diff --git a/Cargo.lock b/Cargo.lock
index 199461bb..dee037a6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2954,6 +2954,7 @@ dependencies = [
  "env_logger",
  "futures",
  "hex",
+ "indexer",
  "key_protocol",
  "log",
  "nssa",
@@ -5176,6 +5177,7 @@ dependencies = [
  "chrono",
  "common",
  "futures",
+ "indexer",
  "log",
  "mempool",
  "nssa",
@@ -5196,10 +5198,12 @@ dependencies = [
  "anyhow",
  "base58",
  "base64",
+ "bedrock_client",
  "borsh",
  "common",
  "futures",
  "hex",
+ "indexer",
  "itertools 0.14.0",
  "log",
  "mempool",
@@ -5218,9 +5222,11 @@ dependencies = [
  "actix",
  "actix-web",
  "anyhow",
+ "bedrock_client",
  "clap",
  "common",
  "env_logger",
+ "indexer",
  "log",
  "sequencer_core",
  "sequencer_rpc",
diff --git a/Cargo.toml b/Cargo.toml
index 843e4f64..b010b08f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -19,7 +19,7 @@ members = [
   "examples/program_deployment",
   "examples/program_deployment/methods",
   "examples/program_deployment/methods/guest",
-  "bedrock_client", 
+  "bedrock_client",
   "indexer",
 ]
 
diff --git a/common/src/block.rs b/common/src/block.rs
index baba1e42..346c2126 100644
--- a/common/src/block.rs
+++ b/common/src/block.rs
@@ -69,6 +69,10 @@ impl HashableBlockData {
             },
         }
     }
+
+    pub fn block_hash(&self) -> BlockHash {
+        OwnHasher::hash(&borsh::to_vec(&self).unwrap())
+    }
 }
 
 impl From<Block> for HashableBlockData {
diff --git a/indexer/Cargo.toml b/indexer/Cargo.toml
index 2025a3b1..6d05bed5 100644
--- a/indexer/Cargo.toml
+++ b/indexer/Cargo.toml
@@ -30,4 +30,4 @@ async-stream = "0.3.6"
 indicatif = { version = "0.18.3", features = ["improved_unicode"] }
 risc0-zkvm.workspace = true
 url.workspace = true
-nomos-core.workspace = true
\ No newline at end of file
+nomos-core.workspace = true
diff --git a/indexer/src/config.rs b/indexer/src/config.rs
index 8818d15e..3c7a75fc 100644
--- a/indexer/src/config.rs
+++ b/indexer/src/config.rs
@@ -1,6 +1,7 @@
 use nomos_core::mantle::ops::channel::ChannelId;
+use serde::{Deserialize, Serialize};
 
-#[derive(Debug)]
+#[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct IndexerConfig {
     pub resubscribe_interval: u64,
     pub channel_id: ChannelId,
diff --git a/indexer/src/lib.rs b/indexer/src/lib.rs
index 1474f85c..93c5094b 100644
--- a/indexer/src/lib.rs
+++ b/indexer/src/lib.rs
@@ -1,6 +1,6 @@
 use anyhow::Result;
 use bedrock_client::{BasicAuthCredentials, BedrockClient};
-use common::block::HashableBlockData;
+use common::block::{BlockHash, HashableBlockData};
 use futures::StreamExt;
 use nomos_core::mantle::{
     Op, SignedMantleTx,
@@ -9,22 +9,24 @@ use nomos_core::mantle::{
 use tokio::sync::mpsc::Sender;
 use url::Url;
 
-use crate::config::IndexerConfig;
+use crate::{config::IndexerConfig, state::IndexerState};
 
 pub mod config;
+pub mod state;
 
 pub struct IndexerCore {
     pub bedrock_client: BedrockClient,
     pub bedrock_url: Url,
-    pub channel_sender: Sender<HashableBlockData>,
+    pub channel_sender: Sender<BlockHash>,
     pub config: IndexerConfig,
+    pub state: IndexerState,
 }
 
 impl IndexerCore {
     pub fn new(
         addr: &str,
         auth: Option<BasicAuthCredentials>,
-        sender: Sender<HashableBlockData>,
+        sender: Sender<BlockHash>,
         config: IndexerConfig,
     ) -> Result<Self> {
         Ok(Self {
@@ -32,6 +34,10 @@ impl IndexerCore {
             bedrock_url: Url::parse(addr)?,
             channel_sender: sender,
             config,
+            // No state setup for now, future task.
+            state: IndexerState {
+                latest_seen_block: 0,
+            },
         })
     }
 
