{
  "manageEntity": {
    "action": "Save",
    "entityId": "819850548",
    "entityType": "Track",
    "nonce": "0x4aaf1e4d4c0a15e4526889166726c8c74827388fb00560b89f7e7bd6f89021e4",
    "signature": "0xa211cee9f5eb90ff4c1a677f6f8ef1a99d05017bd3fdc75c2e3aa66d8fd69fb25b60d8902b0afa19c83a23f682a13613542d4cfab459d2b2252b96ca2b9f70241c",
    "signer": "0x0D2c1331F52a98aF1Bd206E3C28062E717CA9E51",
    "userId": "597927803"
  }
}