Merge branch 'master' of github.com:adityapk00/zecpaperwallet

README.md

@@ -1,6 +1,7 @@
 # zecpaperwallet
 zecpaperwallet is a Zcash Sapling paper wallet generator that can run completely offline. You can run it on an air-gapped computer to generate your shielded z-addresses, which will allow you to keep your keys completely offline. 
 
+*Example:*
 ![Paper Wallet](docs/paperwallet.png?raw=true)
 
 # Download
@@ -31,7 +32,15 @@ cargo build --release
 
 The binary is available in the `target/release` folder.
 
-## Run without network
+## Ensuring Security
+When generating paper wallets that will store large amounts of crypto, please take special care to ensure the keys are generated and kept completely offline.
+1. `zecpaperwallet` supports ARMv8 (Raspberry Pi 3+). You can put one in a Faraday cage along with a printer, and print out the PDFs securely.
+2. Please ensure you supply random entropy when you run `zecpaperwallet`. Your entropy is mixed in with system-provided entropy to generate keys
+3. If you can, run with `unshare`, which will disable all network interfaces to a process, providing you with an additional layer of safety. (See next section)
+4. After you've generated the keys, you can tear off the Address potion of the wallet and take it to your online computer/phone to send the address funds. Please always keep the private key offline. 
+5. When you're ready to spend the cold storage keys, import the private key into a full node, then don't re-use the key again. 
+
+### Run without network
 If you are running a newish version of Linux, you can be doubly sure that the process is not contacting the network by running zecpaperwallet without the network namespace.
 
 ```
@@ -46,16 +55,17 @@ USAGE:
     zecpaperwallet [FLAGS] [OPTIONS] [output]
 
 FLAGS:
-    -e, --entropy    Provide additional entropy to the random number generator. Any random string, containing 32-64
-                     characters
     -h, --help       Prints help information
     -n, --nohd       Don't reuse HD keys. Normally, zecpaperwallet will use the same HD key to derive multiple
                      addresses. This flag will use a new seed for each address
-    -t, --testnet    Generate Testnet addresses
+        --testnet    Generate Testnet addresses
     -V, --version    Prints version information
 
 OPTIONS:
+    -e, --entropy <entropy>       Provide additional entropy to the random number generator. Any random string,
+                                  containing 32-64 characters
     -f, --format <FORMAT>         What format to generate the output in [default: json]  [possible values: pdf, json]
+    -t, --taddrs <t_addresses>    Numbe rof T addresses to generate [default: 0]
     -z, --zaddrs <z_addresses>    Number of Z addresses (Sapling) to generate [default: 1]
 
 ARGS: