargo.toml
index 6a1c8c1..739d66b 100644
--- a/backend/Cargo.toml
+++ b/backend/Cargo.toml
@@ -13,6 +13,7 @@ actix-http = "3.0.0-beta.4"
 bytes = "1.0.1"
 chrono = { version = "0.4", features = ["serde"] }
 fnv = "1.0.7"
+hex = "0.4.3"
 serde = { version = "1.0", features = ["derive"] }
 serde_json = { version = "1.0", features = ["raw_value"] }
 primitive-types = { version = "0.9.0", features = ["serde"] }
diff --git a/backend/src/aggregator.rs b/backend/src/aggregator.rs
index 205899d..e34a9ba 100644
--- a/backend/src/aggregator.rs
+++ b/backend/src/aggregator.rs
@@ -1,29 +1,32 @@
-use std::collections::{HashMap, HashSet};
 use actix::prelude::*;
-use actix_web_actors::ws::{CloseReason, CloseCode};
+use actix_web_actors::ws::{CloseCode, CloseReason};
 use ctor::ctor;
+use std::collections::{HashMap, HashSet};
 
-use crate::node::connector::{Mute, NodeConnector};
-use crate::feed::connector::{FeedConnector, Connected, FeedId};
-use crate::util::DenseMap;
+use crate::chain::{self, Chain, ChainId, GetNodeNetworkState, Label};
+use crate::feed::connector::{Connected, FeedConnector, FeedId};
 use crate::feed::{self, FeedMessageSerializer};
-use crate::chain::{self, Chain, ChainId, Label, GetNodeNetworkState};
+use crate::node::connector::{Mute, NodeConnector};
 use crate::types::{ConnId, NodeDetails, NodeId};
+use crate::util::{DenseMap, Hash};
 
 pub struct Aggregator {
+    genesis_hashes: HashMap<Hash, ChainId>,
     labels: HashMap<Label, ChainId>,
-    networks: HashMap<Label, ChainId>,
     chains: DenseMap<ChainEntry>,
     feeds: DenseMap<Addr<FeedConnector>>,
     serializer: FeedMessageSerializer,
     /// Denylist for networks we do not want to allow connecting.
-    denylist: HashSet<String>
+    denylist: HashSet<String>,
 }
 
 pub struct ChainEntry {
+    /// Address to the `Chain` agent
     addr: Addr<Chain>,
+    /// Genesis [`Hash`] of the chain
+    genesis_hash: Hash,
+    /// String name of the chain
     label: Label,
-    network_id: Option<Label>,
     /// Node count
     nodes: usize,
     /// Maximum allowed nodes
@@ -48,8 +51,8 @@ const THIRD_PARTY_NETWORKS_MAX_NODES: usize = 500;
 impl Aggregator {
     pub fn new(denylist: HashSet<String>) -> Self {
         Aggregator {
+            genesis_hashes: HashMap::new(),
             labels: HashMap::new(),
-            networks: HashMap::new(),
             chains: DenseMap::new(),
             feeds: DenseMap::new(),
             serializer: FeedMessageSerializer::new(),
@@ -61,10 +64,11 @@ impl Aggregator {
     /// or the address is disconnected (actor dropped), create a new one.
     pub fn lazy_chain(
         &mut self,
+        genesis_hash: Hash,
         label: &str,
         ctx: &mut <Self as Actor>::Context,
     ) -> ChainId {
-        let cid = match self.get_chain_id(label, None.as_ref()) {
+        let cid = match self.genesis_hashes.get(&genesis_hash).copied() {
             Some(cid) => cid,
             None => {
                 self.serializer.push(feed::AddedChain(&label, 1));
@@ -72,17 +76,16 @@ impl Aggregator {
                 let addr = ctx.address();
                 let max_nodes = max_nodes(label);
                 let label: Label = label.into();
-                let cid = self.chains.add_with(|cid| {
-                    ChainEntry {
-                        addr: Chain::new(cid, addr, label.clone()).start(),
-                        label: label.clone(),
-                        network_id: None, // TODO: this doesn't seem to be used anywhere. Can it be removed?
-                        nodes: 1,
-                        max_nodes,
-                    }
+                let cid = self.chains.add_with(|cid| ChainEntry {
+                    addr: Chain::new(cid, addr, label.clone()).start(),
+                    genesis_hash,
+                    label: label.clone(),
+                    nodes: 1,
+                    max_nodes,
                 });
 
                 self.labels.insert(label, cid);
+                self.genesis_hashes.insert(genesis_hash, cid);
 
                 self.broadcast();
 
@@ -93,20 +96,11 @@ impl Aggregator {
         cid
     }
 
-    fn get_chain_id(&self, label: &str, network: Option<&Label>) -> Option<ChainId> {
-        let labels = &self.labels;
-        let networks = &self.networks;
-
-        if let Some(network) = network {
-            networks.get(&**network).or_else(|| labels.get(label)).copied()
-        } else {
-            labels.get(label).copied()
-        }
-    }
-
     fn get_chain(&mut self, label: &str) -> Option<&mut ChainEntry> {
         let chains = &mut self.chains;
-        self.labels.get(label).and_then(move |&cid| chains.get_mut(cid))
+        self.labels
+            .get(label)
+            .and_then(move |&cid| chains.get_mut(cid))
     }
 
     fn broadcast(&mut self) {
@@ -128,6 +122,8 @@ impl Actor for Aggregator {
 pub struct AddNode {
     /// Details of the node being added to the aggregator
     pub node: NodeDetails,
+    /// Genesis [`Hash`] of the chain the node is being added to.
+    pub genesis_hash: Hash,
     /// Connection id used by the node connector for multiplexing parachains
     pub conn_id: ConnId,
     /// Address of the NodeConnector actor
@@ -199,15 +195,26 @@ impl Handler<AddNode> for Aggregator {
         if self.denylist.contains(&*msg.node.chain) {
             log::warn!(target: "Aggregator::AddNode", "'{}' is on the denylist.", msg.node.chain);
             let AddNode { node_connector, .. } = msg;
-            let reason = CloseReason{ code: CloseCode::Abnormal, description: Some("Denied".into()) };
+            let reason = CloseReason {
+                code: CloseCode::Abnormal,
+                description: Some("Denied".into()),
+            };
             node_connector.do_send(Mute { reason });
             return;
         }
-        let AddNode { node, conn_id, node_connector } = msg;
+        let AddNode {
+            node,
+            genesis_hash,
+            conn_id,
+            node_connector,
+        } = msg;
         log::trace!(target: "Aggregator::AddNode", "New node connected. Chain '{}'", node.chain);
 
