{
  "manageEntity": {
    "action": "Save",
    "entityId": "478455344",
    "entityType": "Track",
    "nonce": "0x6deb6df3d65a966b814084b97838714ffb6d779d76a7026539da7d9a3ddd51a7",
    "signature": "0xb0c86a93f82a9dc35ab8a2233ca5c607e6e6b46dc85ad49befc0e07d2753859b31efb85180f6cebb5feffd49403199fcb78bb059bb96d7b13ce5e878e94682a81c",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}