diff --git a/src/Contacts/TSThread.h b/src/Contacts/TSThread.h
index 4cf517658..1a433684c 100644
--- a/src/Contacts/TSThread.h
+++ b/src/Contacts/TSThread.h
@@ -36,6 +36,11 @@ NS_ASSUME_NONNULL_BEGIN
  */
 - (nullable NSString *)contactIdentifier;
 
+/**
+ * @returns recipientId for each recipient in the thread
+ */
+@property (nonatomic, readonly) NSArray<NSString *> *recipientIdentifiers;
+
 #if TARGET_OS_IOS
 
 /**
diff --git a/src/Contacts/TSThread.m b/src/Contacts/TSThread.m
index ccdfc564c..97d21d2c4 100644
--- a/src/Contacts/TSThread.m
+++ b/src/Contacts/TSThread.m
@@ -84,6 +84,12 @@ NS_ASSUME_NONNULL_BEGIN
     return nil;
 }
 
+- (NSArray<NSString *> *)recipientIdentifiers
+{
+    NSAssert(FALSE, @"Should be implemented in subclasses");
+    return @[];
+}
+
 - (nullable UIImage *)image
 {
     return nil;
diff --git a/src/Contacts/Threads/TSContactThread.m b/src/Contacts/Threads/TSContactThread.m
index 78c51e82c..47875cb81 100644
--- a/src/Contacts/Threads/TSContactThread.m
+++ b/src/Contacts/Threads/TSContactThread.m
@@ -80,6 +80,11 @@ NS_ASSUME_NONNULL_BEGIN
     return [[self class] contactIdFromThreadId:self.uniqueId];
 }
 
+- (NSArray<NSString *> *)recipientIdentifiers
+{
+    return @[self.contactIdentifier];
+}
+
 - (BOOL)isGroupThread {
     return false;
 }
diff --git a/src/Contacts/Threads/TSGroupThread.m b/src/Contacts/Threads/TSGroupThread.m
index 2dadd57b0..4bcef274b 100644
--- a/src/Contacts/Threads/TSGroupThread.m
+++ b/src/Contacts/Threads/TSGroupThread.m
@@ -6,6 +6,7 @@
 #import "NSData+Base64.h"
 #import "SignalRecipient.h"
 #import "TSAttachmentStream.h"
+#import <SignalServiceKit/TSAccountManager.h>
 #import <YapDatabase/YapDatabaseConnection.h>
 #import <YapDatabase/YapDatabaseTransaction.h>
 
@@ -86,6 +87,18 @@ NS_ASSUME_NONNULL_BEGIN
     return [NSData dataFromBase64String:[threadId substringWithRange:NSMakeRange(1, threadId.length - 1)]];
 }
 
+- (NSArray<NSString *> *)recipientIdentifiers
+{
+    NSMutableArray<NSString *> *groupMemberIds = [self.groupModel.groupMemberIds mutableCopy];
+    if (groupMemberIds == nil) {
+        return @[];
+    }
+
+    [groupMemberIds removeObject:[TSAccountManager localNumber]];
+
+    return [groupMemberIds copy];
+}
+
 // Group and Contact threads share a collection, this is a convenient way to enumerate *just* the group threads
 + (void)enumerateGroupThreadsUsingBlock:(void (^)(TSGroupThread *groupThread, BOOL *stop))block
 {
diff --git a/src/Network/API/Requests/OWSGetProfileRequest.h b/src/Network/API/Requests/OWSGetProfileRequest.h
new file mode 100644
index 000000000..d23442d3c
--- /dev/null
+++ b/src/Network/API/Requests/OWSGetProfileRequest.h
@@ -0,0 +1,15 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
+#import "TSRequest.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface OWSGetProfileRequest : TSRequest
+
+- (instancetype)initWithRecipientId:(NSString *)recipientId;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/src/Network/API/Requests/OWSGetProfileRequest.m b/src/Network/API/Requests/OWSGetProfileRequest.m
new file mode 100644
index 000000000..8def49234
--- /dev/null
+++ b/src/Network/API/Requests/OWSGetProfileRequest.m
@@ -0,0 +1,31 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
+#import "OWSGetProfileRequest.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+NSString *const OWSProfileRequestPathFormat = @"v1/profile/%@";
+
+@implementation OWSGetProfileRequest
+
+- (instancetype)initWithRecipientId:(NSString *)recipientId
+{
+    OWSAssert(recipientId.length > 0);
+
+    NSString *path =[NSString stringWithFormat:OWSProfileRequestPathFormat, recipientId];
+    self = [super initWithURL:[NSURL URLWithString:path]];
+    if (!self) {
+        return self;
+    }
+    
+    self.HTTPMethod = @"GET";
+    self.parameters = nil;
+    
+    return self;
+}
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/src/Storage/TSStorageManager+keyingMaterial.m b/src/Storage/TSStorageManager+keyingMaterial.m
index e0be87119..b12728ad9 100644
--- a/src/Storage/TSStorageManager+keyingMaterial.m
+++ b/src/Storage/TSStorageManager+keyingMaterial.m
@@ -1,9 +1,5 @@
 //
-//  TSStorageManager+keyingMaterial.m
-//  TextSecureKit
-//
-//  Created by Frederic Jacobs on 06/11/14.
-//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
 //
 
 #import "TSStorageManager+keyingMaterial.h"
@@ -17,6 +13,7 @@
 
 - (NSString *)localNumber
 {
+    // TODO cache this? It only changes once, ever, and otherwise causes "surprising" transactions to occur.
     return [self stringForKey:TSStorageRegisteredNumberKey inCollection:TSStorageUserAccountCollection];
 }