diff --git a/models/certificate.js b/models/certificate.js
index b68d6df5..7fd1ca3a 100644
--- a/models/certificate.js
+++ b/models/certificate.js
@@ -34,7 +34,7 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER, TEXT, ARRAY, DECIMAL, D
         default: null,
       },
       amount: {
-        type   : STRING,
+        type   : DOUBLE,
         default: null,
       },
       claimId: {
@@ -54,7 +54,7 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER, TEXT, ARRAY, DECIMAL, D
         default: null,
       },
       effectiveAmount: {
-        type   : STRING,
+        type   : DOUBLE,
         default: null,
       },
       hasSignature: {
@@ -62,7 +62,7 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER, TEXT, ARRAY, DECIMAL, D
         default: null,
       },
       height: {
-        type   : STRING,
+        type   : INTEGER,
         default: null,
       },
       hex: {
@@ -82,7 +82,7 @@ module.exports = (sequelize, { STRING, BOOLEAN, INTEGER, TEXT, ARRAY, DECIMAL, D
         default: null,
       },
       validAtHeight: {
-        type   : STRING,
+        type   : INTEGER,
         default: null,
       },
       outpoint: {