{
  "manageEntity": {
    "action": "Save",
    "entityId": "372199821",
    "entityType": "Track",
    "nonce": "0xc13ef858638ec8f8dc812fabbc140e52c3dc6689d020232b40d0e056796e7e83",
    "signature": "0x6077b35cdac7f109341bdd6cea6179a2b289e22dc4edbf1de7b46b15af4b3c1077c52cad78b47732b229e1df6a555ba55929d710a63114677501ef143a2d34f11b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}