diff --git a/ChangeLog b/ChangeLog
index c757c07..d27398b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -7,6 +7,7 @@ UNRELEASED Version 0.7.0
     - For dknewkey.py make default to include h=sha256 in the DNS record to
       exclude usage with sha1.  Can be overriden.
     - Update ARC processing to current draft.
+    - Fix arcverify tag requirements (LP: #1710312)
 
 2017-05-30 Version 0.6.2
     - Fixed problem with header folding that caused the first line to be
diff --git a/dkim/__init__.py b/dkim/__init__.py
index 03a6e81..aa3cfbe 100644
--- a/dkim/__init__.py
+++ b/dkim/__init__.py
@@ -1019,7 +1019,7 @@ class ARC(DomainSigner):
 
     self.logger.debug("ams sig[%d]: %r" % (instance, sig))
 
-    validate_signature_fields(sig, [b'i', b'a', b'b', b'c', b'bh', b'd', b'h', b's'], True)
+    validate_signature_fields(sig, [b'i', b'a', b'b', b'bh', b'd', b'h', b's'], True)
     output['ams-domain'] = sig[b'd']
     output['ams-selector'] = sig[b's']
 
@@ -1052,7 +1052,7 @@ class ARC(DomainSigner):
 
     self.logger.debug("as sig[%d]: %r" % (instance, sig))
 
-    validate_signature_fields(sig, [b'i', b'a', b'b', b'cv', b'd', b's', b't'], True)
+    validate_signature_fields(sig, [b'i', b'a', b'b', b'cv', b'd', b's'], True)
     output['as-domain'] = sig[b'd']
     output['as-selector'] = sig[b's']
     output['cv'] = sig[b'cv']