{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "123674",
    "entityType": "User",
    "nonce": "0x49355f73d4c0ad63ee0f1487ebb8c0ba9922000d2ef9f7cf39e0bfc7979abc1e",
    "signature": "0x69893e6eff3665c62ad1bea27a7b4bde929846915d6badf2dc74770f2ae9728c2b27d5467106e72ab9d57f3763e64c6ccbff1df7a214efd21f402a0384fe2e4c1c",
    "signer": "0x21C9b5409a415E4F0923C5378a82C85B8dd3467f",
    "userId": "575912766"
  }
}