{
  "manageEntity": {
    "action": "Save",
    "entityId": "544487",
    "entityType": "Track",
    "nonce": "0xe5de8bac472952a78b29a5d863e71c5fef8bb45a3e7f6f8e322be961278ea39d",
    "signature": "0x3d5ce0f9607f71d04a98c296e6a84846b1808518aa912f16885b0d8b67946359678979bc86c04c67dafb9dacdb73f25e36745144255bca9831b37097a2f17de51b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}