{
  "manageEntity": {
    "action": "Save",
    "entityId": "72887553",
    "entityType": "Track",
    "nonce": "0x9c5198dccd850d8cc880d1fa6127547791e0f30ae903a1821537738ce5ac036c",
    "signature": "0x116d934c1cd309cb67b0af6591ed6db6dbfb2820fa89bf9d868ba6bf79dd207469acda4588dad207222dd44d607195ce1c30a66fe8a2f9b15cb33c97407b9ba81b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}