{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "190321",
    "entityType": "User",
    "nonce": "0xf9fcab3d643456ac81857694f1e1b24068b39061e3a2c3be9389a98edf4cb4e2",
    "signature": "0x957a05fa1f2da9b4e13504487fc15d113272e5340a535e2118f394e156ba672d0c3bedfd47cab219fce0b44c71f3352307e86f8f055a3e8bdd1db2bf0614000a1c",
    "signer": "0xa603e9487Ed7C3C62E8acb85f8f32acFf5d6349b",
    "userId": "278135553"
  }
}