{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "637372504",
    "entityType": "User",
    "nonce": "0x299e45f7044dcc658adcc179d9534461f0ef9a4925bf5259c902bfd1394e688e",
    "signature": "0x2249bcc0b6ee4af00448b3ff61861877243aa5447932903e1da8f9613aa578bc30415e5e951f5222e1ab272c2ffb17540d77a091255a2fa1d71a468c36d391941b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}