{
  "manageEntity": {
    "action": "Save",
    "entityId": "56654798",
    "entityType": "Track",
    "nonce": "0x8518e07dab9ac234f7c9fe7fe304b55db1244c116d1ee4a5aa1a02704427b91e",
    "signature": "0xce5902990d41a6fb5abcaebd90c4b3b74660fd06b0742a190d44492fa53b07406fc3e4e3cc0cfe74464b2fb14ad0c4c27aa490fbb4094c2b0d37b2753e45d2541b",
    "signer": "0x568426a5D555ADe94657d547B2Df4a4dc1f0C014",
    "userId": "71569007"
  }
}