{
  "manageEntity": {
    "action": "Subscribe",
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    "entityType": "User",
    "nonce": "0x3e037e6e92299ed83452e71910d72d33dd46951dd9ff1ee23c7729fc9754eefb",
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    "signer": "0xD24271e3B8CCFB603860EA392E94eD5AE2538703",
    "userId": "456716469"
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}