diff --git a/core/src/main/kotlin/net/corda/core/contracts/AttachmentConstraint.kt b/core/src/main/kotlin/net/corda/core/contracts/AttachmentConstraint.kt
index 0540933683..a11956fa79 100644
--- a/core/src/main/kotlin/net/corda/core/contracts/AttachmentConstraint.kt
+++ b/core/src/main/kotlin/net/corda/core/contracts/AttachmentConstraint.kt
@@ -117,10 +117,11 @@ object AutomaticPlaceholderConstraint : AttachmentConstraint {
  */
 @KeepForDJVM
 data class SignatureAttachmentConstraint(val key: PublicKey) : AttachmentConstraint {
-    override fun isSatisfiedBy(attachment: Attachment): Boolean {
+    override fun isSatisfiedBy(attachment: Attachment) = isSatisfiedBy(attachment, disableWarnings = false)
+    fun isSatisfiedBy(attachment: Attachment, disableWarnings: Boolean): Boolean {
         log.debug("Checking signature constraints: verifying $key in contract attachment signer keys: ${attachment.signerKeys}")
         return if (!key.isFulfilledBy(attachment.signerKeys.map { it })) {
-            log.warn("Untrusted signing key: expected $key. but contract attachment contains ${attachment.signerKeys}")
+            if (!disableWarnings) log.warn("Untrusted signing key: expected $key. but contract attachment contains ${attachment.signerKeys}")
             false
         } else true
     }
@@ -135,3 +136,11 @@ data class SignatureAttachmentConstraint(val key: PublicKey) : AttachmentConstra
         fun create(key: PublicKey) = interner.intern(SignatureAttachmentConstraint(key))
     }
 }
+
+fun isSatisfiedByWithNoWarnForSigConstraint(constraint: AttachmentConstraint, attachment: Attachment): Boolean {
+    return if (constraint is SignatureAttachmentConstraint) {
+        constraint.isSatisfiedBy(attachment, true)
+    } else {
+        constraint.isSatisfiedBy(attachment)
+    }
+}
diff --git a/core/src/main/kotlin/net/corda/core/internal/TransactionVerifierServiceInternal.kt b/core/src/main/kotlin/net/corda/core/internal/TransactionVerifierServiceInternal.kt
index 74cb1577f5..c0a922b911 100644
--- a/core/src/main/kotlin/net/corda/core/internal/TransactionVerifierServiceInternal.kt
+++ b/core/src/main/kotlin/net/corda/core/internal/TransactionVerifierServiceInternal.kt
@@ -32,6 +32,7 @@ import net.corda.core.contracts.TransactionVerificationException.TransactionMiss
 import net.corda.core.contracts.TransactionVerificationException.TransactionNonMatchingEncumbranceException
 import net.corda.core.contracts.TransactionVerificationException.TransactionNotaryMismatchEncumbranceException
 import net.corda.core.contracts.TransactionVerificationException.TransactionRequiredContractUnspecifiedException
+import net.corda.core.contracts.isSatisfiedByWithNoWarnForSigConstraint
 import net.corda.core.crypto.CompositeKey
 import net.corda.core.crypto.SecureHash
 import net.corda.core.internal.rules.StateContractValidationEnforcementRule
@@ -430,7 +431,7 @@ private class Validator(private val ltx: LedgerTransaction, private val transact
 
             if (HashAttachmentConstraint.disableHashConstraints && constraint is HashAttachmentConstraint)
                 logger.warnOnce("Skipping hash constraints verification.")
-            else if (!constraint.isSatisfiedBy(constraintAttachment)) {
+            else if (!isSatisfiedByWithNoWarnForSigConstraint(constraint, constraintAttachment)) {
                 verifyConstraintUsingRotatedKeys(constraint, constraintAttachment, contract)
             }
         }
diff --git a/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt b/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt
index daeb6afa0d..b61adc8d07 100644
--- a/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt
+++ b/core/src/main/kotlin/net/corda/core/transactions/TransactionBuilder.kt
@@ -573,7 +573,7 @@ open class TransactionBuilder(
 
         // Sanity check that the selected attachment actually passes.
 
-        if (!defaultOutputConstraint.isSatisfiedBy(constraintAttachment)) {
+        if (!isSatisfiedByWithNoWarnForSigConstraint(defaultOutputConstraint, constraintAttachment)) {
             // The defaultOutputConstraint is the input constraint by the attachment in use currently may have a rotated key
             if (defaultOutputConstraint is SignatureAttachmentConstraint && (getRotatedKeys(serviceHub).canBeTransitioned(defaultOutputConstraint.key, constraintAttachment.signerKeys))) {
                 return Pair(makeSignatureAttachmentConstraint(attachmentToUse.signerKeys), constraintAttachment)