-        let cid = self.lazy_chain(&node.chain, ctx);
-        let chain = self.chains.get_mut(cid).expect("Entry just created above; qed");
+        let cid = self.lazy_chain(genesis_hash, &node.chain, ctx);
+        let chain = self
+            .chains
+            .get_mut(cid)
+            .expect("Entry just created above; qed");
         if chain.nodes < chain.max_nodes {
             chain.addr.do_send(chain::AddNode {
                 node,
@@ -216,7 +223,10 @@ impl Handler<AddNode> for Aggregator {
             });
         } else {
             log::warn!(target: "Aggregator::AddNode", "Chain {} is over quota ({})", chain.label, chain.max_nodes);
-            let reason = CloseReason{ code: CloseCode::Again, description: Some("Overquota".into()) };
+            let reason = CloseReason {
+                code: CloseCode::Again,
+                description: Some("Overquota".into()),
+            };
             node_connector.do_send(Mute { reason });
         }
     }
@@ -230,16 +240,12 @@ impl Handler<DropChain> for Aggregator {
 
         if let Some(entry) = self.chains.remove(cid) {
             let label = &entry.label;
+            self.genesis_hashes.remove(&entry.genesis_hash);
             self.labels.remove(label);
-            if let Some(network) = entry.network_id {
-                self.networks.remove(&network);
-            }
-
             self.serializer.push(feed::RemovedChain(label));
             log::info!("Dropped chain [{}] from the aggregator", label);
             self.broadcast();
         }
-
     }
 }
 
@@ -323,7 +329,8 @@ impl Handler<Connect> for Aggregator {
 
         // TODO: keep track on number of nodes connected to each chain
         for (_, entry) in self.chains.iter() {
-            self.serializer.push(feed::AddedChain(&entry.label, entry.nodes));
+            self.serializer
+                .push(feed::AddedChain(&entry.label, entry.nodes));
         }
 
         if let Some(msg) = self.serializer.finalize() {
diff --git a/backend/src/chain.rs b/backend/src/chain.rs
index 1db3e11..b4a1be1 100644
--- a/backend/src/chain.rs
+++ b/backend/src/chain.rs
@@ -1,15 +1,19 @@
-use std::collections::HashMap;
 use actix::prelude::*;
-use std::sync::Arc;
 use bytes::Bytes;
 use rustc_hash::FxHashMap;
+use std::collections::HashMap;
+use std::sync::Arc;
 
-use crate::aggregator::{Aggregator, DropChain, RenameChain, NodeCount};
-use crate::node::{Node, connector::{Initialize, NodeConnector}, message::{NodeMessage, Payload}};
-use crate::feed::connector::{FeedId, FeedConnector, Subscribed, Unsubscribed};
+use crate::aggregator::{Aggregator, DropChain, NodeCount, RenameChain};
+use crate::feed::connector::{FeedConnector, FeedId, Subscribed, Unsubscribed};
 use crate::feed::{self, FeedMessageSerializer};
-use crate::util::{DenseMap, NumStats, now};
-use crate::types::{ConnId, NodeId, NodeDetails, NodeLocation, Block, Timestamp, BlockNumber};
+use crate::node::{
+    connector::{Initialize, NodeConnector},
+    message::Payload,
+    Node,
+};
+use crate::types::{Block, BlockNumber, ConnId, NodeDetails, NodeId, NodeLocation, Timestamp};
+use crate::util::{now, DenseMap, NumStats};
 
 const STALE_TIMEOUT: u64 = 2 * 60 * 1000; // 2 minutes
 
@@ -70,11 +74,11 @@ impl Chain {
             Some(count) => {
                 *count += 1;
                 *count
-            },
+            }
             None => {
                 self.labels.insert(label.into(), 1);
                 1
-            },
+            }
         };
 
         if &*self.label.0 == label {
@@ -106,7 +110,8 @@ impl Chain {
     fn rename(&mut self, label: Label, count: usize) {
         self.label = (label, count);
 
-        self.aggregator.do_send(RenameChain(self.cid, self.label.0.clone()));
+        self.aggregator
+            .do_send(RenameChain(self.cid, self.label.0.clone()));
     }
 
     fn broadcast(&mut self) {
@@ -128,7 +133,8 @@ impl Chain {
     /// Triggered when the number of nodes in this chain has changed, Aggregator will
     /// propagate new counts to all connected feeds
     fn update_count(&self) {
-        self.aggregator.do_send(NodeCount(self.cid, self.nodes.len()));
+        self.aggregator
+            .do_send(NodeCount(self.cid, self.nodes.len()));
     }
 
     /// Check if the chain is stale (has not received a new best block in a while).
@@ -170,8 +176,13 @@ impl Chain {
             self.block_times.reset();
             self.timestamp = timestamp;
 
-            self.serializer.push(feed::BestBlock(self.best.height, timestamp.unwrap_or(now), None));
-            self.serializer.push(feed::BestFinalized(finalized.height, finalized.hash));
+            self.serializer.push(feed::BestBlock(
+                self.best.height,
+                timestamp.unwrap_or(now),
+                None,
+            ));
+            self.serializer
+                .push(feed::BestFinalized(finalized.height, finalized.hash));
         }
     }
 }
@@ -205,8 +216,8 @@ pub struct AddNode {
 #[rtype(result = "()")]
 pub struct UpdateNode {
     pub nid: NodeId,
-    pub msg: NodeMessage,
     pub raw: Option<Bytes>,
+    pub payload: Payload,
 }
 
 /// Message sent from the NodeConnector to the Chain when the connector disconnects
@@ -250,14 +261,25 @@ impl Handler<AddNode> for Chain {
     type Result = ();
 
     fn handle(&mut self, msg: AddNode, ctx: &mut Self::Context) {
-        let AddNode { node, conn_id, node_connector } = msg;
+        let AddNode {
+            node,
+            conn_id,
+            node_connector,
+        } = msg;
         log::trace!(target: "Chain::AddNode", "New node connected. Chain '{}', node count goes from {} to {}", node.chain, self.nodes.len(), self.nodes.len() + 1);
         self.increment_label_count(&node.chain);
 
         let nid = self.nodes.add(Node::new(node));
         let chain = ctx.address();
 
