{
  "manageEntity": {
    "action": "Save",
    "entityId": "472878357",
    "entityType": "Track",
    "nonce": "0x6521c08d2577ce90f977de9efb6db1ef5f953cf2bb299394e0f6847a0beb1c20",
    "signature": "0xaa4a9a195375d46c8424ab44233f050c192e410b84d92b3cc5a47d7d5edd8560449fbe18b452ffbb6a9067e3dc15525b01c7f79d34d9f09cb423205c5b0ee8d91b",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}