{
  "manageEntity": {
    "action": "Save",
    "entityId": "1619398864",
    "entityType": "Track",
    "nonce": "0xbb35b707853fda50c9b5c376846203c17c70ca8614085bbb017e9283edc59746",
    "signature": "0x7b1cf98378c7e21fb17c7df39a127cb1b591297563e891529f0bc0ceb389f2a17f6db7a948717529c41f17b5d1a8b2047d1a806b55240107e7bf95d6fe8ad33d1b",
    "signer": "0x0b901AE3Eb7b439095858D82Ff194CfeD0Fd3396",
    "userId": "167557"
  }
}