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-rw-r--r--bip-0070.mediawiki1
1 files changed, 1 insertions, 0 deletions
diff --git a/bip-0070.mediawiki b/bip-0070.mediawiki
index 1902488..5d5674c 100644
--- a/bip-0070.mediawiki
+++ b/bip-0070.mediawiki
@@ -159,6 +159,7 @@ after the time of the payment request. After that time has expired, parties must
If the customer authorizes payment, then the Bitcoin client:
# Creates and signs one or more transactions that satisfy (pay in full) PaymentDetails.outputs
+# Validate that customer's system unix time (UTC) is still before PaymentDetails.expires. If it is not, the payment should be cancelled.
# Broadcast the transactions on the Bitcoin p2p network.
# If PaymentDetails.payment_url is specified, POST a Payment message to that URL. The Payment message is serialized and sent as the body of the POST request.