{
  "manageEntity": {
    "action": "Save",
    "entityId": "657029533",
    "entityType": "Track",
    "nonce": "0xbff31a8a69139b2d3c13d967bfaf7d6d9d04ea5fbc35f73873a6d6bf9efabbc1",
    "signature": "0x9cc55c532e422e15b3f76f4e71fc581b805ff04d98480d4c1f032a5672c29a5f228d0ec62c585fc120abde357bf6181f3b307864d29d8f579233f2f5cae5d8ed1c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}