{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "648443373",
    "entityType": "User",
    "nonce": "0x660dc04deda6a8b3d14d613eb4ef293ad23c289f5bd66229c3ab1b6a6afe401a",
    "signature": "0x315b97cb2d2fcc22f46ff0a1e18abde5d9c1416c5d4f2a5e18826523f959402f5b8309d6e146da31e21d52caf72adcc4e37d54e2b4a95c612bc396af4ee73ccc1c",
    "signer": "0x712Aca9aA6ac07F98dcEC338Be9C15c3Dc47d569",
    "userId": "12730129"
  }
}