{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "621557",
    "entityType": "User",
    "nonce": "0x91239904f33b12a1fa025a5be338d903713af5d3dbd40846f188da9841cb6a1c",
    "signature": "0x868880787f7cdb67b674dcc11aa5e6bbc0814c2ec8019c49afc02966edfd3b2d18e3b1025d282fc52ad648c1bf94fcd8247bab7f3bce91c1d9052ddd7ac7bada1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}