diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index 6fbe780b..ff569465 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -17,7 +17,7 @@ jobs:
     permissions:
           contents: read
     
-    runs-on: macos-14
+    runs-on: macos-15
 
     steps:
     - uses: actions/checkout@a12a3943b4bdde767164f792f33f40b04645d846
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 47138a3a..0eb228bb 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,9 @@ and this library adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - `SDKSynchronizer.redactPCZTForSigner`: Decrease the size of a PCZT for sending to a signer.
 - `SDKSynchronizer.PCZTRequiresSaplingProofs`: Check whether the Sapling parameters are required for a given PCZT.
 
+## Updated
+- Methods returning an array of `ZcashTransaction.Overview` try to evaluate transaction's missing blockTime. This typically applies to an expired transaction.  
+
 # 2.2.8 - 2025-01-10
 
 ## Added
diff --git a/Sources/ZcashLightClientKit/DAO/BlockDao.swift b/Sources/ZcashLightClientKit/DAO/BlockDao.swift
new file mode 100644
index 00000000..0b3e6f94
--- /dev/null
+++ b/Sources/ZcashLightClientKit/DAO/BlockDao.swift
@@ -0,0 +1,65 @@
+//  BlockDao.swift
+//  ZcashLightClientKit
+//
+//  Created by Lukas Korba on 2025-01-25.
+//
+
+import Foundation
+import SQLite
+
+protocol BlockDao {
+    func block(at height: BlockHeight) throws -> Block?
+}
+
+struct Block: Codable {
+    enum CodingKeys: String, CodingKey {
+        case height
+        case time
+    }
+
+    enum TableStructure {
+        static let height = SQLite.Expression<Int>(Block.CodingKeys.height.rawValue)
+        static let time = SQLite.Expression<Int>(Block.CodingKeys.time.rawValue)
+    }
+
+    let height: BlockHeight
+    let time: Int
+    
+    static let table = Table("blocks")
+}
+
+class BlockSQLDAO: BlockDao {
+    let dbProvider: ConnectionProvider
+    let table: Table
+    let height = SQLite.Expression<Int>("height")
+
+    init(dbProvider: ConnectionProvider) {
+        self.dbProvider = dbProvider
+        self.table = Table("Blocks")
+    }
+
+    /// - Throws:
+    ///     - `blockDAOCantDecode` if block data loaded from DB can't be decoded to `Block` object.
+    ///     - `blockDAOBlock` if sqlite query to load block metadata failed.
+    func block(at height: BlockHeight) throws -> Block? {
+        do {
+            return try dbProvider
+                .connection()
+                .prepare(Block.table.filter(Block.TableStructure.height == height).limit(1))
+                .map {
+                    do {
+                        return try $0.decode()
+                    } catch {
+                        throw ZcashError.blockDAOCantDecode(error)
+                    }
+                }
+                .first
+        } catch {
+            if let error = error as? ZcashError {
+                throw error
+            } else {
+                throw ZcashError.blockDAOBlock(error)
+            }
+        }
+    }
+}
diff --git a/Sources/ZcashLightClientKit/DAO/TransactionDao.swift b/Sources/ZcashLightClientKit/DAO/TransactionDao.swift
index 70c12e49..31c81eb5 100644
--- a/Sources/ZcashLightClientKit/DAO/TransactionDao.swift
+++ b/Sources/ZcashLightClientKit/DAO/TransactionDao.swift
@@ -14,14 +14,22 @@ class TransactionSQLDAO: TransactionRepository {
         static let memo = SQLite.Expression<Blob>("memo")
     }
 
+    enum UserMetadata {
+        static let txid = SQLite.Expression<Blob>("txid")
+        static let memoCount = SQLite.Expression<Int>("memo_count")
+        static let memo = SQLite.Expression<String>("memo")
+    }
+
     let dbProvider: ConnectionProvider
     
+    private let blockDao: BlockSQLDAO
     private let transactionsView = View("v_transactions")
     private let txOutputsView = View("v_tx_outputs")
     private let traceClosure: ((String) -> Void)?
     
