{
  "manageEntity": {
    "action": "Save",
    "entityId": "1107921629",
    "entityType": "Track",
    "nonce": "0xf9149ec48543496b9be0f1a61f84699303e04ab091de684e6c0d9165c9ea485b",
    "signature": "0xea41f54b85f28d7f6c074ff8575f129034e69986c88ec03f9975d588cb15049172cf50eb8957cab1f5a0fb91680be5b912e2d39bd6420c975ebedb94f3133eba1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}