{
  "manageEntity": {
    "action": "Create",
    "entityId": "615846688",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"r u a child\",\"entity_id\":917953791,\"track_timestamp_s\":33}}",
    "nonce": "0x762513dd00a7de9b0e24052eb48e9f3c1e30971acba4ea763c08bfae162f7929",
    "signature": "0xcf55c2934cf5603d5861ea9c663b920cc7feea3304c94cfeb1d7ac92f6836979629605df6db89e22a13b81bb41c8ba6d0dbc0bce61d68ce1344f4dbe123df86b1c",
    "signer": "0x21a7A27cB4B4662C0210B787b56aED1436642E2E",
    "userId": "645523947"
  }
}