{
  "manageEntity": {
    "action": "Save",
    "entityId": "628948",
    "entityType": "Track",
    "nonce": "0x2e2beffc307a2d4dd4896d9a6f1873ced7af0da23a26dc574ef387865809601a",
    "signature": "0xa002db315a5fa1f6b67394808a82a44f378dc3edc6d2f76c011391dc036cdea6466316b91ea53d32fc0b23d5306b7134cb69804e0879069a04ca6d38cc0aefd11b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}