clarify private key generation and usage for signing and publishing

Author: NoahMaizels

docs/documentation/soc-and-feeds.md

@@ -16,11 +16,39 @@ Feeds are a unique feature of Swarm which simulate the publishing of mutable con
 
 ## Requirements
 
-Interactions with SOC and feeds requires the following:
+Interactions with SOC and feeds require the following:
 
-* A fully initialized Bee light node running with fully synced postage batch data. (Running at `http://localhost:1633` by default)
+* A fully initialized Bee light node running with fully synced postage batch data (running at `http://localhost:1633` by default).
 * A valid postage batch ID.
-* An Ethereum-compatible private key to sign updates. Using your node or blockchain account wallet's private key is strongly discouraged. Using a dedicated key for SOC / feeds is recommended. 
+* A dedicated Ethereum-compatible publisher private key to sign updates. Do **not** use the private key of your Bee node or any wallet that holds funds.  
+
+:::tip
+You can use the `PrivateKey` class to generate a dedicated publisher key for signing SOC and feed updates:
+
+```js
+const crypto = require('crypto');
+const { PrivateKey } = require('@ethersphere/bee-js');
+
+// Generate 32 random bytes and construct a private key
+const hexKey = '0x' + crypto.randomBytes(32).toString('hex');
+const privateKey = new PrivateKey(hexKey);
+
+console.log('Private key:', privateKey.toHex());
+console.log('Public address:', privateKey.publicKey().address().toHex());
+````
+
+Example output:
+
+```bash
+Private key: 634fb5a872396d9693e5c9f9d7233cfa93f395c093371017ff44aa9ae6564cdd
+Public address: 8d3766440f0d7b949a5e32995d09619a7f86e632
+```
+
+Store this key securely.
+Anyone with access to it can publish to your feed or SOC.
+
+*It is recommended to use a separate publishing key for each feed or SOC. This limits the damage if a key is ever exposed — a compromised key should only allow publishing to one resource, not all of them.*
+:::
 
 ## Single Owner Chunks
 
@@ -107,7 +135,7 @@ Reference (Hex): 9d453ebb73b2fedaaf44ceddcf7a0aa37f3e3d6453fea5841c31f0ea6d61dc8
 
 
 In this example:
-- `privateKey` is used to initialize the writer as `socWriter` which is used to sign the SOC.
+- `privateKey` (initialized using our [previously generated](#requirements) publisher key) is used to initialize the writer as `socWriter` which is used to sign the SOC.
 - `NULL_IDENTIFIER` is the 32-byte value used as the identifier (can be replaced with any user-defined value).
 - `socWriter.upload()` signs and uploads the data, returning a `reference` as confirmation.
 
@@ -155,7 +183,7 @@ readSOC()
 ```
 
 In this example:
-- The `owner` is the Ethereum address used to sign the SOC.
+- The `owner` is the Ethereum address used to retrieve the SOC (derived from the private key [previously generated](#requirements)).
 - `NULL_IDENTIFIER` is the same default identifier used in the earlier upload example.
 - The returned payload is a `Bytes` object, and `.toUtf8()` converts it to a human-readable string.
 
@@ -171,7 +199,7 @@ Feeds are an abstraction built on top of Single Owner Chunks (SOCs) that **simul
 
 Similar to how an SOC is defined by an `owner` and `identifier`, a feed is defined by:
 
-* `owner`: an Ethereum-compatible address
+* `owner`: an Ethereum-compatible address 
 * `topic`: a unique 32-byte identifier 
 
 ### Concepts
@@ -199,7 +227,7 @@ Although it is possible to update feeds with an arbitrary data payload using `up
 
 The script below performs the following steps:
 
-1. Initializes the Bee client and derives the feed owner address from a private key.
+1. Initializes the Bee client and derives the feed owner address from a private key (which we have [previously generated](#requirements)).
 2. Uses the `uploadPayload()` method to upload a plain text string as a **payload update** to the feed with topic `"payload-update"`.
 3. Uploads the same string as a file to Swarm and obtains a reference.
 4. Uses the `upload()` method to upload the obtained reference as a **reference update** to the feed with topic `"reference-update"`.