{
  "manageEntity": {
    "action": "Save",
    "entityId": "91740",
    "entityType": "Track",
    "nonce": "0x7f1f9c514cddecc7f2f293a6e51c541aecd297cce57b4e5328502d98560db13f",
    "signature": "0xfdf7d23baf2fc18b22f3cdf4cca0475feb390c64d8ca727e13792f73a47b70117ec24ca785aefffc60c4ec4473d502f852ca819206832256a8ce06accb9eab5f1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}