{
  "manageEntity": {
    "action": "Save",
    "entityId": "135131572",
    "entityType": "Track",
    "nonce": "0x8d937c642ffe0c471a0fd462ef5702003fb97ce6cf3c347d7b44973ca215dc0d",
    "signature": "0xee11ad8b7c9cbd76916a52f4080efefb5f4f5df698b58f0f020ff8b1fc759e8a49fe8674b41a3f54aac74582418b364928ee75175813fb0493b9e958abd825a11c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}