{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0xd32a5471a7758db1f5cf07d15d3c1643db90336613cc3ff2cb091f3d1c905f12",
    "signature": "0xb5b8abf22d76319088e7233f16cee1f4cbf327b8bc35ad20e5a77dba28b58cb7422cce8ecddbf62e40fbbe8886253c988a8a28eeeef838051baf9d54bdf70e421c",
    "signer": "0xB081e39f45BA8ceB38DBee1315b1A8f7e126F096",
    "userId": "354864668"
  }
}