{
  "manageEntity": {
    "action": "Save",
    "entityId": "643725035",
    "entityType": "Track",
    "nonce": "0xfbb4b66a1d5641a229f6b539f198f1054e436020228a1598b40d3e3a7620186c",
    "signature": "0x9a7eefd56d38a4e55cafa5e9a696d6627da5e81a7e63376b2ad4e3c83cae7de13c7877f297135c17835e70c8b55370e5613dba4aaf4d7f15712ed662bf1dcfcb1c",
    "signer": "0xdB791822A11f5aDc830669bdADa8121a4558D7A3",
    "userId": "347139808"
  }
}