-        if node_connector.try_send(Initialize { nid, conn_id, chain }).is_err() {
+        if node_connector
+            .try_send(Initialize {
+                nid,
+                conn_id,
+                chain,
+            })
+            .is_err()
+        {
             self.nodes.remove(nid);
         } else if let Some(node) = self.nodes.get(nid) {
             self.serializer.push(feed::AddedNode(nid, node));
@@ -297,7 +319,11 @@ impl Chain {
                     self.average_block_time = Some(self.block_times.average());
                 }
                 self.timestamp = Some(now);
-                self.serializer.push(feed::BestBlock(self.best.height, now, self.average_block_time));
+                self.serializer.push(feed::BestBlock(
+                    self.best.height,
+                    now,
+                    self.average_block_time,
+                ));
                 propagation_time = Some(0);
             } else if block.height == self.best.height {
                 if let Some(timestamp) = self.timestamp {
@@ -316,14 +342,14 @@ impl Handler<UpdateNode> for Chain {
     type Result = ();
 
     fn handle(&mut self, msg: UpdateNode, _: &mut Self::Context) {
-        let UpdateNode { nid, msg, raw } = msg;
+        let UpdateNode { nid, payload, raw } = msg;
 
-        if let Some(block) = msg.payload().best_block() {
+        if let Some(block) = payload.best_block() {
             self.handle_block(block, nid);
         }
 
         if let Some(node) = self.nodes.get_mut(nid) {
-            match msg.payload() {
+            match payload {
                 Payload::SystemInterval(ref interval) => {
                     if interval.network_state.is_some() {
                         if let Some(raw) = raw {
@@ -354,49 +380,69 @@ impl Handler<UpdateNode> for Chain {
                     return;
                 }
                 Payload::AfgFinalized(finalized) => {
-                    if let Ok(finalized_number) = finalized.finalized_number.parse::<BlockNumber>() {
+                    if let Ok(finalized_number) = finalized.finalized_number.parse::<BlockNumber>()
+                    {
                         if let Some(addr) = node.details().validator.clone() {
-                            self.serializer.push(feed::AfgFinalized(addr, finalized_number,
-                                finalized.finalized_hash));
+                            self.serializer.push(feed::AfgFinalized(
+                                addr,
+                                finalized_number,
+                                finalized.finalized_hash,
+                            ));
                             self.broadcast_finality();
                         }
                     }
                     return;
                 }
                 Payload::AfgReceivedPrecommit(precommit) => {
-                    if let Ok(finalized_number) = precommit.received.target_number.parse::<BlockNumber>() {
+                    if let Ok(finalized_number) =
+                        precommit.received.target_number.parse::<BlockNumber>()
+                    {
                         if let Some(addr) = node.details().validator.clone() {
                             let voter = precommit.received.voter.clone();
-                            self.serializer.push(feed::AfgReceivedPrecommit(addr, finalized_number,
-                                precommit.received.target_hash, voter));
+                            self.serializer.push(feed::AfgReceivedPrecommit(
+                                addr,
+                                finalized_number,
+                                precommit.received.target_hash,
+                                voter,
+                            ));
                             self.broadcast_finality();
                         }
                     }
                     return;
                 }
                 Payload::AfgReceivedPrevote(prevote) => {
-                    if let Ok(finalized_number) = prevote.received.target_number.parse::<BlockNumber>() {
+                    if let Ok(finalized_number) =
+                        prevote.received.target_number.parse::<BlockNumber>()
+                    {
                         if let Some(addr) = node.details().validator.clone() {
                             let voter = prevote.received.voter.clone();
-                            self.serializer.push(feed::AfgReceivedPrevote(addr, finalized_number,
-                                prevote.received.target_hash, voter));
+                            self.serializer.push(feed::AfgReceivedPrevote(
+                                addr,
+                                finalized_number,
+                                prevote.received.target_hash,
+                                voter,
+                            ));
                             self.broadcast_finality();
                         }
                     }
                     return;
                 }
-                Payload::AfgReceivedCommit(_) => {
-                }
+                Payload::AfgReceivedCommit(_) => {}
                 _ => (),
             }
 
-            if let Some(block) = msg.payload().finalized_block() {
+            if let Some(block) = payload.finalized_block() {
                 if let Some(finalized) = node.update_finalized(block) {
-                    self.serializer.push(feed::FinalizedBlock(nid, finalized.height, finalized.hash));
+                    self.serializer.push(feed::FinalizedBlock(
+                        nid,
+                        finalized.height,
+                        finalized.hash,
+                    ));
 
                     if finalized.height > self.finalized.height {
                         self.finalized = *finalized;
-                        self.serializer.push(feed::BestFinalized(finalized.height, finalized.hash));
+                        self.serializer
+                            .push(feed::BestFinalized(finalized.height, finalized.hash));
                     }
                 }
             }
@@ -413,7 +459,12 @@ impl Handler<LocateNode> for Chain {
         let LocateNode { nid, location } = msg;
 
         if let Some(node) = self.nodes.get_mut(nid) {
-            self.serializer.push(feed::LocatedNode(nid, location.latitude, location.longitude, &location.city));
+            self.serializer.push(feed::LocatedNode(
+                nid,
+                location.latitude,
+                location.longitude,
+                &location.city,
+            ));
 
             node.update_location(location);
         }
@@ -457,10 +508,13 @@ impl Handler<Subscribe> for Chain {
             self.timestamp.unwrap_or(0),
             self.average_block_time,
         ));
-        self.serializer.push(feed::BestFinalized(self.finalized.height, self.finalized.hash));
+        self.serializer.push(feed::BestFinalized(
+            self.finalized.height,
+            self.finalized.hash,
+        ));
 
