{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "51",
    "entityType": "User",
    "nonce": "0xb4657efb66c1e678e61a688f2a06bd50ef27e14ae52f342f0603c083ca38dda6",
    "signature": "0xf90e4b2831e717deb10afb33a5f65ccb1ec055625536727afec50ebe983fdf1870a534cbebf89021e10fa0be3fe7a54c6964e67a06d7370c9f0590854ac1fcda1c",
    "signer": "0x20a821B898F6Cb6BB0E5FB2460eD4225B40Bd68D",
    "userId": "198400104"
  }
}