diff --git a/README.md b/README.md
index e42fa2d..ea5b434 100644
--- a/README.md
+++ b/README.md
@@ -170,7 +170,7 @@ Any of the following FATE API data types can be encoded and decoded:
 - oracle_query_id
 - peer_pubkey
 - name
-- transaction_hash
+- tx_hash
 - signature
 - commitment
 - bytearray
diff --git a/src/ApiEncoder.js b/src/ApiEncoder.js
index 9e05e45..4f59fe7 100644
--- a/src/ApiEncoder.js
+++ b/src/ApiEncoder.js
@@ -17,7 +17,7 @@ const TYPES = {
     oracle_query_id: {tag: 'oq', size: 32, encoder: base58check},
     peer_pubkey: {tag: 'pp', size: 32, encoder: base58check},
     name: {tag: 'nm', size: 0, encoder: base58check},
-    transaction_hash: {tag: 'th', size: 32, encoder: base58check},
+    tx_hash: {tag: 'th', size: 32, encoder: base58check},
     signature: {tag: 'sg', size: 64, encoder: base58check},
     commitment: {tag: 'cm', size: 32, encoder: base58check},
     bytearray: {tag: 'ba', size: 0, encoder: base64check},
@@ -37,7 +37,7 @@ const TAG2TYPE = {
     oq: 'oracle_query_id',
     pp: 'peer_pubkey',
     nm: 'name',
-    th: 'transaction_hash',
+    th: 'tx_hash',
     sg: 'signature',
     cm: 'commitment',
     ba: 'bytearray',
diff --git a/tests/ApiEncoder.js b/tests/ApiEncoder.js
index 41f694b..581b59a 100644
--- a/tests/ApiEncoder.js
+++ b/tests/ApiEncoder.js
@@ -75,7 +75,7 @@ test('Encode', t => {
     )
 
     t.deepEqual(
-        encoder.encode('transaction_hash', payload),
+        encoder.encode('tx_hash', payload),
         'th_16qJFWMMHFy3xDdLmvUeyc2S6FrWRhJP51HsvDYdz9d1FsYG'
     )