{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "506789556",
    "entityType": "User",
    "nonce": "0x5c37954852b499bf6a0dfc220a11b034a69a47a80103c0d19e1388c4e6285e9e",
    "signature": "0xb60d9a83e2e83c360a047f7f87bb104708ad75db9ae616547fc395bbfcb510a104ae9afe0f4e198c5252f3c10a4a50b8a7e20cf00b7818fe31feabeb0deb05a91b",
    "signer": "0x19EDB4c1a8740c323f6e57B80F3422C01875289e",
    "userId": "390804"
  }
}