{
  "manageEntity": {
    "action": "Save",
    "entityId": "648829081",
    "entityType": "Track",
    "nonce": "0x284f5ecaf4f7b95179ff04cf5b7cdb6e8b6fb735a78233a15e671e285befaf33",
    "signature": "0x8d51eb352ef3a646fbac8b88c0603da9e234b8b345f6527b1a2886488a51d6f74b5adf08aa34cc1c2aa69ee50a253e06cc1357ba92a010408534f83801ee52b01b",
    "signer": "0x020819dBA653525cf3F8069104a51B241BfC46E1",
    "userId": "1967"
  }
}