{
  "manageEntity": {
    "action": "Save",
    "entityId": "838553489",
    "entityType": "Track",
    "nonce": "0x556e9366835fa89056b99e2027d4acbb381e4bf9db7b42555007620040cca184",
    "signature": "0xadecae0b7879f0f2b21f619f9f11391866b6d68789598b1a8568ea696bac409b29077ff996b45bd4af97547021ffb8bcd371f9ab59eeab92b14e4f6deb8fb7a01b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}