@@ -58,7 +64,8 @@ impl IndexerCore {
                 );
 
                 for l2_block in l2_blocks_parsed {
-                    self.channel_sender.send(l2_block).await?;
+                    // Sending data into sequencer, may need to be expanded.
+                    self.channel_sender.send(l2_block.block_hash()).await?;
                 }
             }
         }
diff --git a/indexer/src/state.rs b/indexer/src/state.rs
new file mode 100644
index 00000000..74301688
--- /dev/null
+++ b/indexer/src/state.rs
@@ -0,0 +1,5 @@
+#[derive(Debug)]
+pub struct IndexerState {
+    // Only one field for now, for testing.
+    pub latest_seen_block: u64,
+}
diff --git a/integration_tests/Cargo.toml b/integration_tests/Cargo.toml
index b888c177..be29063c 100644
--- a/integration_tests/Cargo.toml
+++ b/integration_tests/Cargo.toml
@@ -11,6 +11,7 @@ sequencer_runner.workspace = true
 wallet.workspace = true
 common.workspace = true
 key_protocol.workspace = true
+indexer.workspace = true
 
 anyhow.workspace = true
 env_logger.workspace = true
diff --git a/integration_tests/tests/tps.rs b/integration_tests/tests/tps.rs
index b62a3ce7..6c2de6d9 100644
--- a/integration_tests/tests/tps.rs
+++ b/integration_tests/tests/tps.rs
@@ -1,6 +1,7 @@
 use std::time::{Duration, Instant};
 
 use anyhow::Result;
+use indexer::config::IndexerConfig;
 use integration_tests::TestContext;
 use key_protocol::key_management::ephemeral_key_holder::EphemeralKeyHolder;
 use log::info;
@@ -185,6 +186,12 @@ impl TpsTestManager {
             initial_accounts: initial_public_accounts,
             initial_commitments: vec![initial_commitment],
             signing_key: [37; 32],
+            bedrock_addr: "0.0.0.0".to_string(),
+            bedrock_auth: ("".to_string(), "".to_string()),
+            indexer_config: IndexerConfig {
+                resubscribe_interval: 100,
+                channel_id: [42; 32].into(),
+            },
         }
     }
 }
diff --git a/sequencer_core/Cargo.toml b/sequencer_core/Cargo.toml
index a844c524..71fe0e16 100644
--- a/sequencer_core/Cargo.toml
+++ b/sequencer_core/Cargo.toml
@@ -9,6 +9,7 @@ nssa_core.workspace = true
 common.workspace = true
 storage.workspace = true
 mempool.workspace = true
+indexer.workspace = true
 
 base58.workspace = true
 anyhow.workspace = true
@@ -17,11 +18,11 @@ serde_json.workspace = true
 tempfile.workspace = true
 chrono.workspace = true
 log.workspace = true
+tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }
 
 [features]
 default = []
 testnet = []
 
 [dev-dependencies]
-tokio = { workspace = true, features = ["rt-multi-thread", "macros"] }
 futures.workspace = true
diff --git a/sequencer_core/src/config.rs b/sequencer_core/src/config.rs
index 4ef08803..785c5328 100644
--- a/sequencer_core/src/config.rs
+++ b/sequencer_core/src/config.rs
@@ -5,6 +5,7 @@ use std::{
 };
 
 use anyhow::Result;
+use indexer::config::IndexerConfig;
 use serde::{Deserialize, Serialize};
 
 #[derive(Debug, Serialize, Deserialize, Clone)]
@@ -47,6 +48,12 @@ pub struct SequencerConfig {
     pub initial_commitments: Vec<CommitmentsInitialData>,
     /// Sequencer own signing key
     pub signing_key: [u8; 32],
+    /// Bedrock addr
+    pub bedrock_addr: String,
+    /// Bedrock auth
+    pub bedrock_auth: (String, String),
+    /// Indexer config
+    pub indexer_config: IndexerConfig,
 }
 
 impl SequencerConfig {
diff --git a/sequencer_core/src/lib.rs b/sequencer_core/src/lib.rs
index 8e193ff6..2c57a765 100644
--- a/sequencer_core/src/lib.rs
+++ b/sequencer_core/src/lib.rs
@@ -5,13 +5,14 @@ use anyhow::Result;
 use common::PINATA_BASE58;
 use common::{
     HashType,
-    block::HashableBlockData,
+    block::{BlockHash, HashableBlockData},
     transaction::{EncodedTransaction, NSSATransaction},
 };
 use config::SequencerConfig;
 use log::warn;
 use mempool::{MemPool, MemPoolHandle};
 use serde::{Deserialize, Serialize};
+use tokio::sync::mpsc::Receiver;
 
 use crate::block_store::SequencerBlockStore;
 
