{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "475900419",
    "entityType": "User",
    "nonce": "0x53a457777587b872a65f720ba6a9fdadda5223982aa94d2d121a9057a3aa42d4",
    "signature": "0x5f814ef5b4788670c973defd55d49ba10e8b47a22a5c81f737699b30287e87233126bafd81f8bb6ea2ba93ea882b8dcdb910bb3a1b6d8d7541aed2faf3d1d8bc1b",
    "signer": "0x408CbFDbc09C9aFB99Da5f010D04f50A190b83B6",
    "userId": "675830993"
  }
}