{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x9b4fe01dcf5c659ce8024b2b0619efc137395246b3bdeab3eefb7a2d29722892",
    "signature": "0x44aeff323e365af5f326777a28dc872120a30f645da616c10ffd0dd357ff40cd571d8e40def611a68397a94c0cff3ee60392753dc8e1b146bcec9c8d6837cedb1c",
    "signer": "0x612b7ae880233A125DBB9B8bde4C788Ff55E83BF",
    "userId": "897198431"
  }
}