diff --git a/lib/wallet/txdb.js b/lib/wallet/txdb.js
index a1e53ab4f..63b825f2b 100644
--- a/lib/wallet/txdb.js
+++ b/lib/wallet/txdb.js
@@ -24,6 +24,14 @@ const NameUndo = require('../covenants/undo');
 const {TXRecord} = records;
 const {types} = rules;
 
+/** @typedef {import('./records').BlockMeta} BlockMeta */
+
+/**
+ * @typedef {Object} BlockExtraInfo
+ * @property {Number} medianTime
+ * @property {Number} txIndex
+ */
+
 /*
  * Constants
  */
@@ -369,6 +377,7 @@ class TXDB {
 
   /**
    * Append to the global block record.
+   * @param {Batch} b
    * @param {Hash} hash
    * @param {BlockMeta} block
    * @returns {Promise}
@@ -786,10 +795,11 @@ class TXDB {
    * Add transaction without a batch.
    * @param {TX} tx
    * @param {BlockMeta} [block]
+   * @param {BlockExtraInfo} [extra]
    * @returns {Promise<Details?>}
    */
 
-  async add(tx, block) {
+  async add(tx, block, extra) {
     const hash = tx.hash();
     const existing = await this.getTX(hash);
 
@@ -806,7 +816,7 @@ class TXDB {
         return null;
 
       // Confirm transaction.
-      return this.confirm(existing, block);
+      return this.confirm(existing, block, extra);
     }
 
     const wtx = TXRecord.fromTX(tx, block);
@@ -825,7 +835,7 @@ class TXDB {
     }
 
     // Finally we can do a regular insertion.
-    return this.insert(wtx, block);
+    return this.insert(wtx, block, extra);
   }
 
   /**
@@ -931,10 +941,11 @@ class TXDB {
    * @private
    * @param {TXRecord} wtx
    * @param {BlockMeta} [block]
+   * @param {BlockExtraInfo} [extra]
    * @returns {Promise<Details>}
    */
 
-  async insert(wtx, block) {
+  async insert(wtx, block, extra) {
     const b = this.bucket.batch();
     const {tx, hash} = wtx;
     const height = block ? block.height : -1;
@@ -1126,10 +1137,11 @@ class TXDB {
    * @private
    * @param {TXRecord} wtx
    * @param {BlockMeta} block
+   * @param {BlockExtraInfo} extra
    * @returns {Promise<Details>}
    */
 
-  async confirm(wtx, block) {
+  async confirm(wtx, block, extra) {
     const b = this.bucket.batch();
     const {tx, hash} = wtx;
     const height = block.height;
@@ -3423,6 +3435,12 @@ class Balance extends bio.Struct {
  */
 
 class BalanceDelta {
+  /** @type {Balance} */
+  wallet;
+
+  /** @type {Map<Number, Balance>} */
+  accounts;
+
   /**
    * Create a balance delta.
    * @constructor
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index 1d5a8ce79..fa2b31c72 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -40,6 +40,10 @@ const {BufferSet} = require('buffer-map');
 const Coin = require('../primitives/coin');
 const Outpoint = require('../primitives/outpoint');
 
+/** @typedef {import('./records').BlockMeta} BlockMeta */
+/** @typedef {import('../primitives/tx')} TX */
+/** @typedef {import('./txdb').BlockExtraInfo} BlockExtraInfo */
+
 /*
  * Constants
  */
@@ -4737,13 +4741,15 @@ class Wallet extends EventEmitter {
   /**
    * Add a transaction to the wallets TX history.
    * @param {TX} tx
+   * @param {BlockMeta} [block]
+   * @param {BlockExtraInfo} [extra]
    * @returns {Promise}
    */
 
-  async add(tx, block) {
+  async add(tx, block, extra) {
     const unlock = await this.writeLock.lock();
     try {
-      return await this._add(tx, block);
+      return await this._add(tx, block, extra);
     } finally {
       unlock();
     }
@@ -4754,11 +4760,13 @@ class Wallet extends EventEmitter {
    * Potentially resolves orphans.
    * @private
    * @param {TX} tx
+   * @param {BlockMeta} [block]
+   * @param {BlockExtraInfo} [extra]
    * @returns {Promise}
    */
 
-  async _add(tx, block) {
-    const details = await this.txdb.add(tx, block);
+  async _add(tx, block, extra) {
+    const details = await this.txdb.add(tx, block, extra);
 
     if (details) {
       const derived = await this.syncOutputDepth(tx);
diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index 467f419f5..0a163978a 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -40,6 +40,9 @@ const {
   MapRecord
 } = records;
 
+/** @typedef {import('./records').BlockMeta} BlockMeta */
+/** @typedef {import('./txdb').BlockExtraInfo} BlockExtraInfo */
+
 /**
  * WalletDB
  * @alias module:wallet.WalletDB
@@ -2458,10 +2461,17 @@ class WalletDB extends EventEmitter {
       // added and the height is updated.
       this.confirming = true;
 
+      const mtp = await this.getMedianTimeTip(tip.height - 1, tip.time);
+
       for (const tx of txs) {
-        if (await this._addTX(tx, tip)) {
+        /** @type {BlockExtraInfo} */
+        const extra = {
+          medianTime: mtp,
+          txIndex: walletTxs.length
+        };
+
+        if (await this._addTX(tx, tip, extra))
           walletTxs.push(tx);
-        }
       }
 
       // Sync the state to the new tip.
@@ -2611,11 +2621,12 @@ class WalletDB extends EventEmitter {
    * Add a transaction to the database without a lock.
    * @private
    * @param {TX} tx
-   * @param {BlockMeta} block
+   * @param {BlockMeta} [block]
+   * @param {BlockExtraInfo} [extra]
    * @returns {Promise}
    */
 
-  async _addTX(tx, block) {
+  async _addTX(tx, block, extra) {
     const wids = await this.getWalletsByTX(tx);
 
     assert(!tx.mutable, 'WDB: Cannot add mutable TX.');
@@ -2636,7 +2647,7 @@ class WalletDB extends EventEmitter {
 
       assert(wallet);
 
-      if (await wallet.add(tx, block)) {
+      if (await wallet.add(tx, block, extra)) {
         this.logger.info(
           'Added transaction to wallet in WalletDB: %s (%d).',
           wallet.id, wid);