{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "620500",
    "entityType": "User",
    "nonce": "0x2ca5011ed499c5a8bc551ac43a56e21fac1b32698b4cebc6a5bbfcfc37e96a2a",
    "signature": "0x7c5d869d15b0979f9c7456b272465d71d52af4591f42f84854fe8a36af97000f186bf709762793376db919cfe5f28121bea1acd59139c349e9d8d7a05c1bde1f1c",
    "signer": "0x6eF66a6206A4589bEd5849d15Bc2746C2603b01f",
    "userId": "989336341"
  }
}