{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "645729610",
    "entityType": "User",
    "nonce": "0x1f02c096cddc9ef8de89f12cfd49f013d02efb04a2fdaa05c8f9540a66315d80",
    "signature": "0x9f5e557d77c1542858b8e05838fd629abbcfbf647bfa6bada7b935a75a4c07cf34401b332ef79fe6c50cd71da1dfd33b5838e7dd9210276c899890377e34a2571b",
    "signer": "0x64B0DA55A684D51d3EF114Fe644eac7db132fDb7",
    "userId": "121304325"
  }
}