NIP-26: adding section documenting valid fields and operators for conditions string (#194)

1 files changed, 20 insertions, 0 deletions

diff --git a/26.md b/26.md
index fc4d6f8..3eb1856 100644
--- a/26.md
+++ b/26.md
@@ -31,6 +31,26 @@ The **delegation token** should be a 64-byte Schnorr signature of the sha256 has
 nostr:delegation:<pubkey of publisher (delegatee)>:<conditions query string>
 ```
 
+##### Conditions Query String
+
+The following fields and operators are supported in the above query string:
+
+*Fields*:
+1. `kind`
+   -  *Operators*:
+      -  `=${KIND_NUMBER}` - delegator may only sign events of this kind
+2. `created_at`
+   -  *Operators*:
+      -  `<${TIMESTAMP}` - delegator may only sign events created ***before*** the specified timestamp
+      -  `>${TIMESTAMP}` - delegator may only sign events created ***after*** the specified timestamp
+
+In order to create a single condition, you must use a supported field and operator. Multiple conditions can be used in a single query string, including on the same field. Conditions must be combined with `&`.
+
+For example, the following condition strings are valid:
+
+- `kind=1&created_at<1675721813`
+- `kind=0&kind=1&created_at>1675721813`
+- `kind=1&created_at>1674777689&created_at<1675721813`
 
 #### Example