{
  "manageEntity": {
    "action": "Create",
    "entityId": "2059694899",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"body\":\"foo\",\"entity_id\":1408082385,\"entity_type\":\"Track\",\"track_timestamp_s\":21}}",
    "nonce": "1775809402874565373",
    "signature": "0x1d980ed6fc8b4e039d38f2768f947d5d2d33bd274d70b804341a90c4a2d1f1772399538f91763f5c593998f10985b51d8ffc84680540b6754259b7498d0120f61b",
    "signer": "0x43e766989e99A80eCF18BF165011e01fbFC3A676",
    "userId": "319129"
  }
}