{
  "manageEntity": {
    "action": "Save",
    "entityId": "250178",
    "entityType": "Track",
    "nonce": "0x0074252bdb1a61e1d7e48b01061a7cadb3462c40c9a3f4c697bc91f4fac0caf5",
    "signature": "0xc63af7755b41ee8f0ba50956e966c361cd689424001467b18f6890d84ebb775a1f25fdf0bf51870ce7a738c4ec97ec03a0b37ea80c9f494304ad3b9a4b5af4fd1c",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}