{
  "manageEntity": {
    "action": "Save",
    "entityId": "609630",
    "entityType": "Track",
    "nonce": "0x56594684c11da3e6a566aa0fa58fbf7f45e84236f214c9530bd750c91db714fe",
    "signature": "0x443c0b1cb55942352f23ec796a033dfeb9cf608132a3fa79b3a1654394e4023d5b7c2c24f750eb9e1423059adeb638326c5288bd05ec4d42c9e472bed110eb861b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}