{
  "manageEntity": {
    "action": "Save",
    "entityId": "816987",
    "entityType": "Track",
    "nonce": "0xe3b99887dc813354ac048b50ac31850c4e906ae927cc9277bbe74899d87fa987",
    "signature": "0x559133b66b3581a3fe76a889c715022849689d3f5af7f3be0b3751d6d0478d472e1d3d52db181848bc2213e79bf42e336e763d0b7848ddfbb9eb54aaa10be1de1b",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}