{
  "manageEntity": {
    "action": "Save",
    "entityId": "600175337",
    "entityType": "Track",
    "nonce": "0x180f89a5504003edf380b02af581603c2b21286c09908b84c02a7de4c689f4ad",
    "signature": "0xa8608db1d9e371e6e55018bbf731171a0b4b6f13c2c8ce1d594939b8c8c37bf5581c797c782b0b9925d0a8e6e403b22fe7998e564c14ee072888013c505b7fc41b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}