{
  "manageEntity": {
    "action": "Save",
    "entityId": "440737405",
    "entityType": "Track",
    "nonce": "0x06b998716c64c46c0ee1dd1bf6048d95a7af8238523e737209a840e3cfa2d5b4",
    "signature": "0xa54e7913503aee7e889f739da70fbbb267ebc74186076afef31b4113a02930cd1477870390ebfe3ebc5bb8442d0d99819985148d31133a6ed1d0c10383ca750f1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}