{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21640",
    "entityType": "User",
    "nonce": "0xf525c5f2e2cabbe16b13dd08834634832b2b3ff4db3bd856ee4c00789e4bb878",
    "signature": "0xae07cfb56df6770977a7e14130182ab7962a68d15ff18cb15fe775275bba23a46db0aefd2f90adf3de361f270e93096d1651e57a3d0d33a9e328c0334db066a91b",
    "signer": "0x6135DFED4766632f3E2e097527cad142835825E1",
    "userId": "312072568"
  }
}