adjust rpc call to eth block timing

Loginpage style

backend/internal/protocols/ethereum/jsonrpc.go

@@ -19,11 +19,13 @@ const (
 	rpcTimeoutMS      = 30000
 	rpcMaxRetries     = 3
 	rpcRetryBaseMS    = 2000
+	rpcMinIntervalMS  = 1000
 )
 
 type JsonRpcEthereum struct {
 	rpcURL     string
 	client     *http.Client
+	lastCallAt time.Time
 }
 
 func NewJsonRpcEthereum(rpcURL string) (*JsonRpcEthereum, error) {
@@ -58,6 +60,8 @@ type rpcError struct {
 }
 
 func (j *JsonRpcEthereum) callRPC(ctx context.Context, method string, params ...interface{}) (json.RawMessage, error) {
+	j.throttle(ctx)
+
 	if params == nil {
 		params = []interface{}{}
 	}
@@ -72,7 +76,25 @@ func (j *JsonRpcEthereum) callRPC(ctx context.Context, method string, params ...
 		return nil, fmt.Errorf("marshal RPC request: %w", err)
 	}
 
-	return j.callWithRetry(ctx, method, body)
+	result, callErr := j.callWithRetry(ctx, method, body)
+	j.lastCallAt = time.Now()
+
+	return result, callErr
+}
+
+func (j *JsonRpcEthereum) throttle(ctx context.Context) {
+	if j.lastCallAt.IsZero() {
+		return
+	}
+	minInterval := time.Duration(rpcMinIntervalMS) * time.Millisecond
+	elapsed := time.Since(j.lastCallAt)
+	if elapsed >= minInterval {
+		return
+	}
+	select {
+	case <-ctx.Done():
+	case <-time.After(minInterval - elapsed):
+	}
 }
 
 // callWithRetry executes a JSON-RPC POST with exponential backoff on transient errors.

frontend/src/pages/login/Login.css

@@ -1,19 +1,38 @@
 .login-page {
-  min-height: 100vh;
-  background-image: url(/ping.png);
-  background-size: 67%;
-  background-position: center;
-  background-repeat: no-repeat;
+  position: relative;
+  width: 100vw;
+  height: 100vh;
+  overflow: hidden;
+  background-color: #000000;
+}
+
+.login-bg-video {
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  min-width: 100%;
+  min-height: 100%;
+  width: auto;
+  height: auto;
+  transform: translate(-50%, -50%);
+  object-fit: cover;
+  z-index: 0;
+  filter: grayscale(85%);
+  -webkit-filter: grayscale(85%);
+  opacity: 0.05;
 }
 
 .login-card {
+  position: relative;
+  z-index: 1;
   max-width: 400px;
-  margin: 20px auto;
+  margin: 0 auto;
   padding: 2rem;
   padding-top: 8rem;
   border: 1px solid var(--color-border-light);
   border-radius: var(--radius-xl);
   background-color: rgba(0, 0, 0, 0.75);
+  top: 20px;
 }
 
 .login-heading {
@@ -32,7 +51,6 @@
   padding: 0.75rem;
   font-size: 1.2rem;
   margin-top: 16px;
-  ;
 }
 
 .login-footer {
@@ -55,10 +73,14 @@
   }
 }
 
-.login-form-hidden {
+.login-card-fadein {
   opacity: 0;
+  animation: fadeIn 2s ease-in-out forwards;
+  animation-delay: 3s;
 }
 
-.login-form-visible {
+.login-interactive-fadein {
+  opacity: 0;
   animation: fadeIn 2s ease-in-out forwards;
+  animation-delay: 6s;
 }

frontend/src/pages/login/Login.jsx

@@ -5,7 +5,6 @@ import Input from "../../components/Input";
 import "./Login.css";
 
 export default function Login() {
-  const [isVisible, setIsVisible] = useState(false);
   const [email, setEmail] = useState("");
   const [password, setPassword] = useState("");
   const [error, setError] = useState("");
@@ -36,12 +35,22 @@ export default function Login() {
 
   return (
     <div className="login-page">
-      <div className="login-card" onMouseEnter={() => setIsVisible(true)}>
+      <video
+        autoPlay
+        loop
+        muted
+        playsInline
+        className="login-bg-video"
+      >
+        <source src="/koin_spin.mp4" type="video/mp4" />
+      </video>
+
+      <div className="login-card login-card-fadein">
         <h1 className="login-heading">
           <span className="login-brand">Koin Ping</span> - Login
         </h1>
 
-        <div className={isVisible ? "login-form-visible" : "login-form-hidden"}>
+        <div className="login-interactive-fadein">
           {error && <div className="alert alert--error">{error}</div>}
 
           <form onSubmit={handleSubmit}>