This could work?

```json

{

"kind": 900,

"created_at": "[Creation Timestamp]",

"content": "[Content in Markdown]",

"tags": [

["title", ""],

["summary", ""], // Optional: Short Description for preview

["valid_from", "Timestamp"], // Optional: Start date of the contract

["valid_to", "Timestamp"], // Optional: End date of the contract

["L", "nostr_contracts"],

["l", "Contract", "nostr_contracts"], // One could use "Covenant", "Agreement", or another type according to your specifications.

["p", "party", ""],

["p", "party", ""],

["p", "party", ""],

["expiration", ""],

["jurisdiction", {

"country": "USA",

"state": "California",

"city": "San Francisco",

"court": "Superior Court of California"

}]

],

"pubkey": "[Signer's Public Key]",

"id": "[Event ID]",

}

```