     init(dbProvider: ConnectionProvider, traceClosure: ((String) -> Void)? = nil) {
         self.dbProvider = dbProvider
+        self.blockDao = BlockSQLDAO(dbProvider: dbProvider)
         self.traceClosure = traceClosure
     }
 
@@ -38,7 +46,49 @@ class TransactionSQLDAO: TransactionRepository {
     func isInitialized() async throws -> Bool {
         true
     }
+
+    func resolveMissingBlockTimes(for transactions: [ZcashTransaction.Overview]) async throws -> [ZcashTransaction.Overview] {
+        var transactionsCopy = transactions
+        
+        for i in 0..<transactions.count {
+            let transaction = transactions[i]
+            
+            guard transaction.blockTime == nil else {
+                continue
+            }
+            
+            if let expiryHeight = transaction.expiryHeight {
+                if let block = try await blockForHeight(expiryHeight) {
+                    transactionsCopy[i].blockTime = TimeInterval(block.time)
+                }
+            }
+        }
+        
+        return transactionsCopy
+    }
     
+    @DBActor
+    func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data] {
+        let query = transactionsView
+            .join(txOutputsView, on: transactionsView[UserMetadata.txid] == txOutputsView[UserMetadata.txid])
+            .filter(transactionsView[UserMetadata.memoCount] > 0)
+            .filter(txOutputsView[UserMetadata.memo].like("%\(searchTerm)%"))
+
+        var txids: [Data] = []
+        for row in try connection().prepare(query) {
+            let txidBlob = try row.get(txOutputsView[UserMetadata.txid])
+            let txid = Data(blob: txidBlob)
+            txids.append(txid)
+        }
+        
+        return txids
+    }
+    
+    @DBActor
+    func blockForHeight(_ height: BlockHeight) async throws -> Block? {
+        try blockDao.block(at: height)
+    }
+
     @DBActor
     func countAll() async throws -> Int {
         do {
@@ -71,7 +121,9 @@ class TransactionSQLDAO: TransactionRepository {
             .filterQueryFor(kind: kind)
             .limit(limit, offset: offset)
 
-        return try await execute(query) { try ZcashTransaction.Overview(row: $0) }
+        let transactions: [ZcashTransaction.Overview] = try await execute(query) { try ZcashTransaction.Overview(row: $0) }
+
+        return try await resolveMissingBlockTimes(for: transactions)
     }
 
     func find(in range: CompactBlockRange, limit: Int, kind: TransactionKind) async throws -> [ZcashTransaction.Overview] {
diff --git a/Sources/ZcashLightClientKit/Entity/TransactionEntity.swift b/Sources/ZcashLightClientKit/Entity/TransactionEntity.swift
index f18be4a8..f86d5541 100644
--- a/Sources/ZcashLightClientKit/Entity/TransactionEntity.swift
+++ b/Sources/ZcashLightClientKit/Entity/TransactionEntity.swift
@@ -9,7 +9,7 @@ import Foundation
 import SQLite
 
 public enum ZcashTransaction {
-    public struct Overview {
+    public struct Overview: Equatable, Identifiable {
         /// Represents the transaction state based on current height of the chain,
         /// mined height and expiry height of a transaction.
         public enum State {
@@ -43,9 +43,11 @@ public enum ZcashTransaction {
                 }
             }
         }
+        
+        public var id: Data { rawID }
 
         public let accountUUID: AccountUUID
-        public let blockTime: TimeInterval?
+        public var blockTime: TimeInterval?
         public let expiryHeight: BlockHeight?
         public let fee: Zatoshi?
         public let index: Int?
@@ -62,8 +64,8 @@ public enum ZcashTransaction {
         public let isExpiredUmined: Bool?
     }
 
-    public struct Output {
-        public enum Pool {
+    public struct Output: Equatable, Identifiable {
+        public enum Pool: Equatable {
             case transaparent
             case sapling
             case orchard
@@ -82,6 +84,8 @@ public enum ZcashTransaction {
             }
         }
 
+        public var id: Data { rawID }
+
         public let rawID: Data
         public let pool: Pool
         public let index: Int
@@ -93,7 +97,7 @@ public enum ZcashTransaction {
     }
 
