{
  "manageEntity": {
    "action": "Save",
    "entityId": "148701",
    "entityType": "Track",
    "nonce": "0xf5882b006819b8caa4a35f7f116753d1cb1b8b19c03f89b4a08dd6b44719e1f4",
    "signature": "0x71592c7c47b25293138e8e66da490934e46aec24f8cbcf5703c08ef459af9de7272772b417fa8538c01b8dfcecd78db6bdd2f2c292def0c5e02feb35e9741cec1c",
    "signer": "0xa185Ff45de6FF68eAa1d7ceC338cba250810134c",
    "userId": "54166466"
  }
}