diff --git a/packages/btcindexer/db/migrations/0001_initial_schema.sql b/packages/btcindexer/db/migrations/0001_initial_schema.sql
index 918df6c6..f1e3bb87 100644
--- a/packages/btcindexer/db/migrations/0001_initial_schema.sql
+++ b/packages/btcindexer/db/migrations/0001_initial_schema.sql
@@ -12,15 +12,16 @@ CREATE INDEX btc_blocks_status ON btc_blocks (status);
 
 -- This table tracks the nBTC deposit txs (minting)
 CREATE TABLE nbtc_minting (
-    tx_id TEXT PRIMARY KEY,
-    block_hash TEXT NOT NULL,
-    block_height INTEGER NOT NULL,
-    vout INTEGER NOT NULL,
+    tx_id TEXT NOT NULL,
+	vout INTEGER NOT NULL,
+    block_hash TEXT,
+    block_height INTEGER,
     sui_recipient TEXT NOT NULL,
     amount_sats INTEGER NOT NULL,
     status TEXT NOT NULL, -- 'broadcasting' | 'confirming' | 'finalized' | 'minting' | 'minted' | 'reorg'
     created_at INTEGER NOT NULL, -- timestamp_ms
     updated_at INTEGER NOT NULL, -- timestamp_ms
+	PRIMARY KEY (tx_id, vout)
 ) STRICT;
 
 CREATE INDEX nbtc_minting_status ON nbtc_txs (status);
diff --git a/packages/btcindexer/src/btcindexer.test.ts b/packages/btcindexer/src/btcindexer.test.ts
index cc1b8a8e..2d040f12 100644
--- a/packages/btcindexer/src/btcindexer.test.ts
+++ b/packages/btcindexer/src/btcindexer.test.ts
@@ -65,6 +65,7 @@ const createMockStmt = () => ({
 function mkMockD1() {
 	return {
 		prepare: vi.fn().mockImplementation(() => createMockStmt()),
+		batch: vi.fn().mockResolvedValue({ success: true }),
 	};
 }
 
@@ -264,3 +265,41 @@ describe("Block Parsing", () => {
 		);
 	});
 });
+
+describe("Indexer.registerBroadcastedNbtcTx", () => {
+	it("should register a tx with a single deposit", async () => {
+		const { mockEnv, indexer } = prepareIndexer();
+		const blockData = REGTEST_DATA[303];
+		const block = Block.fromHex(blockData.rawBlockHex);
+		const targetTx = block.transactions?.find((tx) => tx.getId() === blockData.txs[1].id);
+		assert(targetTx);
+
+		const txHex = targetTx.toHex();
+		await indexer.registerBroadcastedNbtcTx(txHex);
+
+		const insertStmt = mockEnv.DB.prepare.mock.results[0].value;
+		expect(mockEnv.DB.prepare).toHaveBeenCalledWith(
+			expect.stringContaining("INSERT OR IGNORE INTO nbtc_minting"),
+		);
+		expect(insertStmt.bind).toHaveBeenCalledWith(
+			blockData.txs[1].id,
+			1, // vout
+			blockData.txs[1].suiAddr,
+			blockData.txs[1].amountSats,
+			expect.any(Number),
+			expect.any(Number),
+		);
+	});
+
+	it("should throw an error for a transaction with no valid deposits", async () => {
+		const { indexer } = prepareIndexer();
+		const block = Block.fromHex(REGTEST_DATA[303].rawBlockHex);
+		assert(block.transactions);
+		// The first tx in a block is coinbase
+		const coinbaseTx = block.transactions[0];
+
+		await expect(indexer.registerBroadcastedNbtcTx(coinbaseTx.toHex())).rejects.toThrow(
+			"Transaction does not contain any valid nBTC deposits.",
+		);
+	});
+});
diff --git a/packages/btcindexer/src/btcindexer.ts b/packages/btcindexer/src/btcindexer.ts
index 1c9931ae..46177a9f 100644
--- a/packages/btcindexer/src/btcindexer.ts
+++ b/packages/btcindexer/src/btcindexer.ts
@@ -124,8 +124,15 @@ export class Indexer implements Storage {
 
 		const nbtcTxStatements: D1PreparedStatement[] = [];
 
-		const insertNbtcTxStmt = this.d1.prepare(
-			"INSERT INTO nbtc_minting (tx_id, block_hash, block_height, vout, sui_recipient, amount_sats, status) VALUES (?, ?, ?, ?, ?, ?, ?)",
+		const now = Date.now();
+		const insertOrUpdateNbtcTxStmt = this.d1.prepare(
+			`INSERT INTO nbtc_minting (tx_id, vout, block_hash, block_height, sui_recipient, amount_sats, status, created_at, updated_at)
+         	VALUES (?, ?, ?, ?, ?, ?, 'confirming', ?, ?)
+         	ON CONFLICT(tx_id, vout) DO UPDATE SET
+				block_hash = excluded.block_hash,
+				block_height = excluded.block_height,
+				status = 'confirming',
+				updated_at = excluded.updated_at`,
 		);
 
