{
  "manageEntity": {
    "action": "Save",
    "entityId": "1491597591",
    "entityType": "Track",
    "nonce": "0x4b3797966f4f8921bbce4301cfab556fdebde4c23d87e6b1d0d4fb0cd775230d",
    "signature": "0x2925b4bb16760af43d922e9cf7b1c541fc4568e1e09acda50cbfb1939ab20cc00f0e3bd429a78c7b4aa11a04bdc9328bfddff08e48550589d669b5c508dc23a71c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}