diff --git a/README.md b/README.md
index 6cc1d1a..0668f9f 100644
--- a/README.md
+++ b/README.md
@@ -994,7 +994,7 @@ difficulty is advertised via `GET /api/v1/server` in the `hashcash_bits` field.
 
 **Request Body:**
 ```json
-{"nick": "alice", "hashcash": "1:20:260310:neoirc::3a2f1"}
+{"nick": "alice", "pow_token": "1:20:260310:neoirc::3a2f1"}
 ```
 
 | Field      | Type   | Required    | Constraints |
@@ -1030,7 +1030,7 @@ difficulty is advertised via `GET /api/v1/server` in the `hashcash_bits` field.
 ```bash
 TOKEN=$(curl -s -X POST http://localhost:8080/api/v1/session \
   -H 'Content-Type: application/json' \
-  -d '{"nick":"alice","hashcash":"1:20:260310:neoirc::3a2f1"}' | jq -r .token)
+  -d '{"nick":"alice","pow_token":"1:20:260310:neoirc::3a2f1"}' | jq -r .token)
 echo $TOKEN
 ```
 
diff --git a/internal/cli/api/types.go b/internal/cli/api/types.go
index 7a8714b..b9ae32e 100644
--- a/internal/cli/api/types.go
+++ b/internal/cli/api/types.go
@@ -5,7 +5,7 @@ import "time"
 // SessionRequest is the body for POST /api/v1/session.
 type SessionRequest struct {
 	Nick     string `json:"nick"`
-	Hashcash string `json:"hashcash,omitempty"`
+	Hashcash string `json:"pow_token,omitempty"` //nolint:tagliatelle
 }
 
 // SessionResponse is the response from session creation.
diff --git a/internal/handlers/api.go b/internal/handlers/api.go
index bdfecb8..9e87aa7 100644
--- a/internal/handlers/api.go
+++ b/internal/handlers/api.go
@@ -147,7 +147,7 @@ func (hdlr *Handlers) handleCreateSession(
 ) {
 	type createRequest struct {
 		Nick     string `json:"nick"`
-		Hashcash string `json:"hashcash,omitempty"`
+		Hashcash string `json:"pow_token,omitempty"` //nolint:tagliatelle
 	}
 
 	var payload createRequest
diff --git a/web/src/app.jsx b/web/src/app.jsx
index c2eb2db..2bea255 100644
--- a/web/src/app.jsx
+++ b/web/src/app.jsx
@@ -146,7 +146,7 @@ function LoginScreen({ onLogin }) {
       }
       const reqBody = { nick: nick.trim() };
       if (hashcashStamp) {
-        reqBody.hashcash = hashcashStamp;
+        reqBody.pow_token = hashcashStamp;
       }
       const res = await api("/session", {
         method: "POST",