{
  "manageEntity": {
    "action": "Save",
    "entityId": "2108663860",
    "entityType": "Track",
    "nonce": "0x7610d225d51f24476c9008fc2be9b7aaeeb6c7f70b6f1ce47a7a281ce3cff50d",
    "signature": "0x990257ed5c3f827abf42a438dce2df22969325eb58ea0087def5aaefbf50ad9a16500af9b2e55fae9a308d593c9d631b317a81a63ee031fd5f21bb6c6770c1c21b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}