{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "542421603",
    "entityType": "User",
    "nonce": "0x946e12eebeba22e1ea004ff4d05105d14251fbb5f4b3c9035027777b80c7bf5e",
    "signature": "0xb3f5b94ff6d555651fb5fd416a331320e34a00b204d77367b969185c4d0f8b4b60d699324cd5824d4835fedbf5d42c996e87a6065773928dd38ba21a02ded1e01b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}