{
  "manageEntity": {
    "action": "Save",
    "entityId": "564486",
    "entityType": "Track",
    "nonce": "0xc1546984059ede22b5b18c7e3d3fe95c8baf60406d198b9b774983798039519c",
    "signature": "0x12c5bfb9b8664f6610fab90b8e6ff550ced30cca20180729dae1c0d6e64a917c289720f5bc9674798abe433868b6ebcb046f5f26256bece71a669e21325f19ac1b",
    "signer": "0xA9012b628a5Bed1406f97647fc6Be02eC3BF75b1",
    "userId": "141875639"
  }
}