{
  "manageEntity": {
    "action": "Save",
    "entityId": "558535065",
    "entityType": "Track",
    "nonce": "0xcb96aa89ec4c06926ba9a7b15b62b560b2a2c33bab7b1dd14f59e5a9745694e0",
    "signature": "0x5ad0b046629ac1d726125294ee2fe5b954a065ab76f5fd9b3a629fa15d504d1e340563fb58b6eea7ba6bb9106780e46030594dff7cda91a52a692afe60db3a761b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}