{
  "manageEntity": {
    "action": "Save",
    "entityId": "463527228",
    "entityType": "Track",
    "nonce": "0x1e41064e7362a6d82f04bd1e3b884bfb9d38d1ab2b661054dead84e617cf7a79",
    "signature": "0x150abc1f4d5c42473f22e983aec2c8ec85d638cf98187c641f9aa2a8723a053d1d95586295b9cfb02e986902303e2190e490e42e38425bbacd50857f1460933c1c",
    "signer": "0x4dafC3e774A1033C5604372f17ccBDcE545f478D",
    "userId": "889450527"
  }
}