diff --git a/docs/signer/nip-07.md b/docs/signer/nip-07.md
index 40f4741..b0b5f22 100644
--- a/docs/signer/nip-07.md
+++ b/docs/signer/nip-07.md
@@ -64,28 +64,3 @@ async function example() {
   }
 }
 ```
-
-## Request Serialization
-The signer implements a lock mechanism to prevent concurrent calls to the extension:
-
-```typescript
-class Nip07Signer implements ISigner {
-  #lock = Promise.resolve()
-
-  #then = async <T>(f: (ext: Nip07) => T | Promise<T>) => {
-    const promise = this.#lock.then(() => {
-      const ext = getNip07()
-      if (!ext) throw new Error("Nip07 is not enabled")
-      return f(ext)
-    })
-
-    // Reset lock after completion or error
-    this.#lock = promise.then(
-      () => undefined,
-      () => undefined
-    )
-
-    return promise
-  }
-}
-```
diff --git a/docs/util/blossom.md b/docs/util/blossom.md
index a16064c..33545b9 100644
--- a/docs/util/blossom.md
+++ b/docs/util/blossom.md
@@ -47,19 +47,22 @@ export declare const makeBlossomAuthEvent: (opts: BlossomAuthEventOpts) => Event
 export declare const buildBlobUrl: (server: string, sha256: string, extension?: string) => string
 
 // Checks if a blob exists on server
-export declare const checkBlobExists: (server: string, sha256: string, options?: { authEvent?: SignedEvent }) => Promise<{exists: boolean; size?: number}>
+export declare const checkBlobExists: (server: string, sha256: string, options?: { headers?: Record<string, string>; authEvent?: SignedEvent }) => Promise<{exists: boolean; size?: number}>
 
 // Downloads blob from server
-export declare const getBlob: (server: string, sha256: string, options?: { authEvent?: SignedEvent; range?: {start: number; end?: number} }) => Promise<Response>
+export declare const getBlob: (server: string, sha256: string, options?: { headers?: Record<string, string>; authEvent?: SignedEvent; range?: {start: number; end?: number} }) => Promise<Response>
+
+// Checks if uploads are allowed (HEAD request to /upload)
+export declare const canUploadBlob: (server: string, options?: { headers?: Record<string, string>; authEvent?: SignedEvent }) => Promise<Response>
 
 // Uploads blob to server
-export declare const uploadBlob: (server: string, blob: Blob | ArrayBuffer, options?: { authEvent?: SignedEvent }) => Promise<Response>
+export declare const uploadBlob: (server: string, blob: Blob | ArrayBuffer, options?: { headers?: Record<string, string>; authEvent?: SignedEvent }) => Promise<Response>
 
 // Deletes blob from server
-export declare const deleteBlob: (server: string, sha256: string, options?: { authEvent?: SignedEvent }) => Promise<Response>
+export declare const deleteBlob: (server: string, sha256: string, options?: { headers?: Record<string, string>; authEvent?: SignedEvent }) => Promise<Response>
 
 // Lists blobs for a pubkey
-export declare const listBlobs: (server: string, pubkey: string, options?: { authEvent?: SignedEvent; since?: number; until?: number }) => Promise<Response>
+export declare const listBlobs: (server: string, pubkey: string, options?: { headers?: Record<string, string>; authEvent?: SignedEvent; since?: number; until?: number }) => Promise<Response>
 ```
 
 ## File Encryption
diff --git a/docs/util/wallet.md b/docs/util/wallet.md
new file mode 100644
index 0000000..eb83cf7
--- /dev/null
+++ b/docs/util/wallet.md
@@ -0,0 +1,76 @@
+# Wallet
+
+Types and utilities for working with Lightning wallet integrations in Nostr applications.
+
+## Types
+
+```typescript
+export enum WalletType {
+  WebLN = "webln",
+  NWC = "nwc",
+}
+
+export type WebLNInfo = {
+  enabled: boolean
+}
+
+export type NWCInfo = {
+  pubkey: string
+  relay: string
+  secret: string
+}
+
+export type WebLNWallet = {
+  type: WalletType.WebLN
+  info: WebLNInfo
+}
+
+export type NWCWallet = {
+  type: WalletType.NWC
+  info: NWCInfo
+}
+
+export type Wallet = WebLNWallet | NWCWallet
+```
+
+## Type Guards
+
+```typescript
+// Check if a wallet is a WebLN wallet
+export declare const isWebLNWallet: (wallet: Wallet) => wallet is WebLNWallet
+
+// Check if a wallet is a Nostr Wallet Connect wallet
+export declare const isNWCWallet: (wallet: Wallet) => wallet is NWCWallet
+```
+
+## Usage
+
+```typescript
+import { Wallet, WalletType, isWebLNWallet, isNWCWallet } from '@welshman/util'
+
+function handleWallet(wallet: Wallet) {
+  if (isWebLNWallet(wallet)) {
+    // TypeScript knows wallet.info is WebLNInfo
+    console.log('WebLN enabled:', wallet.info.enabled)
+  } else if (isNWCWallet(wallet)) {
+    // TypeScript knows wallet.info is NWCInfo
+    console.log('NWC relay:', wallet.info.relay)
+  }
+}
+
+// Create a WebLN wallet
+const weblnWallet: Wallet = {
+  type: WalletType.WebLN,
+  info: { enabled: true }
+}
+
+// Create an NWC wallet
+const nwcWallet: Wallet = {
+  type: WalletType.NWC,
+  info: {
+    pubkey: "...",
+    relay: "wss://relay.example.com",
+    secret: "..."
+  }
+}
+```
\ No newline at end of file