 		for (const blockInfo of blocksToProcess.results) {
@@ -142,14 +149,15 @@ export class Indexer implements Storage {
 				const deposits = this.findNbtcDeposits(tx);
 				for (const deposit of deposits) {
 					nbtcTxStatements.push(
-						insertNbtcTxStmt.bind(
+						insertOrUpdateNbtcTxStmt.bind(
 							tx.getId(),
+							deposit.vout,
 							blockInfo.hash,
 							blockInfo.height,
-							deposit.vout,
 							deposit.suiRecipient,
 							deposit.amountSats,
-							"confirming",
+							now,
+							now,
 						),
 					);
 				}
@@ -283,7 +291,7 @@ export class Indexer implements Storage {
 				});
 			}
 		}
-		const now = +new Date();
+		const now = Date.now();
 		const setMintedStmt = this.d1.prepare(
 			`UPDATE nbtc_minting SET status = 'minted', updated_at = ${now} WHERE tx_id = ?`,
 		);
@@ -351,7 +359,7 @@ export class Indexer implements Storage {
 	): Promise<{ reorgUpdates: D1PreparedStatement[]; reorgedTxIds: string[] }> {
 		const reorgUpdates: D1PreparedStatement[] = [];
 		const reorgedTxIds: string[] = [];
-		const now = +new Date();
+		const now = Date.now();
 		const reorgCheckStmt = this.d1.prepare("SELECT hash FROM btc_blocks WHERE height = ?");
 		const reorgStmt = this.d1.prepare(
 			`UPDATE nbtc_minting SET status = 'reorg', updated_at = ${now} WHERE tx_id = ?`,
@@ -377,7 +385,7 @@ export class Indexer implements Storage {
 
 	selectFinalizedNbtcTxs(pendingTxs: PendingTx[], latestHeight: number): D1PreparedStatement[] {
 		const updates: D1PreparedStatement[] = [];
-		const now = +new Date();
+		const now = Date.now();
 		const finalizeStmt = this.d1.prepare(
 			`UPDATE nbtc_minting SET status = 'finalized', updated_at = ${now} WHERE tx_id = ?`,
 		);
@@ -446,4 +454,31 @@ export class Indexer implements Storage {
 			};
 		});
 	}
+
+	async registerBroadcastedNbtcTx(
+		txHex: string,
+	): Promise<{ tx_id: string; registered_deposits: number }> {
+		const tx = Transaction.fromHex(txHex);
+		const txId = tx.getId();
+
+		const deposits = this.findNbtcDeposits(tx);
+		if (deposits.length === 0) {
+			throw new Error("Transaction does not contain any valid nBTC deposits.");
+		}
+
+		const now = Date.now();
+		const insertStmt = this.d1.prepare(
+			`INSERT OR IGNORE INTO nbtc_minting (tx_id, vout, sui_recipient, amount_sats, status, created_at, updated_at)
+         VALUES (?, ?, ?, ?, 'broadcasting', ?, ?)`,
+		);
+
+		const statements = deposits.map((deposit) =>
+			insertStmt.bind(txId, deposit.vout, deposit.suiRecipient, deposit.amountSats, now, now),
+		);
+
+		await this.d1.batch(statements);
+
+		console.log(`Successfully registered ${statements.length} deposit(s) for nBTC tx ${txId}.`);
+		return { tx_id: txId, registered_deposits: statements.length };
+	}
 }
diff --git a/packages/btcindexer/src/models.ts b/packages/btcindexer/src/models.ts
index 6aafe658..3ebd3dd0 100644
--- a/packages/btcindexer/src/models.ts
+++ b/packages/btcindexer/src/models.ts
@@ -58,3 +58,7 @@ export interface MintBatchArg {
 	txIndex: number;
 	proof: ProofResult;
 }
+
+export interface PostNbtcTxRequest {
+	txHex: string;
+}
diff --git a/packages/btcindexer/src/nbtc_tx.ts b/packages/btcindexer/src/nbtc_tx.ts
deleted file mode 100644
index df1622e1..00000000
--- a/packages/btcindexer/src/nbtc_tx.ts
+++ /dev/null
@@ -1,20 +0,0 @@
-export type NbtcTxStatus =
-	| "broadcasting"
-	| "confirming"
-	| "finalized"
-	| "minting"
-	| "minted"
-	| "reorg";
-
-export interface NbtcTx {
-	tx_id: string;
-	block_hash: string;
-	block_height: number;
-	vout: number;
-	sender_address: string;
-	sui_recipient: string;
-	amount_sats: number;
-	status: NbtcTxStatus;
-	created_at: string;
-	updated_at: string;
-}
diff --git a/packages/btcindexer/src/router.ts b/packages/btcindexer/src/router.ts
index b0d42bda..876a6050 100644
--- a/packages/btcindexer/src/router.ts
+++ b/packages/btcindexer/src/router.ts
@@ -3,6 +3,7 @@ import { isValidSuiAddress } from "@mysten/sui/utils";
 
 import { Indexer } from "./btcindexer";
 import { RestPath } from "./api/client";
+import { PostNbtcTxRequest } from "./models";
 
 import type { AppRouter, CFArgs } from "./routertype";
 import { PutBlocksReq } from "./api/put-blocks";
@@ -25,7 +26,7 @@ export default class HttpRouter {
 		});
 
 		r.put(RestPath.blocks, this.putBlocks);
-		r.put(RestPath.nbtcTx, this.putNbtcTx);
+		r.post(RestPath.nbtcTx, this.postNbtcTx);
 
 		// ?sui_recipient="0x..."  - query by sui address
 		r.get(RestPath.nbtcTx, this.getStatusBySuiAddress);
@@ -83,8 +84,21 @@ export default class HttpRouter {
 		}
 	};
 
-	putNbtcTx = async (req: IRequest) => {
-		return { inserted: await this.indexer().putNbtcTx() };
+	postNbtcTx = async (req: IRequest) => {
+		const body: PostNbtcTxRequest = await req.json();
+
+		if (!body || typeof body.txHex !== "string") {
+			return error(400, "Request body must be a JSON object with a 'txHex' property.");
+		}
+
+		try {
+			const result = await this.indexer().registerBroadcastedNbtcTx(body.txHex);
+			return { success: true, ...result };
+		} catch (e: unknown) {
+			console.error("Failed to register nBTC tx:", e);
+			const message = e instanceof Error ? e.message : "An unknown error occurred.";
+			return error(400, message);
+		}
 	};
 
 	//