@@ -24,6 +25,9 @@ pub struct SequencerCore {
     mempool: MemPool<EncodedTransaction>,
     sequencer_config: SequencerConfig,
     chain_height: u64,
+    // No logic here for now
+    #[allow(unused)]
+    receiver: Receiver<BlockHash>,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
@@ -42,7 +46,10 @@ impl std::error::Error for TransactionMalformationError {}
 
 impl SequencerCore {
     /// Start Sequencer from configuration and construct transaction sender
-    pub fn start_from_config(config: SequencerConfig) -> (Self, MemPoolHandle<EncodedTransaction>) {
+    pub fn start_from_config(
+        config: SequencerConfig,
+        receiver: Receiver<BlockHash>,
+    ) -> (Self, MemPoolHandle<EncodedTransaction>) {
         let hashable_data = HashableBlockData {
             block_id: config.genesis_id,
             transactions: vec![],
@@ -93,6 +100,7 @@ impl SequencerCore {
             mempool,
             chain_height: config.genesis_id,
             sequencer_config: config,
+            receiver,
         };
 
         this.sync_state_with_stored_blocks();
@@ -248,6 +256,7 @@ mod tests {
 
     use base58::{FromBase58, ToBase58};
     use common::test_utils::sequencer_sign_key_for_testing;
+    use indexer::config::IndexerConfig;
     use nssa::PrivateKey;
 
     use super::*;
@@ -277,6 +286,12 @@ mod tests {
             initial_accounts,
             initial_commitments: vec![],
             signing_key: *sequencer_sign_key_for_testing().value(),
+            bedrock_addr: "0.0.0.0".to_string(),
+            bedrock_auth: ("".to_string(), "".to_string()),
+            indexer_config: IndexerConfig {
+                resubscribe_interval: 100,
+                channel_id: [42; 32].into(),
+            },
         }
     }
 
@@ -322,7 +337,9 @@ mod tests {
     async fn common_setup_with_config(
         config: SequencerConfig,
     ) -> (SequencerCore, MemPoolHandle<EncodedTransaction>) {
-        let (mut sequencer, mempool_handle) = SequencerCore::start_from_config(config);
+        let (_, receiver) = tokio::sync::mpsc::channel(100);
+
+        let (mut sequencer, mempool_handle) = SequencerCore::start_from_config(config, receiver);
 
         let tx = common::test_utils::produce_dummy_empty_transaction();
         mempool_handle.push(tx).await.unwrap();
@@ -337,7 +354,9 @@ mod tests {
     #[test]
     fn test_start_from_config() {
         let config = setup_sequencer_config();
-        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone());
+        let (_, receiver) = tokio::sync::mpsc::channel(100);
+        let (sequencer, _mempool_handle) =
+            SequencerCore::start_from_config(config.clone(), receiver);
 
         assert_eq!(sequencer.chain_height, config.genesis_id);
         assert_eq!(sequencer.sequencer_config.max_num_tx_in_block, 10);
@@ -396,7 +415,9 @@ mod tests {
         let initial_accounts = vec![initial_acc1, initial_acc2];
 
         let config = setup_sequencer_config_variable_initial_accounts(initial_accounts);
-        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone());
+        let (_, receiver) = tokio::sync::mpsc::channel(100);
+        let (sequencer, _mempool_handle) =
+            SequencerCore::start_from_config(config.clone(), receiver);
 
         let acc1_account_id = config.initial_accounts[0]
             .account_id
@@ -729,7 +750,9 @@ mod tests {
         // from `acc_1` to `acc_2`. The block created with that transaction will be kept stored in
         // the temporary directory for the block storage of this test.
         {
-            let (mut sequencer, mempool_handle) = SequencerCore::start_from_config(config.clone());
+            let (_, receiver) = tokio::sync::mpsc::channel(100);
+            let (mut sequencer, mempool_handle) =
+                SequencerCore::start_from_config(config.clone(), receiver);
             let signing_key = PrivateKey::try_new([1; 32]).unwrap();
 
             let tx = common::test_utils::create_transaction_native_token_transfer(
@@ -753,7 +776,9 @@ mod tests {
 
