{
  "manageEntity": {
    "action": "Save",
    "entityId": "599609",
    "entityType": "Track",
    "nonce": "0x5211a85b1f9852bff4eff246efb666faf52df8b83a6c80ba97aa8242de840df0",
    "signature": "0xb4b7aec5743645444f458822c41bbb3965c8d6107d36f1818b37cd49365cd76e38348578821fe496a43046cfb19f146f576cc0924b0f8569982a0894851ef5021c",
    "signer": "0x9369ae91F6A1cC4996D9126FD991d64e7E24c805",
    "userId": "333763354"
  }
}