diff --git a/onionr/blockimporter.py b/onionr/blockimporter.py
index 758633d9..a0de48c6 100755
--- a/onionr/blockimporter.py
+++ b/onionr/blockimporter.py
@@ -26,16 +26,16 @@ def importBlockFromData(content):
     blacklist = onionrblacklist.OnionrBlackList()
     retData = False
 
-    dataHash = crypto.hashers.sha3_hash(content)
-
-    if blacklist.inBlacklist(dataHash):
-        raise onionrexceptions.BlacklistedBlock('%s is a blacklisted block' % (dataHash,))
-
     try:
         content = content.encode()
     except AttributeError:
         pass
 
+    dataHash = crypto.hashers.sha3_hash(content)
+
+    if blacklist.inBlacklist(dataHash):
+        raise onionrexceptions.BlacklistedBlock('%s is a blacklisted block' % (dataHash,))
+
     metas = blockmetadata.get_block_metadata_from_data(content) # returns tuple(metadata, meta), meta is also in metadata
     metadata = metas[0]
     if validatemetadata.validate_metadata(metadata, metas[2]): # check if metadata is valid
@@ -49,4 +49,6 @@ def importBlockFromData(content):
                 blockmetadb.add_to_block_DB(blockHash, dataSaved=True)
                 blockmetadata.process_block_metadata(blockHash) # caches block metadata values to block database
                 retData = True
+        else:
+            raise onionrexceptions.InvalidProof
     return retData
\ No newline at end of file
diff --git a/onionr/communicatorutils/uploadblocks.py b/onionr/communicatorutils/uploadblocks.py
index 221089e2..647b4943 100755
--- a/onionr/communicatorutils/uploadblocks.py
+++ b/onionr/communicatorutils/uploadblocks.py
@@ -44,19 +44,22 @@ def upload_blocks_from_communicator(comm_inst):
                 triedPeers.append(peer)
                 url = 'http://' + peer + '/upload'
                 try:
-                    data = {'block': block.Block(bl).getRaw()}
+                    #data = {'block': block.Block(bl).getRaw()}
+                    data = block.Block(bl).getRaw()
                 except onionrexceptions.NoDataAvailable:
                     finishedUploads.append(bl)
                     break
                 proxyType = proxypicker.pick_proxy(peer)
                 logger.info("Uploading block %s to %s" % (bl[:8], peer), terminal=True)
-                resp = basicrequests.do_post_request(url, data=data, proxyType=proxyType)
+                resp = basicrequests.do_post_request(url, data=data, proxyType=proxyType, content_type='application/octet-stream')
                 if not resp == False:
                     if resp == 'success':
                         localcommand.local_command('waitforshare/' + bl, post=True)
                         finishedUploads.append(bl)
                     elif resp == 'exists':
                         finishedUploads.append(bl)
+                    else:
+                        logger.warn('Failed to upload %s, reason: %s' % (bl[:8], resp[:150]), terminal=True)
     for x in finishedUploads:
         try:
             comm_inst.blocksToUpload.remove(x)
diff --git a/onionr/httpapi/miscpublicapi/upload.py b/onionr/httpapi/miscpublicapi/upload.py
index 9328f270..2c8f5224 100755
--- a/onionr/httpapi/miscpublicapi/upload.py
+++ b/onionr/httpapi/miscpublicapi/upload.py
@@ -22,25 +22,25 @@ from flask import Response, abort
 import blockimporter, onionrexceptions, logger
 def accept_upload(request):
     resp = 'failure'
-    try:
-        data = request.form['block']
-    except KeyError:
-        logger.warn('No block specified for upload')
-        pass
-    else:
-        if sys.getsizeof(data) < 100000000:
-            try:
-                if blockimporter.importBlockFromData(data):
-                    resp = 'success'
-                else:
-                    resp = 'failure'
-                    logger.warn('Error encountered importing uploaded block')
-            except onionrexceptions.BlacklistedBlock:
-                logger.debug('uploaded block is blacklisted')
+    data = request.get_data()
+    if sys.getsizeof(data) < 100000000:
+        try:
+            if blockimporter.importBlockFromData(data):
+                resp = 'success'
+            else:
                 resp = 'failure'
-            except onionrexceptions.DataExists:
-                resp = 'exists'
+                logger.warn('Error encountered importing uploaded block')
+        except onionrexceptions.BlacklistedBlock:
+            logger.debug('uploaded block is blacklisted')
+            resp = 'failure'
+        except onionrexceptions.InvalidProof:
+            resp = 'proof'
+        except onionrexceptions.DataExists:
+            resp = 'exists'
     if resp == 'failure':
         abort(400)
-    resp = Response(resp)
+    elif resp == 'proof':
+        resp = Response(resp, 400)
+    else:
+        resp = Response(resp)
     return resp
\ No newline at end of file
diff --git a/onionr/onionrutils/basicrequests.py b/onionr/onionrutils/basicrequests.py
index 22913b6b..13d65769 100644
--- a/onionr/onionrutils/basicrequests.py
+++ b/onionr/onionrutils/basicrequests.py
@@ -21,7 +21,7 @@ import requests, streamedrequests
 import logger, onionrexceptions
 from etc import onionrvalues
 from . import localcommand
-def do_post_request(url, data={}, port=0, proxyType='tor', max_size=10000):
+def do_post_request(url, data={}, port=0, proxyType='tor', max_size=10000, content_type: str = ''):
     '''
     Do a POST request through a local tor or i2p instance
     '''
@@ -34,6 +34,8 @@ def do_post_request(url, data={}, port=0, proxyType='tor', max_size=10000):
     else:
         return
     headers = {'User-Agent': 'PyOnionr', 'Connection':'close'}
+    if len(content_type) > 0:
+        headers['Content-Type'] = content_type
     try:
         proxies = {'http': 'socks4a://127.0.0.1:' + str(port), 'https': 'socks4a://127.0.0.1:' + str(port)}
         #r = requests.post(url, data=data, headers=headers, proxies=proxies, allow_redirects=False, timeout=(15, 30))