From 9097762a530aa86ff5f656147c528d16321962b6 Mon Sep 17 00:00:00 2001
From: Oleksandr Pravdyvyi <awxrvtb@gmail.com>
Date: Thu, 17 Jul 2025 11:47:38 +0300
Subject: [PATCH] feat: node side of public native token transfer 1

---
 node_core/src/chain_storage/mod.rs | 15 ++++++++++
 node_core/src/lib.rs               | 48 +++++++++++++++++++++++++++++-
 2 files changed, 62 insertions(+), 1 deletion(-)

diff --git a/node_core/src/chain_storage/mod.rs b/node_core/src/chain_storage/mod.rs
index f6b1343..481cba8 100644
--- a/node_core/src/chain_storage/mod.rs
+++ b/node_core/src/chain_storage/mod.rs
@@ -7,6 +7,7 @@ use common::{
     block::Block,
     merkle_tree_public::merkle_tree::{PublicTransactionMerkleTree, UTXOCommitmentsMerkleTree},
     nullifier::UTXONullifier,
+    public_transfer_receipts::PublicNativeTokenSend,
     utxo_commitment::UTXOCommitment,
 };
 use k256::AffinePoint;
@@ -158,6 +159,20 @@ impl NodeChainStore {
                         }
                         _ => {}
                     }
+                } else {
+                    let native_transfer =
+                        serde_json::from_slice::<PublicNativeTokenSend>(&tx.execution_input);
+
+                    if let Ok(transfer) = native_transfer {
+                        if let Some(acc_sender) = self.acc_map.get_mut(&transfer.from) {
+                            //Can panic, we depend on sequencer maintaining chain consistency here
+                            acc_sender.balance -= transfer.moved_balance;
+
+                            if let Some(acc_rec) = self.acc_map.get_mut(&transfer.to) {
+                                acc_rec.balance += transfer.moved_balance;
+                            }
+                        }
+                    }
                 }
             }
 
diff --git a/node_core/src/lib.rs b/node_core/src/lib.rs
index 49f1285..4c36260 100644
--- a/node_core/src/lib.rs
+++ b/node_core/src/lib.rs
@@ -3,7 +3,7 @@ use std::sync::{
     Arc,
 };
 
-use common::ExecutionFailureKind;
+use common::{public_transfer_receipts::PublicNativeTokenSend, ExecutionFailureKind};
 
 use accounts::account_core::{Account, AccountAddress};
 use anyhow::Result;
@@ -943,6 +943,52 @@ impl NodeCore {
         Ok(self.sequencer_client.send_tx(tx, tx_roots).await?)
     }
 
+    pub async fn send_public_native_token_transfer(
+        &self,
+        from: AccountAddress,
+        to: AccountAddress,
+        moved_balance: u64,
+    ) -> Result<SendTxResponse, ExecutionFailureKind> {
+        let tx_roots = self.get_roots().await;
+
+        let public_context = {
+            let read_guard = self.storage.read().await;
+
+            read_guard.produce_context(from)
+        };
+
+        let (tweak, secret_r, commitment) = pedersen_commitment_vec(
+            //Will not panic, as public context is serializable
+            public_context.produce_u64_list_from_context().unwrap(),
+        );
+
+        let sc_addr = hex::encode([0; 32]);
+
+        //Native  does not change its state
+        let state_changes: Vec<DataBlobChangeVariant> = vec![];
+        let new_len = 0;
+        let state_changes = (serde_json::to_value(state_changes).unwrap(), new_len);
+
+        let tx: Transaction =
+            sc_core::transaction_payloads_tools::create_public_transaction_payload(
+                serde_json::to_vec(&PublicNativeTokenSend {
+                    from,
+                    to,
+                    moved_balance,
+                })
+                .unwrap(),
+                commitment,
+                tweak,
+                secret_r,
+                sc_addr,
+                state_changes,
+            )
+            .into();
+        tx.log();
+
+        Ok(self.sequencer_client.send_tx(tx, tx_roots).await?)
+    }
+
     pub async fn send_private_send_tx(
         &self,
         utxo: UTXO,