{
  "manageEntity": {
    "action": "Update",
    "entityId": "449203874",
    "entityType": "User",
    "metadata": "{\"cid\":\"bagaaiera7f3gxhuaosrqciviaq64og6eyoefg5dtck6bc4vofjh4ddvvpyza\",\"data\":{\"events\":{},\"playlist_library\":{\"contents\":[{\"type\":\"playlist\",\"playlist_id\":4281}]}}}",
    "nonce": "0x152dbacc40874fba792335ad29957f6e4558151b8403847fc1c5aebd70868859",
    "signature": "0xc77ee802779428b82c2d2ea504abbb3d1b4a9c5ff41049ddc7d01f738c00552f76cd2e8cf18de8c9e857b14e55b9319db00241360a6ffccea3ec5624ee57895f1b",
    "signer": "0xF146DAbBEa4a64091535c0e39A419D65150Fa66c",
    "userId": "449203874"
  }
}