{
  "manageEntity": {
    "action": "Save",
    "entityId": "1029452687",
    "entityType": "Track",
    "nonce": "1787418851535465272",
    "signature": "0x67d5fab04bc918c1d65baf121e7b3c9d9069aa37e962161c50519d58bab3ccad164dc69074cb611b221ce9f51e38cf306493f0c3bcbbc8dd6ab1cc13fa6e03f31b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}