diff --git a/Cargo.lock b/Cargo.lock
index af219db7f..bd4432281 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1116,6 +1116,16 @@ dependencies = [
  "syn 2.0.66",
 ]
 
+[[package]]
+name = "explorer-mapper"
+version = "0.0.1"
+dependencies = [
+ "anyhow",
+ "everscale-types",
+ "explorer-models",
+ "serde_json",
+]
+
 [[package]]
 name = "explorer-models"
 version = "0.1.0"
diff --git a/Cargo.toml b/Cargo.toml
index f11c172e5..e4d82d1ab 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,6 +20,7 @@ members = [
     "simulator",
     "storage",
     "util",
+    "explorer-mapper",
 ]
 
 [workspace.dependencies]
diff --git a/explorer-mapper/Cargo.toml b/explorer-mapper/Cargo.toml
new file mode 100644
index 000000000..5cb119455
--- /dev/null
+++ b/explorer-mapper/Cargo.toml
@@ -0,0 +1,17 @@
+[package]
+name = "explorer-mapper"
+edition = "2021"
+version.workspace = true
+authors.workspace = true
+rust-version.workspace = true
+repository.workspace = true
+license.workspace = true
+
+[dependencies]
+anyhow = { workspace = true }
+explorer-models = { path = "../explorer-models" }
+everscale-types = { workspace = true }
+serde_json = { workspace = true }
+
+[lints]
+workspace = true
\ No newline at end of file
diff --git a/explorer-mapper/src/block.rs b/explorer-mapper/src/block.rs
new file mode 100644
index 000000000..b428b36e6
--- /dev/null
+++ b/explorer-mapper/src/block.rs
@@ -0,0 +1,71 @@
+use anyhow::Result;
+use everscale_types::models::{Block as BCBlock, BlockId, BlockInfo as BCBlockInfo, PrevBlockRef};
+use explorer_models::{Block, BlockInfo, GlobalVersion, HashInsert, ProcessingContext};
+
+pub fn fill_block(ctx: &mut ProcessingContext, block: &BCBlock, block_id: BlockId) -> Result<()> {
+    let block_info = block.load_info()?;
+    let prev_info = match block_info.load_prev_ref()? {
+        PrevBlockRef::Single(rf) => (rf, None),
+        PrevBlockRef::AfterMerge { left, right } => (left, Some(right)),
+    };
+
+    let block = Block {
+        workchain: block_id.shard.workchain() as i8,
+        shard: block_id.shard.prefix(),
+        seqno: block_id.seqno,
+        root_hash: HashInsert {
+            hash: block_id.root_hash.0,
+        },
+        file_hash: HashInsert {
+            hash: block_id.file_hash.0,
+        },
+        is_key_block: block_info.key_block,
+        transaction_count: 0,
+        gen_utime: block_info.gen_utime,
+        gen_software_version: block_info.gen_software.version,
+        prev1: HashInsert {
+            hash: prev_info.0.root_hash.0,
+        },
+        prev1_seqno: prev_info.0.seqno,
+        prev2: prev_info.1.map(|rf| HashInsert {
+            hash: rf.root_hash.0,
+        }),
+        prev2_seqno: prev_info.1.map(|rf| rf.seqno),
+        prev_key_block: block_info.prev_key_block_seqno,
+        block_info: "".to_string(),
+        value_flow: "".to_string(),
+        account_blocks: "".to_string(),
+        shards_info: None,
+        additional_info: None,
+    };
+}
+
+fn fill_block_info(
+    ctx: &mut ProcessingContext,
+    block: &BCBlock,
+    block_info: &BCBlockInfo,
+) -> Result<()> {
+    let block_info = BlockInfo {
+        version: block_info.version,
+        after_merge: block_info.after_merge,
+        before_split: block_info.before_split,
+        after_split: block_info.after_split,
+        want_split: block_info.want_split,
+        want_merge: block_info.want_merge,
+        key_block: block_info.key_block,
+        vert_seq_no: block_info.vert_seqno,
+        vert_seq_no_incr: 0, // todo: what is this?
+        flags: block_info.flags,
+        start_lt: block_info.start_lt,
+        end_lt: block_info.end_lt,
+        gen_validator_list_hash_short: block_info.gen_validator_list_hash_short,
+        gen_catchain_seqno: block_info.gen_catchain_seqno,
+        min_ref_mc_seqno: block_info.min_ref_mc_seqno,
+        prev_key_block_seqno: block_info.prev_key_block_seqno,
+        gen_software: Some(GlobalVersion{
+            version: 0,
+            capabilities: 0,
+        },
+                      
+    };
+}
diff --git a/explorer-mapper/src/lib.rs b/explorer-mapper/src/lib.rs
new file mode 100644
index 000000000..ea81df5e8
--- /dev/null
+++ b/explorer-mapper/src/lib.rs
@@ -0,0 +1,10 @@
+use everscale_types::models::Block;
+use explorer_models::ProcessingContext;
+
+mod block;
+
+pub fn fill_processing_context(block: Block) -> ProcessingContext {
+    let mut context = ProcessingContext::default();
+    context.blocks.push(block);
+    context
+}