{
  "manageEntity": {
    "action": "Save",
    "entityId": "1288040344",
    "entityType": "Track",
    "nonce": "0xcfdb479ceb76da6a69be7d6c0b082cd82436934bd7dcd72b5f16cfd96e4e495c",
    "signature": "0xf9edd913b102a9535296f1159b3f485865ac336db36838b2908395e3b39fed235783c67360eff463f646aabc0605a3d211b7cedc9904f6fee002be2e18ef22401b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}