refactor(types): fix lint errors and wrong implementation.

.golangci.yml

@@ -50,6 +50,7 @@ linters:
     - nilerr
     - nilnil
     - nlreturn
+    - nestif
     - noctx
     - nolintlint
     - nosprintfhostport
@@ -81,9 +82,8 @@ linters-settings:
 
   govet:
     enable-all: true
-    disable: fieldalignment
-    shadow:
-      strict: true
+    disable:
+      - fieldalignment
 
   predeclared:
     # Comma-separated list of predeclared identifiers to not report on.
@@ -130,6 +130,10 @@ issues:
         - forbidigo
         - lll
 
+    - path: _easyjson.go
+      linters:
+        - nestif
+
     - linters:
         - govet
       text: 'shadow: declaration of "err" shadows'

types/event/event.go

@@ -92,5 +92,6 @@ func (e *Event) IsValid() bool {
 
 	hash := sha256.Sum256(e.Serialize())
 
+	// TODO::: replace with libsecp256k1 (C++ version).
 	return sig.Verify(hash[:], pubkey)
 }