{
  "manageEntity": {
    "action": "Create",
    "entityId": "290210985",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"body\":\"StART\",\"entity_id\":1288367325,\"track_timestamp_s\":53}}",
    "nonce": "0x58188d9b56c3f1cfb117870bdc7dd4f670f17db183ea2174924483b5b63a9e85",
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    "signer": "0x9a9D8658eB66a22B3C536280FF4375B0a531693b",
    "userId": "375752"
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}