{
  "manageEntity": {
    "action": "Save",
    "entityId": "903318934",
    "entityType": "Track",
    "nonce": "0xe882e2fc7ba34e6cda91554664f050388832e66babb9dd1656ca36ccb37d1458",
    "signature": "0x4d8151be9407f46ae1c5ca4993366d70d937e49eb202b4e621e4d18d42eaecda509a82e068a8002eae006b3def58e8bf902d64d40014eea79c264801afaa55101c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}