         for (idx, (nid, node)) in self.nodes.iter().enumerate() {
-            // Send subscribtion confirmation and chain head before doing all the nodes,
+            // Send subscription confirmation and chain head before doing all the nodes,
             // and continue sending batches of 32 nodes a time over the wire subsequently
             if idx % 32 == 0 {
                 if let Some(serialized) = self.serializer.finalize() {
@@ -469,7 +523,11 @@ impl Handler<Subscribe> for Chain {
             }
 
             self.serializer.push(feed::AddedNode(nid, node));
-            self.serializer.push(feed::FinalizedBlock(nid, node.finalized().height, node.finalized().hash));
+            self.serializer.push(feed::FinalizedBlock(
+                nid,
+                node.finalized().height,
+                node.finalized().hash,
+            ));
             if node.stale() {
                 self.serializer.push(feed::StaleNode(nid));
             }
diff --git a/backend/src/feed.rs b/backend/src/feed.rs
index 18e24f5..e1915f4 100644
--- a/backend/src/feed.rs
+++ b/backend/src/feed.rs
@@ -1,12 +1,13 @@
-use std::mem;
+use serde::ser::{SerializeTuple, Serializer};
 use serde::Serialize;
-use serde::ser::{Serializer, SerializeTuple};
+use std::mem;
 
-use serde_json::to_writer;
 use crate::node::Node;
 use crate::types::{
-    NodeId, NodeStats, NodeHardware, NodeIO, BlockNumber, BlockHash, BlockDetails, Timestamp, Address,
+    Address, BlockDetails, BlockHash, BlockNumber, NodeHardware, NodeIO, NodeId, NodeStats,
+    Timestamp,
 };
+use serde_json::to_writer;
 
 pub mod connector;
 
@@ -147,13 +148,29 @@ pub struct Pong<'a>(pub &'a str);
 pub struct AfgFinalized(pub Address, pub BlockNumber, pub BlockHash);
 
 #[derive(Serialize)]
-pub struct AfgReceivedPrevote(pub Address, pub BlockNumber, pub BlockHash, pub Option<Address>);
+pub struct AfgReceivedPrevote(
+    pub Address,
+    pub BlockNumber,
+    pub BlockHash,
+    pub Option<Address>,
+);
 
 #[derive(Serialize)]
-pub struct AfgReceivedPrecommit(pub Address, pub BlockNumber, pub BlockHash, pub Option<Address>);
+pub struct AfgReceivedPrecommit(
+    pub Address,
+    pub BlockNumber,
+    pub BlockHash,
+    pub Option<Address>,
+);
 
 #[derive(Serialize)]
-pub struct AfgAuthoritySet(pub Address, pub Address, pub Address, pub BlockNumber, pub BlockHash);
+pub struct AfgAuthoritySet(
+    pub Address,
+    pub Address,
+    pub Address,
+    pub BlockNumber,
+    pub BlockHash,
+);
 
 #[derive(Serialize)]
 pub struct StaleNode(pub NodeId);
diff --git a/backend/src/feed/connector.rs b/backend/src/feed/connector.rs
index e58fc2a..926a7f9 100644
--- a/backend/src/feed/connector.rs
+++ b/backend/src/feed/connector.rs
@@ -1,11 +1,11 @@
-use std::time::{Duration, Instant};
-use bytes::Bytes;
-use actix::prelude::*;
-use actix_web_actors::ws;
-use crate::aggregator::{Aggregator, Connect, Disconnect, Subscribe, SendFinality, NoMoreFinality};
+use crate::aggregator::{Aggregator, Connect, Disconnect, NoMoreFinality, SendFinality, Subscribe};
 use crate::chain::Unsubscribe;
 use crate::feed::{FeedMessageSerializer, Pong};
 use crate::util::fnv;
+use actix::prelude::*;
+use actix_web_actors::ws;
+use bytes::Bytes;
+use std::time::{Duration, Instant};
 
 pub type FeedId = usize;
 
@@ -26,7 +26,7 @@ pub struct FeedConnector {
     /// Chain actor address
     chain: Option<Recipient<Unsubscribe>>,
     /// FNV hash of the chain label, optimization to avoid double-subscribing
-    chain_hash: u64,
+    chain_label_hash: u64,
     /// Message serializer
     serializer: FeedMessageSerializer,
 }
@@ -58,7 +58,7 @@ impl FeedConnector {
             hb: Instant::now(),
             aggregator,
             chain: None,
-            chain_hash: 0,
+            chain_label_hash: 0,
             serializer: FeedMessageSerializer::new(),
         }
     }
@@ -79,24 +79,25 @@ impl FeedConnector {
         match cmd {
             "subscribe" => {
                 match fnv(payload) {
-                    hash if hash == self.chain_hash => return,
-                    hash => self.chain_hash = hash,
+                    hash if hash == self.chain_label_hash => return,
+                    hash => self.chain_label_hash = hash,
                 }
 
-                self.aggregator.send(Subscribe {
-                    chain: payload.into(),
-                    feed: ctx.address(),
-                })
-                .into_actor(self)
-                .then(|res, actor, _| {
-                    match res {
-                        Ok(true) => (),
-                        // Chain not found, reset hash
-                        _ => actor.chain_hash = 0,
-                    }
-                    async {}.into_actor(actor)
-                })
-                .wait(ctx);
+                self.aggregator
+                    .send(Subscribe {
+                        chain: payload.into(),
+                        feed: ctx.address(),
+                    })
+                    .into_actor(self)
+                    .then(|res, actor, _| {
+                        match res {
+                            Ok(true) => (),
+                            // Chain not found, reset hash
+                            _ => actor.chain_label_hash = 0,
+                        }
+                        async {}.into_actor(actor)
+                    })
+                    .wait(ctx);
             }
             "send-finality" => {
                 self.aggregator.do_send(SendFinality {
@@ -154,7 +155,7 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for FeedConnector {
             Ok(ws::Message::Text(text)) => {
                 if let Some(idx) = text.find(':') {
                     let cmd = &text[..idx];
-                    let payload = &text[idx+1..];
+                    let payload = &text[idx + 1..];
 
                     log::info!("New FEED message: {}", cmd);
 
