{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "644958352",
    "entityType": "User",
    "nonce": "0xebc28f603a3efaabdf930a2510b5c3021841f6e75787c3852d2f6f2c4930233b",
    "signature": "0xce7cf6a4e3e70a3808c2205bb52e6669d5c51848b218c4ee7b502a307c5cad2514996c1c0a4b4edee196b38d6600daf653535087dcc0e6192eb0ab3d3f96ea941c",
    "signer": "0x9B305fd00d9a363195749eec4f162986083A6dC7",
    "userId": "648443373"
  }
}