{
  "manageEntity": {
    "action": "Save",
    "entityId": "620869114",
    "entityType": "Track",
    "nonce": "0xc801582faad2810b8600a53bd4c2e1feaf3f255dbfbdb0dab6c8d270ebf0338f",
    "signature": "0xd5c98bc9bbdb14d2bf886673f9b6070bb6e6515fe6e50268b2e6523e90ba1a1a78206f4439c313fbe542ef37b61883f2ce7636e5843bbe76395e33788bb3391f1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}