{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x3c79b60fe630f3f8a2044db6983ec96b9f5fd112d36fbdb6579c11a0b375e2ae",
    "signature": "0x86967f7a55c940f0d8db664fab0126c4f2de02096aa30a07168443ecb8d5bc0534a958a6bb174ba3edf68fedd70b873e785ac80f37ed374d6b0d146390229ce01c",
    "signer": "0x499499d5bBfD6d922f23bD8B3CFEEB75BbFb2aDb",
    "userId": "952795514"
  }
}