{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "273007816",
    "entityType": "User",
    "nonce": "0xc5d40a9f6f849bdb45ba910156ac46e4a6bc68fdaf7a5f25cfa17b0cfa9c3973",
    "signature": "0xc9c1202ffc99fd6a576bf6b9849e96c18ac3b6ee0106a2419b7a16f795fff52b58cd361f8e2d6c3bb83e7efd2f78a8cab70689861e5adc6f264b4e6ab5292fe91c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}