{
  "manageEntity": {
    "action": "Save",
    "entityId": "394417362",
    "entityType": "Track",
    "nonce": "1788187656925080036",
    "signature": "0x30aa82af688eb090029849c176531ac716ea9411c7cf1401b69bb62cbe20a00a5f01359af535ae4ffeeb8be9e34499e2e9aa6c00b84a74612b73a76c99eed1eb1c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}