{
  "manageEntity": {
    "action": "Save",
    "entityId": "719981892",
    "entityType": "Track",
    "nonce": "0xcee9af4f2faf008f05be0bd6f512b01c8f2aeef051595ea87a8748da3b0a86f8",
    "signature": "0x37f01c637ad9768b8ce4959b4124d29057865ee2ac5c4d63cdd7306589e25b6a34b759b800d63bda96b986d91a60945a4c15a0e9a7cba91607d3387d43fbd44c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}