{
  "manageEntity": {
    "action": "Save",
    "entityId": "415834",
    "entityType": "Track",
    "nonce": "0xf18cb9887e1b19ab54172ba9b666eb42f387faa02d293a8960ab3bb52878d25a",
    "signature": "0xf8d7f273aeaea178d34d973bf69c9d8de1076ccefc3cd617db8457da90b74e4034aae4902d12a1f6f1f129f49af1b57e761ca48a254d6cd05136b7c2cda8b7b21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}