{
  "manageEntity": {
    "action": "Subscribe",
    "entityId": "21234",
    "entityType": "User",
    "nonce": "0x7b40b9ffcb14b19fead2272b35c6107fc796a751806050942525c24252cab664",
    "signature": "0xa20fada543f45f246a819174e3612b33ac62af04b308b0458a793ba2b98a14431f09a0175418064f9bfdc4a8d88fbe3225aaef88ae908ae764fb74dde0f643ac1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}