{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616829373",
    "entityType": "Track",
    "nonce": "0xf21b5705ac4568cc6074bd8844154565a18b474d2a682c7030d591e108f1da26",
    "signature": "0x300ab3d875a5102d7032caa514f41775a3cadaa543038a01be16c35e564f3ac776ad6f425c39b8196a0337424bddc1588cb49a8e3c2d3043ba3416d030d7a8ec1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}