{
  "manageEntity": {
    "action": "Save",
    "entityId": "545423",
    "entityType": "Track",
    "nonce": "0x62fea5b9d90732e15ae701d1a52482d46a5a430367a5f70b1267e07033858d36",
    "signature": "0xcd8f13764ac39ee077a184bf60c76f397df8cceddff617a6876a0fb82796e719677645f82187d8adfbd6ec1b83c5fb8777e4091a36910c7e9fca5c50c7a1d88c1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}