{
  "manageEntity": {
    "action": "Save",
    "entityId": "648616916",
    "entityType": "Track",
    "nonce": "0xd492fe634be37322f5baaab0ad678b8640997076a11717bb6bfb0d2a4fbfa031",
    "signature": "0x1270230e9a91a0adc173b3604c52a72eccbae51ffa10a0f3fb27ba3338e695bd65239f9a0c0660f596f1425cc293b1a793b39bc7989b5d55088a8a65446474b31b",
    "signer": "0x48FD75f1b7D81A96b8b8624aB7040523C402c202",
    "userId": "325172820"
  }
}