{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "620307004",
    "entityType": "User",
    "nonce": "0x8b09bf2a039bc2ea374c557297d8c512f865defc0125ec119c3089356a53381a",
    "signature": "0x9a0421d0cdb6b9a5b13ea9546cc2c1d2251c6e3c77edd14932fcf93fe63acccd0ee2ccdaaa3711997d8ad42416b0a260342e8c550f7c9c9ce9e11c764b63b61a1b",
    "signer": "0x6Af6D40d1d0B48D79D2bd3E3c8f0a45540130c0F",
    "userId": "89433"
  }
}