{
  "manageEntity": {
    "action": "Save",
    "entityId": "1899722312",
    "entityType": "Track",
    "nonce": "0x39ae84c6985fa380752273e0ca7d4cd79c902e1a89d44be4fef9f5b25b4fdc2b",
    "signature": "0xd5f4e908d7d16965a7fa12a6bca510318ff18881888c3e5fe764cf388feb69642a4179ec8f750278de5d0a014dea077b7ea9deaf1e17fb54acb253269ebfe4d01b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}