{
  "manageEntity": {
    "action": "Save",
    "entityId": "299104529",
    "entityType": "Track",
    "nonce": "0x8bb8e1547b37dde322119b7d2e9dbc33d35a5270d01af20262769727dd4ad641",
    "signature": "0x278ec0576798f91325fcfca3971a753db7bd098ec114f95388c5bfa0cca2aa71018c2f2e69927b7ab9dd091116c45cf3b1379a99588b6d4811da96468fedf87b1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}