{
  "manageEntity": {
    "action": "Save",
    "entityId": "458255",
    "entityType": "Track",
    "nonce": "0x53a4ad340ec60c7f538b072beb8eb6308c1019baf9b7cc098d5d30bc45f364e2",
    "signature": "0x69196c60e848c28e4246afd5b526fb6f7aa33563ef4169b7735fef37df88c0267bdb9a3bf6aa300d6dfe485d0acc693aa7e3493a26c27926bfbf1d324b064b501b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}