{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "8219",
    "entityType": "User",
    "nonce": "0x95755a5e932edf365f7133ee3d88711e6c7bffb71f0ea2e3c8815df1acc8134d",
    "signature": "0x7e616c4c72cf41bf6c3703afc65f960575e2084197ee74dab056a797547c68c62bc3df1c3336529a43ba30a62f9b388aa4d53c62dc0072733d42ff599aad99a01c",
    "signer": "0xb8Bf68e2681FA1A8a8ce9c78070BF9644e947378",
    "userId": "12890"
  }
}