{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "3407",
    "entityType": "User",
    "nonce": "0x3c67a02a7995d4387d48ec9d31b6bd592957a1a998091d7b0758074f4b1735ca",
    "signature": "0x76223f3b3748abc64a8a3c68b4d326141843a861708010b8ba5a17112c2521de50f4ab733b963835c0d54f5daf6ec06dc7478d8f7da5a8f282eff9e20fcdd1e11c",
    "signer": "0x257c9f4A9563d6A4a2bF3be7Da1738e167fcF295",
    "userId": "301719964"
  }
}