{
  "manageEntity": {
    "action": "Save",
    "entityId": "1507613679",
    "entityType": "Track",
    "nonce": "0xe75e7169abbc8158a69afe8a781b344aac0edcad9b8c09869d3d7e0aa9f29e8f",
    "signature": "0xa43cad4a05aa28d5ce1fcbb1c3577b2bee5d15a50b9a9bdee1d0d51d745af1a6781c1076b18d655881d870713675abdbba39c15a3929e3c8f1468dce06bd6fc91c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}