     /// Used when fetching blocks from the lightwalletd
-    struct Fetched {
+    struct Fetched: Equatable {
         public let rawID: Data
         public let minedHeight: UInt32?
         public let raw: Data
diff --git a/Sources/ZcashLightClientKit/Repository/TransactionRepository.swift b/Sources/ZcashLightClientKit/Repository/TransactionRepository.swift
index 20d9c83f..8abdb4e4 100644
--- a/Sources/ZcashLightClientKit/Repository/TransactionRepository.swift
+++ b/Sources/ZcashLightClientKit/Repository/TransactionRepository.swift
@@ -12,6 +12,7 @@ protocol TransactionRepository {
     func countAll() async throws -> Int
     func countUnmined() async throws -> Int
     func isInitialized() async throws -> Bool
+    func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data]
     func find(rawID: Data) async throws -> ZcashTransaction.Overview
     func find(offset: Int, limit: Int, kind: TransactionKind) async throws -> [ZcashTransaction.Overview]
     func find(in range: CompactBlockRange, limit: Int, kind: TransactionKind) async throws -> [ZcashTransaction.Overview]
diff --git a/Sources/ZcashLightClientKit/Synchronizer.swift b/Sources/ZcashLightClientKit/Synchronizer.swift
index ac03a880..509e13be 100644
--- a/Sources/ZcashLightClientKit/Synchronizer.swift
+++ b/Sources/ZcashLightClientKit/Synchronizer.swift
@@ -72,7 +72,7 @@ public enum SynchronizerEvent {
     case minedTransaction(ZcashTransaction.Overview)
 
     // Sent when the synchronizer finds a mined transaction
-    case foundTransactions(_ transactions: [ZcashTransaction.Overview], _ inRange: CompactBlockRange)
+    case foundTransactions(_ transactions: [ZcashTransaction.Overview], _ inRange: CompactBlockRange?)
     // Sent when the synchronizer fetched utxos from lightwalletd attempted to store them.
     case storedUTXOs(_ inserted: [UnspentTransactionOutputEntity], _ skipped: [UnspentTransactionOutputEntity])
     // Connection state to LightwalletEndpoint changed.
@@ -355,6 +355,8 @@ public protocol Synchronizer: AnyObject {
         keySource: String?
     ) async throws -> AccountUUID
     
+    func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data]
+
     /// Rescans the known blocks with the current keys.
     ///
     /// `rewind(policy:)` can be called anytime. If the sync process is in progress then it is stopped first. In this case, it make some significant
diff --git a/Sources/ZcashLightClientKit/Synchronizer/SDKSynchronizer.swift b/Sources/ZcashLightClientKit/Synchronizer/SDKSynchronizer.swift
index bd0372dc..a1b8e9ae 100644
--- a/Sources/ZcashLightClientKit/Synchronizer/SDKSynchronizer.swift
+++ b/Sources/ZcashLightClientKit/Synchronizer/SDKSynchronizer.swift
@@ -250,6 +250,8 @@ public class SDKSynchronizer: Synchronizer {
     }
 
     private func foundTransactions(transactions: [ZcashTransaction.Overview], in range: CompactBlockRange) {
+        guard !transactions.isEmpty else { return }
+        
         streamsUpdateQueue.async { [weak self] in
             self?.eventSubject.send(.foundTransactions(transactions, range))
         }
@@ -379,6 +381,11 @@ public class SDKSynchronizer: Synchronizer {
         var iterator = transactions.makeIterator()
         var submitFailed = false
 
+        // let clients know the transaction repository changed
+        if !transactions.isEmpty {
+            eventSubject.send(.foundTransactions(transactions, nil))
+        }
+        
         return AsyncThrowingStream() {
             guard let transaction = iterator.next() else { return nil }
 
@@ -447,6 +454,10 @@ public class SDKSynchronizer: Synchronizer {
         return submitTransactions(transactions)
     }
 
