{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "390193787",
    "entityType": "User",
    "nonce": "0x509e225c32952937d658ab28cfb204e52e84886acc0fcccf7c272c152304d599",
    "signature": "0x107047cc2cd4be87545d7fff0c2e10a8e99dab5e6da33793f6b68afca86bdcd74802a11f9ace254f24c0bbfbd668591deaaad6d16628675835abd2e1f7941edd1c",
    "signer": "0xffE38699809fD74787DA4B1e8397af4BD3429666",
    "userId": "394456316"
  }
}