{
  "manageEntity": {
    "action": "Save",
    "entityId": "621508",
    "entityType": "Track",
    "nonce": "0x880d48570405e0d514d657f59962e4aaf81e24a7ce2318178d67573cd29f97e6",
    "signature": "0x3522ebdcf52b9ab1ffd6237ffb86cad0f23e82f939fa8f4bee4fd366406fce6a0c20bf3ee5d5a8062b8fd94dbac6caeaf3025e1e495ebbb2e30134d66106ff541b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}