{
  "manageEntity": {
    "action": "Save",
    "entityId": "1138203278",
    "entityType": "Track",
    "nonce": "0x1d54610c71e56c51a9328fa233b0b4bbe5842de98950fe12ee33e5f2db04acc8",
    "signature": "0x042954846e4ed712900339ff14735bd81bc5b493a29121231e3970605271cc9b49d4784f2e31381d11002933aeb4139ea62d89706435e30d0febb49fb5c5f2891c",
    "signer": "0xd708949D0521A856Ca6eB44B4112bAEE59741ADD",
    "userId": "490478463"
  }
}