{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "300991",
    "entityType": "User",
    "nonce": "0xcba26a7d4f1553e68e946fa1a8b91191e1ea728de82252f959772b4b1f86d127",
    "signature": "0x63640bcb4e42cfdcff4ebfe2ada40ccedae8408fd94a9ee4f7277be69f8172030d6af36d858e4d452dedd77ec2703fae03063e85edf2eb18217ed6cba93e606f1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}