{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "499966629",
    "entityType": "User",
    "nonce": "0x408e739c9ee9dfd8f9c1dc0b283968030d37115bbdc964086b65a1359e392e0c",
    "signature": "0x7cef1b407c7bdebfca6039e8b1a4d9edd4c584b8a0297f713e9c7bcef668ed3649d78283eeb94aaaf559ed8767d86f60b8e82522232962e9a693d3d1ab5c50711c",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}