{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "639977873",
    "entityType": "User",
    "nonce": "0x49376af70a0c47a64d2e01a00348250542331ea01632bcd6647808eec3a0fdbd",
    "signature": "0x6985313d7372bdc0abdcf55e389c707f7e32ebb381882a6882e097b6623eea622609b9a2c0728669012b1ebeb63fca3448957d4a3778e9d8bc2062ddfc46f6001b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}