{
  "manageEntity": {
    "action": "Save",
    "entityId": "1354840847",
    "entityType": "Track",
    "nonce": "1787157297475346859",
    "signature": "0xe21f7996aaffc03f7804500122d35a20fb5f7edf8bb2df3248e45a967f362d860f8071d8b9275b743c2a2c930a7f9adf466a5e3e2160891a56b78f2f03558a771b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}