{
  "manageEntity": {
    "action": "Save",
    "entityId": "494045",
    "entityType": "Track",
    "nonce": "0x20f591662e2ef554e51b784a7e5bad5361a5da2009928f67d282550e1b55596e",
    "signature": "0xc72939212fd031d1d969d9558facb87ccc93976cb035c005882bfd752bfe79327db1129852489305869f6f9514f033a04321f18941936b7ddd6a3871aabeebd31c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}