{
  "manageEntity": {
    "action": "Save",
    "entityId": "445856",
    "entityType": "Track",
    "nonce": "0x72d4246795fd9d6dcdf26c52297e4a9e6d172c0409faf080cdea32ae65b95ed8",
    "signature": "0x72dbc547cbc707d61bb773d3f4258d9a9a00d4a70212b93d77a74b03e08fa9a0532d1b1be0413fbafff3da4a44ad163ea1b7098965362f7b7bff1f9ff7be11ab1b",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}