diff --git a/Swift/BRCore/BREthereum.swift b/Swift/BRCore/BREthereum.swift
index f43b6a757..4b0e79d8e 100644
--- a/Swift/BRCore/BREthereum.swift
+++ b/Swift/BRCore/BREthereum.swift
@@ -610,7 +610,7 @@ public protocol EthereumClient : class {
 
     func getBlocks (ewm: EthereumWalletManager,
                     address: String,
-                    flags: Int32,
+                    interests: Int32,
                     blockStart: UInt64,
                     blockStop: UInt64,
                     rid: Int32) -> Void
@@ -860,6 +860,12 @@ public class EthereumWalletManager {
         cTopics.forEach { free (UnsafeMutablePointer(mutating: $0)) }
     }
 
+    public func announceBlocks (rid: Int32,
+                                blockNumbers: [UInt64]) {
+        // TODO: blocks must be BRArrayOf(uint64_t) - change to add `count`
+        ethereumClientAnnounceBlocks(core, rid, UnsafeMutablePointer<UInt64>(mutating: blockNumbers))
+    }
+
     public func announceToken (rid: Int32,
                                address: String,
                                symbol: String,
@@ -947,12 +953,12 @@ public class EthereumWalletManager {
                                     rid: rid)
                 }},
 
-            funcGetBlocks: { (coreClient, coreEWM, address, flags, blockStart, blockStop, rid) in
+            funcGetBlocks: { (coreClient, coreEWM, address, interests, blockStart, blockStop, rid) in
                 if let client = coreClient.map ({ Unmanaged<AnyEthereumClient>.fromOpaque($0).takeUnretainedValue() }),
                     let ewm = EthereumWalletManager.lookup(core: coreEWM) {
                     client.getBlocks (ewm: ewm,
                                       address: asUTF8String (address!),
-                                      flags: flags,
+                                      interests: interests,
                                       blockStart: blockStart,
                                       blockStop: blockStop,
                                       rid: rid)
@@ -1241,8 +1247,8 @@ class AnyEthereumClient : EthereumClient {
         base.getLogs(ewm: ewm, address: address, event: event, rid: rid)
     }
 
-    func getBlocks (ewm: EthereumWalletManager, address: String, flags: Int32, blockStart: UInt64, blockStop: UInt64,  rid: Int32) {
-        base.getBlocks (ewm: ewm, address: address, flags: flags, blockStart: blockStart, blockStop: blockStop, rid: rid)
+    func getBlocks (ewm: EthereumWalletManager, address: String, interests: Int32, blockStart: UInt64, blockStop: UInt64,  rid: Int32) {
+        base.getBlocks (ewm: ewm, address: address, interests: interests, blockStart: blockStart, blockStop: blockStop, rid: rid)
     }
 
     func getTokens (ewm: EthereumWalletManager, rid: Int32) {
diff --git a/Swift/CoreDemo/CoreDemoEthereumClient.swift b/Swift/CoreDemo/CoreDemoEthereumClient.swift
index 84e333a9b..040a72ab5 100644
--- a/Swift/CoreDemo/CoreDemoEthereumClient.swift
+++ b/Swift/CoreDemo/CoreDemoEthereumClient.swift
@@ -98,6 +98,49 @@ class CoreDemoEthereumClient : EthereumClient {
         return
     }
 
+    func getBlocks(ewm: EthereumWalletManager, address: String, interests: Int32, blockStart: UInt64, blockStop: UInt64, rid: Int32) {
+        var blockNumbers : [UInt64] = []
+        if "0xb302B06FDB1348915599D21BD54A06832637E5E8" == address {
+            if 0 != interests & Int32 (1 << 3) /* CLIENT_GET_BLOCKS_LOGS_AS_TARGET */ {
+                blockNumbers += [4847049,
+                                 4847152,
+                                 4894677,
+                                 4965538,
+                                 4999850,
+                                 5029844]
+            }
+
+            if 0 != interests & Int32 (1 << 2) /* CLIENT_GET_BLOCKS_LOGS_AS_SOURCE */ {
+                blockNumbers += [5705175]
+            }
+
+            if 0 != interests & Int32 (1 << 1) /* CLIENT_GET_BLOCKS_TRANSACTIONS_AS_TARGET */ {
+                blockNumbers += [4894027,
+                                 4908682,
+                                 4991227]
+            }
+
+            if 0 != interests & Int32 (1 << 0) /* CLIENT_GET_BLOCKS_TRANSACTIONS_AS_SOURCE */ {
+                blockNumbers += [4894330,
+                4894641,
+                4894677,
+                4903993,
+                4906377,
+                4997449,
+                4999850,
+                4999875,
+                5000000,
+                5705175]
+            }
+        }
+        else {
+            blockNumbers.append(contentsOf: [blockStart,
+                                             (blockStart + blockStop) / 2,
+                                                blockStop])
+        }
+        ewm.announceBlocks(rid: rid, blockNumbers: blockNumbers)
+    }
+
     func getTokens(ewm: EthereumWalletManager, rid: Int32) {
         ewm.announceToken (rid: rid,
                            address: (ewm.network == EthereumNetwork.mainnet