{
  "manageEntity": {
    "action": "Save",
    "entityId": "361537767",
    "entityType": "Track",
    "nonce": "0x37e532077bb752cd7de17a97b86ecabe061af7c64030c41e9e1a1466934d4091",
    "signature": "0xa29b87bf727059123b860a395c09c338201770de2127887aec1d86be3fc00fab52f3492d04fd43ae2f97759610ebb78bb9104e60527b95dd5eba885bce724f641b",
    "signer": "0xD9254B079e0e1571E56512C57188F2eec899054f",
    "userId": "854498636"
  }
}