         // Instantiating a new sequencer from the same config. This should load the existing block
         // with the above transaction and update the state to reflect that.
-        let (sequencer, _mempool_handle) = SequencerCore::start_from_config(config.clone());
+        let (_, receiver) = tokio::sync::mpsc::channel(100);
+        let (sequencer, _mempool_handle) =
+            SequencerCore::start_from_config(config.clone(), receiver);
         let balance_acc_1 = sequencer.state.get_account_by_id(&acc1_account_id).balance;
         let balance_acc_2 = sequencer.state.get_account_by_id(&acc2_account_id).balance;
 
diff --git a/sequencer_rpc/Cargo.toml b/sequencer_rpc/Cargo.toml
index 2abd5400..cf95b009 100644
--- a/sequencer_rpc/Cargo.toml
+++ b/sequencer_rpc/Cargo.toml
@@ -8,6 +8,8 @@ nssa.workspace = true
 common.workspace = true
 mempool.workspace = true
 sequencer_core.workspace = true
+indexer.workspace = true
+bedrock_client.workspace = true
 
 anyhow.workspace = true
 serde_json.workspace = true
diff --git a/sequencer_rpc/src/lib.rs b/sequencer_rpc/src/lib.rs
index 89b3e8cd..d41dbbd3 100644
--- a/sequencer_rpc/src/lib.rs
+++ b/sequencer_rpc/src/lib.rs
@@ -8,6 +8,7 @@ use common::{
     rpc_primitives::errors::{RpcError, RpcErrorKind},
     transaction::EncodedTransaction,
 };
+use indexer::IndexerCore;
 use mempool::MemPoolHandle;
 pub use net_utils::*;
 use sequencer_core::SequencerCore;
@@ -20,6 +21,9 @@ use self::types::err_rpc::RpcErr;
 // ToDo: Add necessary fields
 pub struct JsonHandler {
     sequencer_state: Arc<Mutex<SequencerCore>>,
+    // No functionality for now.
+    #[allow(unused)]
+    indexer_state: Arc<Mutex<IndexerCore>>,
     mempool_handle: MemPoolHandle<EncodedTransaction>,
 }
 
diff --git a/sequencer_rpc/src/net_utils.rs b/sequencer_rpc/src/net_utils.rs
index 8b9b7e64..dc1f287b 100644
--- a/sequencer_rpc/src/net_utils.rs
+++ b/sequencer_rpc/src/net_utils.rs
@@ -7,6 +7,7 @@ use common::{
     transaction::EncodedTransaction,
 };
 use futures::{Future, FutureExt};
+use indexer::IndexerCore;
 use log::info;
 use mempool::MemPoolHandle;
 use sequencer_core::SequencerCore;
@@ -46,6 +47,7 @@ pub fn new_http_server(
     config: RpcConfig,
     seuquencer_core: Arc<Mutex<SequencerCore>>,
     mempool_handle: MemPoolHandle<EncodedTransaction>,
+    indexer_core: Arc<Mutex<IndexerCore>>,
 ) -> io::Result<(actix_web::dev::Server, SocketAddr)> {
     let RpcConfig {
         addr,
@@ -55,6 +57,7 @@ pub fn new_http_server(
     info!(target:NETWORK, "Starting HTTP server at {addr}");
     let handler = web::Data::new(JsonHandler {
         sequencer_state: seuquencer_core.clone(),
+        indexer_state: indexer_core.clone(),
         mempool_handle,
     });
 
diff --git a/sequencer_rpc/src/process.rs b/sequencer_rpc/src/process.rs
index 387abf28..097fb47b 100644
--- a/sequencer_rpc/src/process.rs
+++ b/sequencer_rpc/src/process.rs
@@ -340,7 +340,9 @@ mod tests {
 
     use base58::ToBase58;
     use base64::{Engine, engine::general_purpose};
+    use bedrock_client::BasicAuthCredentials;
     use common::{test_utils::sequencer_sign_key_for_testing, transaction::EncodedTransaction};
+    use indexer::{IndexerCore, config::IndexerConfig};
     use sequencer_core::{
         SequencerCore,
         config::{AccountInitialData, SequencerConfig},
@@ -388,12 +390,30 @@ mod tests {
             initial_accounts,
             initial_commitments: vec![],
             signing_key: *sequencer_sign_key_for_testing().value(),
+            bedrock_addr: "0.0.0.0".to_string(),
+            bedrock_auth: ("".to_string(), "".to_string()),
+            indexer_config: IndexerConfig {
+                resubscribe_interval: 100,
+                channel_id: [42; 32].into(),
+            },
         }
     }
 