@@ -191,7 +192,7 @@ impl Handler<Unsubscribed> for FeedConnector {
 
     fn handle(&mut self, _: Unsubscribed, _: &mut Self::Context) {
         self.chain = None;
-        self.chain_hash = 0;
+        self.chain_label_hash = 0;
     }
 }
 
diff --git a/backend/src/main.rs b/backend/src/main.rs
index 262e03b..c2a762e 100644
--- a/backend/src/main.rs
+++ b/backend/src/main.rs
@@ -1,10 +1,10 @@
-use std::net::Ipv4Addr;
 use std::collections::HashSet;
 use std::iter::FromIterator;
+use std::net::Ipv4Addr;
 
 use actix::prelude::*;
 use actix_http::ws::Codec;
-use actix_web::{web, get, middleware, App, Error, HttpRequest, HttpResponse, HttpServer};
+use actix_web::{get, middleware, web, App, Error, HttpRequest, HttpResponse, HttpServer};
 use actix_web_actors::ws;
 use clap::Clap;
 use simple_logger::SimpleLogger;
@@ -82,12 +82,15 @@ async fn node_route(
     aggregator: web::Data<Addr<Aggregator>>,
     locator: web::Data<Addr<Locator>>,
 ) -> Result<HttpResponse, Error> {
-    let ip = req.connection_info().realip_remote_addr().and_then(|mut addr| {
-        if let Some(port_idx) = addr.find(':') {
-            addr = &addr[..port_idx];
-        }
-        addr.parse::<Ipv4Addr>().ok()
-    });
+    let ip = req
+        .connection_info()
+        .realip_remote_addr()
+        .and_then(|mut addr| {
+            if let Some(port_idx) = addr.find(':') {
+                addr = &addr[..port_idx];
+            }
+            addr.parse::<Ipv4Addr>().ok()
+        });
 
     let mut res = ws::handshake(&req)?;
     let aggregator = aggregator.get_ref().clone();
@@ -125,16 +128,21 @@ async fn state_route(
     let res = match aggregator.send(GetNetworkState(chain, nid)).await {
         Ok(Some(res)) => res.await,
         Ok(None) => Ok(None),
-        Err(error) => Err(error)
+        Err(error) => Err(error),
     };
 
     match res {
         Ok(Some(body)) => {
-            HttpResponse::Ok().content_type("application/json").body(body).await
-        },
+            HttpResponse::Ok()
+                .content_type("application/json")
+                .body(body)
+                .await
+        }
         Ok(None) => {
-            HttpResponse::Ok().body("Node has disconnected or has not submitted its network state yet").await
-        },
+            HttpResponse::Ok()
+                .body("Node has disconnected or has not submitted its network state yet")
+                .await
+        }
         Err(error) => {
             log::error!("Network state mailbox error: {:?}", error);
 
@@ -151,7 +159,7 @@ async fn health(aggregator: web::Data<Addr<Aggregator>>) -> Result<HttpResponse,
             let body = format!("Connected chains: {}", count);
 
             HttpResponse::Ok().body(body).await
-        },
+        }
         Err(error) => {
             log::error!("Health check mailbox error: {:?}", error);
 
@@ -166,7 +174,10 @@ async fn health(aggregator: web::Data<Addr<Aggregator>>) -> Result<HttpResponse,
 async fn main() -> std::io::Result<()> {
     let opts = Opts::parse();
     let log_level = &opts.log_level;
-    SimpleLogger::new().with_level(log_level.into()).init().expect("Must be able to start a logger");
+    SimpleLogger::new()
+        .with_level(log_level.into())
+        .init()
+        .expect("Must be able to start a logger");
 
     let denylist = HashSet::from_iter(opts.denylist);
     let aggregator = Aggregator::new(denylist).start();
diff --git a/backend/src/node.rs b/backend/src/node.rs
index 0c61f46..23f3def 100644
--- a/backend/src/node.rs
+++ b/backend/src/node.rs
@@ -1,11 +1,14 @@
 use bytes::Bytes;
 use std::sync::Arc;
 
-use crate::types::{NodeId, NodeDetails, NodeStats, NodeIO, NodeHardware, NodeLocation, BlockDetails, Block, Timestamp};
+use crate::types::{
+    Block, BlockDetails, NodeDetails, NodeHardware, NodeIO, NodeId, NodeLocation, NodeStats,
+    Timestamp,
+};
 use crate::util::now;
 
-pub mod message;
 pub mod connector;
+pub mod message;
 
 use message::SystemInterval;
 
@@ -41,7 +44,8 @@ pub struct Node {
 
 impl Node {
     pub fn new(mut details: NodeDetails) -> Self {
-        let startup_time = details.startup_time
+        let startup_time = details
+            .startup_time
             .take()
             .and_then(|time| time.parse().ok());
 
@@ -111,7 +115,11 @@ impl Node {
         }
     }
 
-    pub fn update_details(&mut self, timestamp: u64, propagation_time: Option<u64>) -> Option<&BlockDetails> {
+    pub fn update_details(
+        &mut self,
+        timestamp: u64,
+        propagation_time: Option<u64>,
+    ) -> Option<&BlockDetails> {
         self.best.block_time = timestamp - self.best.block_timestamp;
         self.best.block_timestamp = timestamp;
         self.best.propagation_time = propagation_time;
@@ -142,26 +150,26 @@ impl Node {
     }
 
     pub fn update_stats(&mut self, interval: &SystemInterval) -> Option<&NodeStats> {
-      let mut changed = false;
+        let mut changed = false;
 
-      if let Some(peers) = interval.peers {
-          if peers != self.stats.peers {
-              self.stats.peers = peers;
-              changed = true;
-          }
-      }
-      if let Some(txcount) = interval.txcount {
-          if txcount != self.stats.txcount {
-              self.stats.txcount = txcount;
-              changed = true;
-          }
-      }
+        if let Some(peers) = interval.peers {
+            if peers != self.stats.peers {
+                self.stats.peers = peers;
+                changed = true;
+            }
+        }
+        if let Some(txcount) = interval.txcount {
+            if txcount != self.stats.txcount {
+                self.stats.txcount = txcount;
+                changed = true;
+            }
+        }
 
