{
  "manageEntity": {
    "action": "Save",
    "entityId": "1969038325",
    "entityType": "Track",
    "nonce": "0xd3973a61a09ca46dd0d901b7f08634bb7a8a5b153c3e3f19ac3ca57cd1a6a8dc",
    "signature": "0xf6453f24e044bb54cbefaac667c73d5ee83f2457a03e2e6445c3ea2af9481c0055923433b01a0a3d815c79144a826b76ca233a483bd26973f0a192f91bcc77f41c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}