{
  "manageEntity": {
    "action": "Save",
    "entityId": "545670",
    "entityType": "Track",
    "nonce": "0x4119ba053dfa8c50f2b654f2accab3172700ba6aaa9ea4d32a90cbd620159a60",
    "signature": "0x958ca134b70526e85e895a9f7ce8e3b90536ec711e29d15ea2234ed7163b6eb444ebf6e1edaf057317418e833af4a6d0a2664b0156eeed4d549d6791b368227b1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}