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+### Key problems and existing approaches 
+
+See links in [overview.md](overview.md) for some mighty attempts at comprehensive lists of dweb protocols and projects.
+
+The purpose of this document is to try to analyze how some of the existing dweb projects attack certain key problems:
+
+ * discovery of users and content
+ * interoperable messaging
+ * message queueing and persistence
+ * reputation
+ * identity and pseudonymity
+ * metadata and ownership
+ * economy of services
+ * scalability
+ * testing and metrics
+ 
+ Fundamental user stories being addressed here:  I want to...send a message to a person I know, and I don't know what system they use for messaging; find a topic or person by keyword search; find reliable and credible information or resources on a topic; know the ownership/conditions around resources I find; have a way to pay for all the services without privacy intrusions; have a fast and stable experience at global scale; and have some way to evaluate all of the above on different systems.
+ 
+ ### Discovery
+ 
+ * gossip mesh systems
+ 
+ * indexing and follow-bots
+ 
+_how does one discover users and topics within each ecosystem_
+IRIS - WoT mapping of human readable names to identity attributes - https://github.com/irislib/iris
+ 
+ ### Messaging between systems
+ 
+*What does a message from a user to another user look like on the wire?* 
+ _(how similar are the schemas?  can there be a universal schema with namespacing?)_
+ 
+* Matrix - https://matrix.org/docs/spec/
+ (proposal for related events - https://github.com/matrix-org/matrix-doc/blob/matthew/msc1849/proposals/1849-aggregations.md)
+Matrix messages are sent to rooms, which users are subscribed to.  to message a user you first invite them to a room
+```
+PUT /_matrix/client/r0/rooms/%21636q39766251%3Aexample.com/send/m.room.message/35 HTTP/1.1
+Content-Type: application/json
+
+{
+  "msgtype": "m.text",
+  "body": "hello"
+}
+```
+ 
+* ActivityPub - https://www.w3.org/TR/activitypub/
+POST to the user's server's outbox endpoint
+```{"@context": "https://www.w3.org/ns/activitystreams",
+ "type": "Note",
+ "to": ["https://chatty.example/ben/"],
+ "attributedTo": "https://social.example/alyssa/",
+ "content": "Say, did you finish reading that book I lent you?"}
+```
+ 
+ ### Message queueing and persistence
+ 
+ * Matrix - peered storage, replicated JSON between nodes
+ 
+ * GUN - graph db
+ 
+ * Mastodon - federated servers
+ 
+ ### General decentralized storage
+ 
+ * IPFS - immutable, content-hash addressed
+
+ * DAT 
+
+ * mutable systems using CRDTs
+ 
+Example: GUN stores hacker noon annotations on user local storage - https://www.coindesk.com/hacker-noon-is-storing-content-on-a-blockchain-after-ditching-medium
+ 
+ 
+ ### Reputation/credibility
+ 
+ * IRIS
+ 
+ ### Identity
+ 
+ ### Metadata and ownership
+ 
+ * Ceramic
+ 
+ ### Economy of services
+ 
+ ### Scalability
+ 
+ * AXE (reduce unneeded connections) 
+ https://gun.eco/docs/AXE
+
+ ### Testing and Metrics
+ 
+ * PANIC - https://github.com/gundb/panic-server
+ 
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