-      if changed {
-          Some(&self.stats)
-      } else {
-          None
-      }
+        if changed {
+            Some(&self.stats)
+        } else {
+            None
+        }
     }
 
     pub fn update_io(&mut self, interval: &SystemInterval) -> Option<&NodeIO> {
diff --git a/backend/src/node/connector.rs b/backend/src/node/connector.rs
index fc71a19..819d0f3 100644
--- a/backend/src/node/connector.rs
+++ b/backend/src/node/connector.rs
@@ -1,18 +1,18 @@
 use std::collections::BTreeMap;
-use std::time::{Duration, Instant};
-use std::net::Ipv4Addr;
 use std::mem;
+use std::net::Ipv4Addr;
+use std::time::{Duration, Instant};
 
-use bytes::{Bytes, BytesMut};
-use actix::prelude::*;
-use actix_web_actors::ws::{self, CloseReason};
-use actix_http::ws::Item;
-use crate::aggregator::{Aggregator, AddNode};
-use crate::chain::{Chain, UpdateNode, RemoveNode};
-use crate::node::NodeId;
+use crate::aggregator::{AddNode, Aggregator};
+use crate::chain::{Chain, RemoveNode, UpdateNode};
 use crate::node::message::{NodeMessage, Payload};
-use crate::util::LocateRequest;
+use crate::node::NodeId;
 use crate::types::ConnId;
+use crate::util::LocateRequest;
+use actix::prelude::*;
+use actix_http::ws::Item;
+use actix_web_actors::ws::{self, CloseReason};
+use bytes::{Bytes, BytesMut};
 
 /// How often heartbeat pings are sent
 const HEARTBEAT_INTERVAL: Duration = Duration::from_secs(20);
@@ -45,8 +45,8 @@ enum ConnMultiplex {
     },
     Waiting {
         /// Backlog of messages to be sent once we get a recipient handle to the chain
-        backlog: Vec<NodeMessage>,
-    }
+        backlog: Vec<Payload>,
+    },
 }
 
 impl Default for ConnMultiplex {
@@ -74,7 +74,11 @@ impl Actor for NodeConnector {
 }
 
 impl NodeConnector {
-    pub fn new(aggregator: Addr<Aggregator>, locator: Recipient<LocateRequest>, ip: Option<Ipv4Addr>) -> Self {
+    pub fn new(
+        aggregator: Addr<Aggregator>,
+        locator: Recipient<LocateRequest>,
+        ip: Option<Ipv4Addr>,
+    ) -> Self {
         Self {
             multiplex: BTreeMap::new(),
             hb: Instant::now(),
@@ -90,40 +94,46 @@ impl NodeConnector {
             // check client heartbeats
             if Instant::now().duration_since(act.hb) > CLIENT_TIMEOUT {
                 // stop actor
-                ctx.close(Some(CloseReason { code: ws::CloseCode::Abnormal, description: Some("Missed heartbeat".into())}));
+                ctx.close(Some(CloseReason {
+                    code: ws::CloseCode::Abnormal,
+                    description: Some("Missed heartbeat".into()),
+                }));
                 ctx.stop();
             }
         });
     }
 
-    fn handle_message(&mut self, msg: NodeMessage, data: Bytes, ctx: &mut <Self as Actor>::Context) {
+    fn handle_message(
+        &mut self,
+        msg: NodeMessage,
+        data: Bytes,
+        ctx: &mut <Self as Actor>::Context,
+    ) {
         let conn_id = msg.id();
+        let payload = msg.into();
 
         match self.multiplex.entry(conn_id).or_default() {
             ConnMultiplex::Connected { nid, chain } => {
                 chain.do_send(UpdateNode {
                     nid: *nid,
-                    msg,
                     raw: Some(data),
+                    payload,
                 });
             }
             ConnMultiplex::Waiting { backlog } => {
-                if let Payload::SystemConnected(connected) = msg.payload() {
-                    let mut node = connected.node.clone();
-                    // FIXME: Use genesis hash instead of names to avoid this mess
-                    match &*node.chain {
-                        "Kusama CC3" => node.chain = "Kusama".into(),
-                        "Polkadot CC1" => node.chain = "Polkadot".into(),
-                        _ => ()
-                    }
-
-                    self.aggregator.do_send(AddNode { node, conn_id, node_connector: ctx.address() });
+                if let Payload::SystemConnected(connected) = payload {
+                    self.aggregator.do_send(AddNode {
+                        node: connected.node,
+                        genesis_hash: connected.genesis_hash,
+                        conn_id,
+                        node_connector: ctx.address(),
+                    });
                 } else {
                     if backlog.len() >= 10 {
                         backlog.remove(0);
                     }
 
-                    backlog.push(msg);
+                    backlog.push(payload);
                 }
             }
         }
@@ -180,13 +190,21 @@ impl Handler<Initialize> for NodeConnector {
     type Result = ();
 
     fn handle(&mut self, msg: Initialize, _: &mut Self::Context) {
-        let Initialize { nid, conn_id, chain } = msg;
+        let Initialize {
+            nid,
+            conn_id,
+            chain,
+        } = msg;
         log::trace!(target: "NodeConnector::Initialize", "Initializing a node, nid={}, on conn_id={}", nid, conn_id);
         let mx = self.multiplex.entry(conn_id).or_default();
 
         if let ConnMultiplex::Waiting { backlog } = mx {
-            for msg in backlog.drain(..) {
-                chain.do_send(UpdateNode { nid, msg, raw: None });
+            for payload in backlog.drain(..) {
+                chain.do_send(UpdateNode {
+                    nid,
+                    raw: None,
+                    payload,
+                });
             }
 
             *mx = ConnMultiplex::Connected {
@@ -233,7 +251,7 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for NodeConnector {
                     self.continue_frame(&bytes);
                     self.finish_frame()
                 }
-            }
+            },
             Err(error) => {
                 log::error!("{:?}", error);
                 ctx.stop();
@@ -242,14 +260,16 @@ impl StreamHandler<Result<ws::Message, ws::ProtocolError>> for NodeConnector {
         };
 
         match serde_json::from_slice(&data) {
-            Ok(msg) => {
-                self.handle_message(msg, data, ctx)
-            },
+            Ok(msg) => self.handle_message(msg, data, ctx),
             #[cfg(debug)]
             Err(err) => {
                 let data: &[u8] = data.get(..512).unwrap_or_else(|| &data);
-                log::warn!("Failed to parse node message: {} {}", err, std::str::from_utf8(data).unwrap_or_else(|_| "INVALID UTF8"))
-            },
+                log::warn!(
+                    "Failed to parse node message: {} {}",
+                    err,
+                    std::str::from_utf8(data).unwrap_or_else(|_| "INVALID UTF8")
+                )
+            }
             #[cfg(not(debug))]
             Err(_) => (),
         }
diff --git a/backend/src/node/message.rs b/backend/src/node/message.rs
index 03f0d8a..8738c8a 100644
--- a/backend/src/node/message.rs
+++ b/backend/src/node/message.rs
@@ -1,8 +1,9 @@
-use actix::prelude::*;
-use serde::Deserialize;
-use serde::de::IgnoredAny;
 use crate::node::NodeDetails;
-use crate::types::{Block, BlockNumber, BlockHash, ConnId};
+use crate::types::{Block, BlockHash, BlockNumber, ConnId};
+use crate::util::Hash;
+use actix::prelude::*;
+use serde::de::IgnoredAny;
+use serde::Deserialize;
 
