{
  "manageEntity": {
    "action": "Save",
    "entityId": "1889971117",
    "entityType": "Track",
    "nonce": "0x03ec0f7978303a09e49015b464e8803b59bee3fc7612bfc946f709782e2f0efc",
    "signature": "0xf9fafc854fd3d44338abdfa5a624242a1575b4fe54a240ca90f4475423884e724243256e5b660ba62557b2ee3515e5784b09f4cca0e4ad46a9a3ab5790b9acc71b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}