{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "683609933",
    "entityType": "User",
    "nonce": "0x15c7e8c917e866489ecf505301a3f77e85b78102a02221ec59802ab0b077a6cc",
    "signature": "0x2562a99eb2a64aa4c516785f47ff3bbcc9f0dc426b2643cbfea7957ebc253da8768bcdf476e743bf2d6f0e4c2b836cbd55b8ac4fe2f7f762e2891ce440ce3e611b",
    "signer": "0x6440Dd7ce5eE2e610F909B08098D39f89250637f",
    "userId": "503764788"
  }
}