{
  "manageEntity": {
    "action": "Save",
    "entityId": "154115879",
    "entityType": "Track",
    "nonce": "1793578184965375339",
    "signature": "0x731b3fed4e6d1e59df0a03674ad8a60f82db8ed55713bfb978f8adaa76cfebaf487514cf9a9660acaac2bb8f4529ae8b92fbd35a885a60402ec6b200b466d1d91b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}