{
  "manageEntity": {
    "action": "Create",
    "entityId": "829148096",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":20,\"entity_id\":601708128,\"body\":\"nice!\",\"track_timestamp_s\":48}}",
    "nonce": "0x0c99a65abebcc2443f5a09013f85e378c2f2d529f80e86771e2fce9df0d7da22",
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    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "20"
  }
}