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README.md

@@ -11,7 +11,7 @@ It's reccomended to create a new wallet for your HIP2 server.
 https://hsd-dev.org/api-docs/#get-account-information
 
 ##### hsd
-`hsw-cli --id=<WALLET NAME> account get default | jq accountKey`
+`hsw-cli --id=<WALLET NAME> account get default | jq -r .accountKey`
 
 ##### Bob Wallet
 - Get your API key from Settings > Wallet then use hs-client:
@@ -48,7 +48,44 @@ since many users may make requests without sending payments.
 
 ### NGINX
 
+If you are using nginx as your webserver, you can configure one or even many
+domains to use the same HIP2 server, and even redirect to a hard-coded flat
+file (with single HNS address) in case the HIP2 server crashes!
 
+In this example, port `60000` is the nodeJS webserver actually running the
+`proofofconcept` website, which has a [hard-coded HIP2 address](https://github.com/pinheadmz/proofofconcept/blob/master/html/.well-known/wallets/HNS).
+
+By using the `proxy_pass` and `error_page` directives in the nginx configuration,
+the HIP2 address will by default come from HIP2-server but fall back to the flat
+file in case of failure.
+
+
+```
+server {
+  server_name *.proofofconcept proofofconcept;
+
+  listen 443 ssl;
+  listen [::]:443 ssl;
+
+  ssl_certificate /root/ssl/proofofconcept/cert.crt;
+  ssl_certificate_key /root/ssl/proofofconcept/cert.key;
+
+  location / {
+    proxy_pass         http://localhost:60000;
+    proxy_set_header   Host $host;
+  }
+
+  location @main {
+    proxy_pass         http://localhost:60000;
+    proxy_set_header   Host $host;
+  }
+
+  location /.well-known/wallets/HNS {
+    proxy_pass  http://localhost:20000;
+    error_page  500 502  @main;
+  }
+}
+```
 
 ### Build from source
 
@@ -59,4 +96,16 @@ git clone https://github.com/pinheadmz/hip2-server
 cd hip2-server
 npm install
 npm run build
-```
+```
+
+### Wallet recovery and pitfalls
+
+The default `lookahead` value in hsd is 200. That means that if at least one
+out of every 200 HIP2 address requests results in an on-chain transaction,
+the original wallet (or new wallet rescanning from the original seed) will
+recover all payments. Users should monitor the value saved to `log/hip2-index`
+and if it gets too large you may need to manually generate addresses in the
+recovery wallet before rescanning. After the hip2-server serves `0x7fffffff`
+addresses, it will start over at index `0` and recycle. The `log/hip2-index`
+file will continue to increment, so users should also take action if they see
+the value in that file exceed `2147483647`.