{
  "manageEntity": {
    "action": "Create",
    "entityId": "843444687",
    "entityType": "Comment",
    "metadata": "{\"cid\":\"\",\"data\":{\"entity_type\":\"Track\",\"user_id\":52309,\"entity_id\":1315835470,\"body\":\"cool!\",\"track_timestamp_s\":81}}",
    "nonce": "0xb5ec5371aace1c6d2a20a29c9e3ad7eaddaf9996eebd8f6575829c6444908100",
    "signature": "0xe6243e9d0aac9088843a7c8c5a4847c14c1a8e7ae68257cac5855c83efc1731c7804a34cf65aaffd463506658d8704882f44a67da2e9b68500b4e3ad65d428a01b",
    "signer": "0x1CE93c43F8574f553E8071e946654066188B61BC",
    "userId": "52309"
  }
}