Fix testnet4 block

Author: buffrr

protocol/src/constants.rs

@@ -69,14 +69,10 @@ impl ChainAnchor {
 
     // Testnet4 activation block
     pub const TESTNET4: fn() -> Self = || {
-        Self::new(
-            [
-                0x66, 0x02, 0x57, 0xdf, 0x48, 0xcb, 0xd5, 0x82, 0xf0, 0xa8, 0x5d, 0x9e, 0xad, 0x85,
-                0x3d, 0x68, 0x8f, 0x7a, 0x90, 0x0d, 0x56, 0x79, 0xe0, 0x63, 0x08, 0x00, 0x00, 0x00,
-                0x00, 0x00, 0x00, 0x00,
-            ],
-            50_000,
-        )
+        Self {
+            hash: BlockHash::all_zeros(),
+            height: 50_000,
+        }
     };
 
     // Testnet activation block