{
  "manageEntity": {
    "action": "Save",
    "entityId": "548227676",
    "entityType": "Track",
    "nonce": "0x0d00b9771366a73e3dcb948893844284ce2575d2d8e2227f020713d740512efc",
    "signature": "0x16aa0afbbeae17f6d0d6737e8129672ac3d785fcbd7e413c9bbf76b1ea07930b01f550340136330ca3131243833dd49b23ade7a0feb6a93b2928984c95118d401b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}