{
  "manageEntity": {
    "action": "Save",
    "entityId": "4281",
    "entityType": "Playlist",
    "metadata": "{\"is_save_of_repost\":false}",
    "nonce": "0x194e81f88c24738f95c8c225636bd1bee11bcef9211c38dc9cd6bb1ffb0ef7b3",
    "signature": "0xa560090fa74d6937cf028b68523a11b16ca506385a8608c6ad5be24eeaae36e13834c8bceb9deb0fd08c415520ccfc7901ef5f0e196bf63f8291d82999299b481b",
    "signer": "0x78b2B7e701b9EF7AFd8D1aDa8D82b2e90036f645",
    "userId": "529243157"
  }
}