{
  "manageEntity": {
    "action": "Save",
    "entityId": "1887536978",
    "entityType": "Track",
    "nonce": "0xfd80a2b3b270e140ba5626c245c6607a99baae0e6325494712fb8214673495f7",
    "signature": "0x51310618f7958c064e72b47f96b5d58a40dbaa6f064bad973b9e10c77763c9a05b879f2c7e04361787cbcfdafa6d6590bc0e3af7b801360fd13d61d656fbacb61b",
    "signer": "0x45c4f1dcE13eeF476C74C5758696D56137253980",
    "userId": "824478223"
  }
}