{
  "manageEntity": {
    "action": "Save",
    "entityId": "516225910",
    "entityType": "Track",
    "nonce": "0x7ba08766b58387dd7cac716e684bf71ab73c10ed03208471cb367a8bad2b5ff1",
    "signature": "0x40a7e42513317d56669e51d1950a638b3bbca497f43b153e4478c7b931e194495a2f4c54f4b1b62211faad5021d5a5c06932049894293fbffc2f2f4d0ec4c4f41c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}