diff --git a/migrations/V142__add_altcha_challenge_table.sql b/migrations/V142__add_altcha_challenge_table.sql
new file mode 100644
index 00000000..0265dbd1
--- /dev/null
+++ b/migrations/V142__add_altcha_challenge_table.sql
@@ -0,0 +1,7 @@
+CREATE TABLE altcha_challenge (
+  challenge VARCHAR(64) NOT NULL,
+  expires_at DATETIME NOT NULL,
+  PRIMARY KEY (challenge)
+);
+
+CREATE INDEX idx_altcha_challenge_expires_at ON altcha_challenge (expires_at);
\ No newline at end of file