{
  "manageEntity": {
    "action": "Save",
    "entityId": "402396",
    "entityType": "Track",
    "nonce": "0x2621f9be164149b0c68f5a500ed14e3eb7240ff15b94777278f2dc11e99cb2fb",
    "signature": "0x7b45bcf88d1f9c00b9e09de1370597add1bf6eebce71e4d5f54978f2ef888c1165644a58dff973dbf52ed2a3e4cb9bd6894525aaf510e2d138c6e8ad713cf4001b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}