{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21640",
    "entityType": "User",
    "nonce": "0x74e37f204a0fe35a0a100cad9ecc1c72bb660d994743e0edbc1bb5024f7996e5",
    "signature": "0x5b78fdd18c77936237871b2c63bfc87bca0ca71a2348cb659126fdf41d8c7e9a4ec929fe365151a499c4f5e533354cad312a3dbbad1e0ff8f7442e6e19d20b2c1c",
    "signer": "0x4Ff77Da6D5C7286ea15F7F94FdCC04a641dE9a27",
    "userId": "512734349"
  }
}