Problem: IsStorageEmpty is not implemented (cosmos#490)

* Problem: IsStorageEmpty is not implemented

Closes: cosmos#486

* update deps

Author: yihuang

go.mod

@@ -273,7 +273,7 @@ replace (
 	github.com/99designs/keyring => github.com/cosmos/keyring v1.2.0
 	// use Cosmos geth fork
 	// branch: release/1.16
-	github.com/ethereum/go-ethereum => github.com/cosmos/go-ethereum v0.0.0-20250806193535-2fc7571efa91
+	github.com/ethereum/go-ethereum => github.com/cosmos/go-ethereum v1.16.2-cosmos-1
 	// Security Advisory https://github.com/advisories/GHSA-h395-qcrw-5vmq
 	github.com/gin-gonic/gin => github.com/gin-gonic/gin v1.9.1
 	// replace broken goleveldb

go.sum

@@ -854,8 +854,8 @@ github.com/cosmos/cosmos-sdk v0.53.4 h1:kPF6vY68+/xi1/VebSZGpoxQqA52qkhUzqkrgeBn
 github.com/cosmos/cosmos-sdk v0.53.4/go.mod h1:7U3+WHZtI44dEOnU46+lDzBb2tFh1QlMvi8Z5JugopI=
 github.com/cosmos/go-bip39 v1.0.0 h1:pcomnQdrdH22njcAatO0yWojsUnCO3y2tNoV1cb6hHY=
 github.com/cosmos/go-bip39 v1.0.0/go.mod h1:RNJv0H/pOIVgxw6KS7QeX2a0Uo0aKUlfhZ4xuwvCdJw=
-github.com/cosmos/go-ethereum v0.0.0-20250806193535-2fc7571efa91 h1:kgu2NkKzSeJJlVsKeS+KbdzfUeaFqrqmmhwixd/PNH4=
-github.com/cosmos/go-ethereum v0.0.0-20250806193535-2fc7571efa91/go.mod h1:X5CIOyo8SuK1Q5GnaEizQVLHT/DfsiGWuNeVdQcEMNA=
+github.com/cosmos/go-ethereum v1.16.2-cosmos-1 h1:QIaIS6HIdPSBdTvpFhxswhMLUJgcr4irbd2o9ZKldAI=
+github.com/cosmos/go-ethereum v1.16.2-cosmos-1/go.mod h1:X5CIOyo8SuK1Q5GnaEizQVLHT/DfsiGWuNeVdQcEMNA=
 github.com/cosmos/gogogateway v1.2.0 h1:Ae/OivNhp8DqBi/sh2A8a1D0y638GpL3tkmLQAiKxTE=
 github.com/cosmos/gogogateway v1.2.0/go.mod h1:iQpLkGWxYcnCdz5iAdLcRBSw3h7NXeOkZ4GUkT+tbFI=
 github.com/cosmos/gogoproto v1.4.2/go.mod h1:cLxOsn1ljAHSV527CHOtaIP91kK6cCrZETRBrkzItWU=

x/vm/statedb/statedb.go

@@ -104,6 +104,15 @@ func (s *StateDB) GetStorageRoot(addr common.Address) common.Hash {
 	return sr.Hash()
 }
 
+func (s *StateDB) IsStorageEmpty(addr common.Address) bool {
+	empty := true
+	s.keeper.ForEachStorage(s.ctx, addr, func(key, value common.Hash) bool {
+		empty = false
+		return false
+	})
+	return empty
+}
+
 /*
 	PointCache, Witness, and AccessEvents are all utilized for verkle trees.
 	For now, we just return nil and verkle trees are not supported.