 #[derive(Deserialize, Debug, Message)]
 #[rtype(result = "()")]
@@ -19,13 +20,6 @@ pub enum NodeMessage {
 }
 
 impl NodeMessage {
-    /// Returns a reference to the payload.
-    pub fn payload(&self) -> &Payload {
-        match self {
-            NodeMessage::V1 { payload, .. } | NodeMessage::V2 { payload, .. } => payload,
-        }
-    }
-
     /// Returns the connection ID or 0 if there is no ID.
     pub fn id(&self) -> ConnId {
         match self {
@@ -35,6 +29,14 @@ impl NodeMessage {
     }
 }
 
+impl From<NodeMessage> for Payload {
+    fn from(msg: NodeMessage) -> Payload {
+        match msg {
+            NodeMessage::V1 { payload, .. } | NodeMessage::V2 { payload, .. } => payload,
+        }
+    }
+}
+
 #[derive(Deserialize, Debug)]
 #[serde(tag = "msg")]
 pub enum Payload {
@@ -70,7 +72,7 @@ pub enum Payload {
 
 #[derive(Deserialize, Debug)]
 pub struct SystemConnected {
-    pub network_id: Option<Box<str>>,
+    pub genesis_hash: Hash,
     #[serde(flatten)]
     pub node: NodeDetails,
 }
@@ -154,19 +156,15 @@ impl Payload {
 
     pub fn finalized_block(&self) -> Option<Block> {
         match self {
-            Payload::SystemInterval(ref interval) => {
-                Some(Block {
-                    hash: interval.finalized_hash?,
-                    height: interval.finalized_height?,
-                })
-            },
-            Payload::NotifyFinalized(ref finalized) => {
-                Some(Block {
-                    hash: finalized.hash,
-                    height: finalized.height.parse().ok()?
-                })
-            },
-            _ => None
+            Payload::SystemInterval(ref interval) => Some(Block {
+                hash: interval.finalized_hash?,
+                height: interval.finalized_height?,
+            }),
+            Payload::NotifyFinalized(ref finalized) => Some(Block {
+                hash: finalized.hash,
+                height: finalized.height.parse().ok()?,
+            }),
+            _ => None,
         }
     }
 }
diff --git a/backend/src/types.rs b/backend/src/types.rs
index 42db6ac..a93a709 100644
--- a/backend/src/types.rs
+++ b/backend/src/types.rs
@@ -1,7 +1,7 @@
-use serde::ser::{Serialize, Serializer, SerializeTuple};
+use serde::ser::{Serialize, SerializeTuple, Serializer};
 use serde::Deserialize;
 
-use crate::util::{MeanList, now};
+use crate::util::{now, MeanList};
 
 pub type NodeId = usize;
 pub type ConnId = u64;
diff --git a/backend/src/util.rs b/backend/src/util.rs
index e19dd45..374ec78 100644
--- a/backend/src/util.rs
+++ b/backend/src/util.rs
@@ -1,11 +1,13 @@
 mod dense_map;
+mod hash;
+mod location;
 mod mean_list;
 mod num_stats;
-mod location;
 
-pub use mean_list::MeanList;
-pub use location::{Locator, LocatorFactory, LocateRequest};
 pub use dense_map::DenseMap;
+pub use hash::Hash;
+pub use location::{LocateRequest, Locator, LocatorFactory};
+pub use mean_list::MeanList;
 pub use num_stats::NumStats;
 
 pub fn fnv<D: AsRef<[u8]>>(data: D) -> u64 {
diff --git a/backend/src/util/dense_map.rs b/backend/src/util/dense_map.rs
index 730e828..8c06af5 100644
--- a/backend/src/util/dense_map.rs
+++ b/backend/src/util/dense_map.rs
@@ -27,12 +27,12 @@ impl<T> DenseMap<T> {
             Some(id) => {
                 self.items[id] = Some(f(id));
                 id
-            },
+            }
             None => {
                 let id = self.items.len();
                 self.items.push(Some(f(id)));
                 id
-            },
+            }
         }
     }
 
@@ -57,15 +57,17 @@ impl<T> DenseMap<T> {
     }
 
     pub fn iter(&self) -> impl Iterator<Item = (Id, &T)> + '_ {
-        self.items.iter().enumerate().filter_map(|(id, item)| {
-            Some((id, item.as_ref()?))
-        })
+        self.items
+            .iter()
+            .enumerate()
+            .filter_map(|(id, item)| Some((id, item.as_ref()?)))
     }
 
     pub fn iter_mut(&mut self) -> impl Iterator<Item = (Id, &mut T)> + '_ {
-        self.items.iter_mut().enumerate().filter_map(|(id, item)| {
-            Some((id, item.as_mut()?))
-        })
+        self.items
+            .iter_mut()
+            .enumerate()
+            .filter_map(|(id, item)| Some((id, item.as_mut()?)))
     }
 