+    public func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data] {
+        try await transactionRepository.fetchTxidsWithMemoContaining(searchTerm: searchTerm)
+    }
+    
     public func allReceivedTransactions() async throws -> [ZcashTransaction.Overview] {
         try await transactionRepository.findReceived(offset: 0, limit: Int.max)
     }
diff --git a/Tests/TestUtils/MockTransactionRepository.swift b/Tests/TestUtils/MockTransactionRepository.swift
index 7504238a..158cef84 100644
--- a/Tests/TestUtils/MockTransactionRepository.swift
+++ b/Tests/TestUtils/MockTransactionRepository.swift
@@ -73,6 +73,10 @@ extension MockTransactionRepository.Kind: Equatable {}
 
 // MARK: - TransactionRepository
 extension MockTransactionRepository: TransactionRepository {
+    func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data] {
+        []
+    }
+    
     func findForResubmission(upTo: ZcashLightClientKit.BlockHeight) async throws -> [ZcashLightClientKit.ZcashTransaction.Overview] {
         []
     }
diff --git a/Tests/TestUtils/Sourcery/GeneratedMocks/AutoMockable.generated.swift b/Tests/TestUtils/Sourcery/GeneratedMocks/AutoMockable.generated.swift
index 39d34d94..72af0b83 100644
--- a/Tests/TestUtils/Sourcery/GeneratedMocks/AutoMockable.generated.swift
+++ b/Tests/TestUtils/Sourcery/GeneratedMocks/AutoMockable.generated.swift
@@ -1947,6 +1947,30 @@ class SynchronizerMock: Synchronizer {
         }
     }
 
+    // MARK: - fetchTxidsWithMemoContaining
+
+    var fetchTxidsWithMemoContainingSearchTermThrowableError: Error?
+    var fetchTxidsWithMemoContainingSearchTermCallsCount = 0
+    var fetchTxidsWithMemoContainingSearchTermCalled: Bool {
+        return fetchTxidsWithMemoContainingSearchTermCallsCount > 0
+    }
+    var fetchTxidsWithMemoContainingSearchTermReceivedSearchTerm: String?
+    var fetchTxidsWithMemoContainingSearchTermReturnValue: [Data]!
+    var fetchTxidsWithMemoContainingSearchTermClosure: ((String) async throws -> [Data])?
+
+    func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data] {
+        if let error = fetchTxidsWithMemoContainingSearchTermThrowableError {
+            throw error
+        }
+        fetchTxidsWithMemoContainingSearchTermCallsCount += 1
+        fetchTxidsWithMemoContainingSearchTermReceivedSearchTerm = searchTerm
+        if let closure = fetchTxidsWithMemoContainingSearchTermClosure {
+            return try await closure(searchTerm)
+        } else {
+            return fetchTxidsWithMemoContainingSearchTermReturnValue
+        }
+    }
+
     // MARK: - rewind
 
     var rewindCallsCount = 0
@@ -2135,6 +2159,30 @@ class TransactionRepositoryMock: TransactionRepository {
         }
     }
 
+    // MARK: - fetchTxidsWithMemoContaining
+
+    var fetchTxidsWithMemoContainingSearchTermThrowableError: Error?
+    var fetchTxidsWithMemoContainingSearchTermCallsCount = 0
+    var fetchTxidsWithMemoContainingSearchTermCalled: Bool {
+        return fetchTxidsWithMemoContainingSearchTermCallsCount > 0
+    }
+    var fetchTxidsWithMemoContainingSearchTermReceivedSearchTerm: String?
+    var fetchTxidsWithMemoContainingSearchTermReturnValue: [Data]!
+    var fetchTxidsWithMemoContainingSearchTermClosure: ((String) async throws -> [Data])?
+
+    func fetchTxidsWithMemoContaining(searchTerm: String) async throws -> [Data] {
+        if let error = fetchTxidsWithMemoContainingSearchTermThrowableError {
+            throw error
+        }
+        fetchTxidsWithMemoContainingSearchTermCallsCount += 1
+        fetchTxidsWithMemoContainingSearchTermReceivedSearchTerm = searchTerm
+        if let closure = fetchTxidsWithMemoContainingSearchTermClosure {
+            return try await closure(searchTerm)
+        } else {
+            return fetchTxidsWithMemoContainingSearchTermReturnValue
+        }
+    }
+
     // MARK: - find
 
     var findRawIDThrowableError: Error?