{
  "manageEntity": {
    "action": "Save",
    "entityId": "507055858",
    "entityType": "Track",
    "nonce": "0x00c5cb8d01b87bef087b95aa36069e7042a825e5ff30cf4f650479e7581504b4",
    "signature": "0xb73a371115d4150f8265e959e001d748ba778ce615c7f8fccd450fd93cf5b045586c742f51db73b65e2b96028b49995fe579f6941bb9d29a5dcf81642554c4f71c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}