{
  "manageEntity": {
    "action": "Save",
    "entityId": "152769340",
    "entityType": "Track",
    "nonce": "0x4567933b43b6500d2a1e75e43622e57f42cc3ef4c4c562f70dd37cbd25761a1e",
    "signature": "0x0b33b13295a46189bf0446509eb60eac76903d9484a0641d36e6cdcdfdcd94a3539e6638f608f12e1262cb93ae2ab19813c77e93124e81950188ae5a581ffdac1c",
    "signer": "0x4fdc03E53311BF6b1B8728dd0Ae0630bF74176f1",
    "userId": "162770660"
  }
}