diff --git a/docs/olm.rst b/docs/olm.rst
index e23b421..99417e0 100644
--- a/docs/olm.rst
+++ b/docs/olm.rst
@@ -216,7 +216,7 @@ payload followed by a fixed length message authentication code.
    | Version Byte | Payload Bytes                      | MAC Bytes |
    +--------------+------------------------------------+-----------+
 
-The version byte is ``"\x01"``.
+The version byte is ``"\x03"``.
 
 The payload consists of key-value pairs where the keys are integers and the
 values are integers and strings. The keys are encoded as a variable length
@@ -241,7 +241,7 @@ Cipher-Text  0x22 String   The cipher-text, :math:`X_{i,j}`, of the message
 =========== ===== ======== ================================================
 
 The length of the MAC is determined by the authenticated encryption algorithm
-being used. (Olm version 1 uses HMAC-SHA-256, giving a MAC of 32 bytes). The
+being used. (Olm version 1 uses HMAC-SHA-256, truncated to 8 bytes). The
 MAC protects all of the bytes preceding the MAC.
 
 Pre-Key Messages
@@ -256,7 +256,7 @@ length payload.
    | Version Byte | Payload Bytes                      |
    +--------------+------------------------------------+
 
-The version byte is ``"\x01"``.
+The version byte is ``"\x03"``.
 
 The payload uses the same key-value format as for normal messages.
 
@@ -280,9 +280,10 @@ Version 1
 ~~~~~~~~~
 
 Version 1 of Olm uses AES-256_ in CBC_ mode with `PCKS#7`_ padding for
-encryption and HMAC-SHA-256_ for authentication. The 256 bit AES key, 256 bit
-HMAC key, and 128 bit AES IV are derived from the message key using
-HKDF-SHA-256_ using the default salt and an info of ``"OLM_KEYS"``.
+encryption and HMAC-SHA-256_ (truncated to 64 bits) for authentication.  The
+256 bit AES key, 256 bit HMAC key, and 128 bit AES IV are derived from the
+message key using HKDF-SHA-256_ using the default salt and an info of
+``"OLM_KEYS"``.
 
 .. math::
 
@@ -295,7 +296,7 @@ The plain-text is encrypted with AES-256, using the key :math:`AES\_KEY_{i,j}`
 and the IV :math:`AES\_IV_{i,j}` to give the cipher-text, :math:`X_{i,j}`.
 
 Then the entire message (including the Version Byte and all Payload Bytes) are
-passed through HMAC-SHA-256, and the MAC is appended to the message.
+passed through HMAC-SHA-256. The first 8 bytes of the MAC are appended to the message.
 
 IPR
 ---
@@ -311,8 +312,8 @@ Acknowledgements
 ----------------
 
 The ratchet that Olm implements was designed by Trevor Perrin and Moxie
-Marlinspike - details at https://github.com/trevp/axolotl/wiki.  Olm is an
-entirely new implementation written by the Matrix.org team.
+Marlinspike - details at https://github.com/trevp/double_ratchet/wiki.  Olm is
+an entirely new implementation written by the Matrix.org team.
 
 .. _`Curve25519`: http://cr.yp.to/ecdh.html
 .. _`Triple Diffie-Hellman`: https://whispersystems.org/blog/simplifying-otr-deniability/
diff --git a/include/olm/crypto.hh b/include/olm/crypto.hh
index 159bac7..7a05f8d 100644
--- a/include/olm/crypto.hh
+++ b/include/olm/crypto.hh
@@ -17,7 +17,6 @@
 
 #include <cstdint>
 #include <cstddef>
-#include <string>
 
 namespace olm {
 
@@ -27,7 +26,6 @@ static const std::size_t IV_LENGTH = 16;
 
 struct Curve25519PublicKey {
     std::uint8_t public_key[KEY_LENGTH];
-    std::string to_string() const;
 };
 
 
diff --git a/include/olm/memory.hh b/include/olm/memory.hh
index 89afd99..74ff9f8 100644
--- a/include/olm/memory.hh
+++ b/include/olm/memory.hh
@@ -87,23 +87,4 @@ std::uint8_t * store_array(
     return destination + sizeof(T);
 }
 
-/** convert an array of bytes to a string representation */
-template<typename T>
-std::string bytes_to_string(T start, T end) {
-    std::ostringstream ss;
-    ss << std::hex << std::setfill('0');
-    while (start != end) {
-        ss << std::setw(2) << static_cast<int>(*start++);
-        if (start != end) {
-            ss << ":";
-        }
-    }
-    return ss.str();
-}
-
-template<typename T>
-std::string bytes_to_string(T start, size_t len) {
-    return bytes_to_string(start, start+len);
-}
-
 } // namespace olm
diff --git a/include/olm/olm.hh b/include/olm/olm.hh
index ffecb10..51d5c04 100644
--- a/include/olm/olm.hh
+++ b/include/olm/olm.hh
@@ -415,13 +415,6 @@ size_t olm_ed25519_verify(
     void * signature, size_t signature_length
 );
 
-/**
- * Set the log level. By default, 1, which logs only FATAL messages.
- */
-void olm_set_log_level(
-    unsigned int level
-);
-
 #ifdef __cplusplus
 }
 #endif
diff --git a/javascript/olm_post.js b/javascript/olm_post.js
index 36e7645..5173f7f 100644
--- a/javascript/olm_post.js
+++ b/javascript/olm_post.js
@@ -382,6 +382,4 @@ Utility.prototype['ed25519_verify'] = restore_stack(function(
 olm_exports["Account"] = Account;
 olm_exports["Session"] = Session;
 olm_exports["Utility"] = Utility;
-
-olm_exports['set_log_level'] = Module['_olm_set_log_level'];
 }();
diff --git a/src/crypto.cpp b/src/crypto.cpp
index 3801e93..da1d617 100644
--- a/src/crypto.cpp
+++ b/src/crypto.cpp
@@ -101,11 +101,6 @@ inline static void hmac_sha256_final(
 
 } // namespace
 
-std::string olm::Curve25519PublicKey::to_string() const {
-    return olm::bytes_to_string(std::begin(public_key),
-                                std::end(public_key));
-};
-
 void olm::curve25519_generate_key(
     std::uint8_t const * random_32_bytes,
     olm::Curve25519KeyPair & key_pair