{
  "manageEntity": {
    "action": "Update",
    "entityId": "1558154260",
    "entityType": "Playlist",
    "metadata": "{\"cid\":\"\",\"data\":{\"playlist_contents\":[{\"timestamp\":1787756515,\"track_id\":1001535},{\"timestamp\":1787756515,\"track_id\":42101},{\"timestamp\":1787756515,\"track_id\":398353998},{\"timestamp\":1787756515,\"track_id\":1920936003}]}}",
    "nonce": "1787756515800676009",
    "signature": "0xde13db1b77ba271ca49f6b8fd398b3c9183dfa792e2ca4be2fcc2ece1ccfac9c5743ea4aa1649776d7a895f38a21133c33a0a028ca5f8dcbd3061988c3999d821c",
    "signer": "0x922cb2AE695da9f7Dd0e556954c23eeeb8bfFe0E",
    "userId": "81674690"
  }
}