{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "540529323",
    "entityType": "User",
    "nonce": "0xb5278eb7dd5cf3bbf6881f43591b84ac072ca2ef209b66c58184710083359649",
    "signature": "0xef63600c4261869538d99a98b169367e5888dc5e70b93240def6ffbdae8f00664a759a103dcf57a3ae7b66d66765e160ed10bac388534042882c4a9bd71cb58c1b",
    "signer": "0x15A1679B5B40F95A49D54741E1993518dc9C2129",
    "userId": "819951979"
  }
}