{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "621412831",
    "entityType": "User",
    "nonce": "0x2acb407aa653b040ff67653fb8ecae45db173a4c3551d53ac5dfad57b7b37217",
    "signature": "0x65c91eba483b3ef5d1615d24e21ed6c679ab50ce20470a311b90c73675b38e1d1fb34da69545ae1c53c7bc6d4cdffd6c2f2c63c9d44584544a8abaa15129a1c21b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}