     pub fn len(&self) -> usize {
diff --git a/backend/src/util/hash.rs b/backend/src/util/hash.rs
new file mode 100644
index 0000000..db9a557
--- /dev/null
+++ b/backend/src/util/hash.rs
@@ -0,0 +1,58 @@
+use std::fmt::{self, Debug};
+
+use serde::de::{self, Deserialize, Deserializer, Unexpected, Visitor};
+
+const HASH_BYTES: usize = 32;
+
+/// Newtype wrapper for 32-byte hash values, implementing readable `Debug` and `serde::Deserialize`.
+// We could use primitive_types::H256 here, but opted for a custom type to aboid more dependencies.
+#[derive(Hash, PartialEq, Eq, Clone, Copy)]
+pub struct Hash([u8; HASH_BYTES]);
+
+struct HashVisitor;
+
+impl<'de> Visitor<'de> for HashVisitor {
+    type Value = Hash;
+
+    fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
+        formatter.write_str("hexidecimal string of 32 bytes beginning with 0x")
+    }
+
+    fn visit_str<E>(self, value: &str) -> Result<Self::Value, E>
+    where
+        E: de::Error,
+    {
+        if !value.starts_with("0x") {
+            return Err(de::Error::invalid_value(Unexpected::Str(value), &self));
+        }
+
+        let mut hash = [0; HASH_BYTES];
+
+        hex::decode_to_slice(&value[2..], &mut hash)
+            .map_err(|_| de::Error::invalid_value(Unexpected::Str(value), &self))?;
+
+        Ok(Hash(hash))
+    }
+}
+
+impl<'de> Deserialize<'de> for Hash {
+    fn deserialize<D>(deserializer: D) -> Result<Hash, D::Error>
+    where
+        D: Deserializer<'de>,
+    {
+        deserializer.deserialize_str(HashVisitor)
+    }
+}
+
+impl Debug for Hash {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        f.write_str("0x")?;
+
+        let mut ascii = [0; HASH_BYTES * 2];
+
+        hex::encode_to_slice(self.0, &mut ascii)
+            .expect("Encoding 32 bytes into 64 bytes of ascii; qed");
+
+        f.write_str(std::str::from_utf8(&ascii).expect("ASCII hex encoded bytes canot fail; qed"))
+    }
+}
diff --git a/backend/src/util/location.rs b/backend/src/util/location.rs
index 3ce82fa..777e0c1 100644
--- a/backend/src/util/location.rs
+++ b/backend/src/util/location.rs
@@ -2,8 +2,8 @@ use std::net::Ipv4Addr;
 use std::sync::Arc;
 
 use actix::prelude::*;
-use rustc_hash::FxHashMap;
 use parking_lot::RwLock;
+use rustc_hash::FxHashMap;
 use serde::Deserialize;
 
 use crate::chain::{Chain, LocateNode};
@@ -26,7 +26,11 @@ impl LocatorFactory {
         // Default entry for localhost
         cache.insert(
             Ipv4Addr::new(127, 0, 0, 1),
-            Some(Arc::new(NodeLocation { latitude: 52.516_6667, longitude: 13.4, city: "Berlin".into() })),
+            Some(Arc::new(NodeLocation {
+                latitude: 52.516_6667,
+                longitude: 13.4,
+                city: "Berlin".into(),
+            })),
         );
 
         LocatorFactory {
@@ -90,10 +94,13 @@ impl Handler<LocateRequest> for Locator {
 
         if let Some(item) = self.cache.read().get(&ip) {
             if let Some(location) = item {
-                return chain.do_send(LocateNode { nid, location: location.clone() });
+                return chain.do_send(LocateNode {
+                    nid,
+                    location: location.clone(),
+                });
             }
 
-            return
+            return;
         }
 
         let location = match self.iplocate(ip) {
@@ -120,15 +127,20 @@ impl Locator {
     }
 
     fn iplocate_ipapi_co(&self, ip: Ipv4Addr) -> Result<Option<Arc<NodeLocation>>, reqwest::Error> {
-        let location = self.query(&format!("https://ipapi.co/{}/json", ip))?.map(Arc::new);
+        let location = self
+            .query(&format!("https://ipapi.co/{}/json", ip))?
+            .map(Arc::new);
 
         Ok(location)
     }
 
-    fn iplocate_ipinfo_io(&self, ip: Ipv4Addr) -> Result<Option<Arc<NodeLocation>>, reqwest::Error> {
-        let location = self.query(&format!("https://ipinfo.io/{}/json", ip))?.and_then(|loc: IPApiLocate| {
-            loc.into_node_location().map(Arc::new)
-        });
+    fn iplocate_ipinfo_io(
+        &self,
+        ip: Ipv4Addr,
+    ) -> Result<Option<Arc<NodeLocation>>, reqwest::Error> {
+        let location = self
+            .query(&format!("https://ipinfo.io/{}/json", ip))?
+            .and_then(|loc: IPApiLocate| loc.into_node_location().map(Arc::new));
 
         Ok(location)
     }
diff --git a/backend/src/util/mean_list.rs b/backend/src/util/mean_list.rs
index 2a15d87..ce91aaa 100644
--- a/backend/src/util/mean_list.rs
+++ b/backend/src/util/mean_list.rs
@@ -1,7 +1,10 @@
 use num_traits::{Float, Zero};
 use std::ops::AddAssign;
 
-pub struct MeanList<T> where T: Float + AddAssign + Zero + From<u8> {
+pub struct MeanList<T>
+where
+    T: Float + AddAssign + Zero + From<u8>,
+{
     period_sum: T,
     period_count: u8,
     mean_index: u8,
@@ -24,7 +27,10 @@ where
     }
 }
 
-impl<T> MeanList<T> where T: Float + AddAssign + Zero + From<u8> {
+impl<T> MeanList<T>
+where
+    T: Float + AddAssign + Zero + From<u8>,
+{
     pub fn slice(&self) -> &[T] {
         &self.means[..usize::from(self.mean_index)]
     }
diff --git a/backend/src/util/num_stats.rs b/backend/src/util/num_stats.rs
index ea23a19..8bec802 100644
--- a/backend/src/util/num_stats.rs
+++ b/backend/src/util/num_stats.rs
@@ -1,6 +1,6 @@
-use num_traits::{Zero, NumOps, Bounded};
-use std::iter::Sum;
+use num_traits::{Bounded, NumOps, Zero};
 use std::convert::TryFrom;
+use std::iter::Sum;
 
 /// Keep track of last N numbers pushed onto internal stack.
 /// Provides means to get an average of said numbers.
@@ -101,4 +101,4 @@ mod tests {
 
         assert_eq!(stats.average(), 5);
     }
-}
\ No newline at end of file
+}