{
  "manageEntity": {
    "action": "Save",
    "entityId": "1659670041",
    "entityType": "Track",
    "nonce": "0x8283aaf4d4aafd051e816c4c2e19104f90ee5900330b9de62532c5796c2df746",
    "signature": "0x940d802dfb2e65141f0cf048b831243d8441e95eab2decca4777fbf77541b3512a25c4f31b9303075249e2d45b0023cb71b76d7c036eca9b016a4c7e1e4027cf1b",
    "signer": "0x040629E31a68119093b9a0111257C8449c2f8e10",
    "userId": "20"
  }
}