{
  "manageEntity": {
    "action": "Save",
    "entityId": "775356847",
    "entityType": "Track",
    "nonce": "0x3cacfb9db1dce6bf0bac18e7a4439e7b90d087f50a0040c666af55f87a72e558",
    "signature": "0x1f89f37a85038ad7d579c932c304086f1ed7d9257b87320c7b6bb1261c534c5652e23ad5fd9d41649679b8e8f608a827cfa0bc29e848d0cadda0b4b4a123eb4b1b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}