{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "210821",
    "entityType": "User",
    "nonce": "0xb91040be94e4a0b6ffb983c2dfc0ae1b2f7062fc6dc98207dbe4a4193a4af3f1",
    "signature": "0x49106dc03b73aa417aa0f82078d2b5405adfed765a7afde2760501846c0e80b134225cb22413b2c11e2adc22250db80634204ec9ad186c4a1a42408754dbdbff1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}