Merge branch 'main' into fix-typo

ucan-wg · Jul 15, 2023 · ecf8a51 · ecf8a51
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diff --git a/README.md b/README.md
@@ -448,7 +448,7 @@ It is RECOMMENDED that the underlying key types RSA, ECDSA, and EdDSA be support
 
 ### 3.2.3 Time Bounds
 
-`nbf` and `exp` stand for "not before" and "expires at," respectively. These are standard fields from [RFC 7519][JWT] (JWT) (which in turn uses [RFC 3339]), and represent seconds in UTC without time zone or other offset. Taken together, they represent the time bounds for a token.
+`nbf` and `exp` stand for "not before" and "expires at," respectively. These are standard fields from [RFC 7519][JWT] (JWT) (which in turn uses [RFC 3339]), and represent seconds in UTC without time zone or other offset. Taken together, they represent the time bounds for a token. These timestamps MUST be represented as the number of integer seconds since the Unix epoch.
 
 The `nbf` field is OPTIONAL. When omitted, the token MUST be treated as valid beginning from the Unix epoch. Setting the `nbf` field to a time in the future MUST delay using a UCAN. For example, pre-provisioning access to conference materials ahead of time but not allowing access until the day it starts is achievable with judicious use of `nbf`.