Added ownership reference + wallet creation methods

api/pkg/db/chainassets/assets.go

@@ -0,0 +1,11 @@
+package chainassets
+
+import (
+	"context"
+
+	"github.com/tech/sendico/pkg/model"
+)
+
+type DB interface {
+	Resolve(ctx context.Context, chainAsset model.ChainAssetKey) (*model.ChainAssetDescription, error)
+}