     async fn components_for_tests() -> (JsonHandler, Vec<AccountInitialData>, EncodedTransaction) {
         let config = sequencer_config_for_tests();
-        let (mut sequencer_core, mempool_handle) = SequencerCore::start_from_config(config);
+        let (sender, receiver) = tokio::sync::mpsc::channel(100);
+        let indexer_core = IndexerCore::new(
+            &config.bedrock_addr,
+            Some(BasicAuthCredentials::new(
+                config.bedrock_auth.0.clone(),
+                Some(config.bedrock_auth.1.clone()),
+            )),
+            sender,
+            config.indexer_config.clone(),
+        )
+        .unwrap();
+        let (mut sequencer_core, mempool_handle) =
+            SequencerCore::start_from_config(config, receiver);
         let initial_accounts = sequencer_core.sequencer_config().initial_accounts.clone();
 
         let signing_key = nssa::PrivateKey::try_new([1; 32]).unwrap();
@@ -419,10 +439,12 @@ mod tests {
             .unwrap();
 
         let sequencer_core = Arc::new(Mutex::new(sequencer_core));
+        let indexer_core = Arc::new(Mutex::new(indexer_core));
 
         (
             JsonHandler {
                 sequencer_state: sequencer_core,
+                indexer_state: indexer_core,
                 mempool_handle,
             },
             initial_accounts,
diff --git a/sequencer_runner/Cargo.toml b/sequencer_runner/Cargo.toml
index 55f56dec..d98ecf66 100644
--- a/sequencer_runner/Cargo.toml
+++ b/sequencer_runner/Cargo.toml
@@ -7,6 +7,8 @@ edition = "2024"
 common.workspace = true
 sequencer_core = { workspace = true, features = ["testnet"] }
 sequencer_rpc.workspace = true
+indexer.workspace = true
+bedrock_client.workspace = true
 
 clap = { workspace = true, features = ["derive", "env"] }
 anyhow.workspace = true
diff --git a/sequencer_runner/src/lib.rs b/sequencer_runner/src/lib.rs
index 5c1ab920..c1863a17 100644
--- a/sequencer_runner/src/lib.rs
+++ b/sequencer_runner/src/lib.rs
@@ -2,8 +2,10 @@ use std::{net::SocketAddr, path::PathBuf, sync::Arc};
 
 use actix_web::dev::ServerHandle;
 use anyhow::Result;
+use bedrock_client::BasicAuthCredentials;
 use clap::Parser;
 use common::rpc_primitives::RpcConfig;
+use indexer::IndexerCore;
 use log::info;
 use sequencer_core::{SequencerCore, config::SequencerConfig};
 use sequencer_rpc::new_http_server;
@@ -24,16 +26,33 @@ pub async fn startup_sequencer(
     let block_timeout = app_config.block_create_timeout_millis;
     let port = app_config.port;
 
-    let (sequencer_core, mempool_handle) = SequencerCore::start_from_config(app_config);
+    // ToDo: Maybe make buffer size configurable.
+    let (sender, receiver) = tokio::sync::mpsc::channel(100);
+
+    let indexer_core = IndexerCore::new(
+        &app_config.bedrock_addr,
+        Some(BasicAuthCredentials::new(
+            app_config.bedrock_auth.0.clone(),
+            Some(app_config.bedrock_auth.1.clone()),
+        )),
+        sender,
+        app_config.indexer_config.clone(),
+    )?;
+
+    info!("Indexer core set up");
+
+    let (sequencer_core, mempool_handle) = SequencerCore::start_from_config(app_config, receiver);
 
     info!("Sequencer core set up");
 
+    let indexer_core_wrapped = Arc::new(Mutex::new(indexer_core));
     let seq_core_wrapped = Arc::new(Mutex::new(sequencer_core));
 
     let (http_server, addr) = new_http_server(
         RpcConfig::with_port(port),
         Arc::clone(&seq_core_wrapped),
         mempool_handle,
+        Arc::clone(&indexer_core_wrapped),
     )?;
     info!("HTTP server started");
     let http_server_handle = http_server.handle();