{
  "manageEntity": {
    "action": "Save",
    "entityId": "221383",
    "entityType": "Track",
    "nonce": "0x150c43cb52d0e03a155b25498ec4f9c4bf6fa34d2f3585e680f33faba7c0849a",
    "signature": "0xf1622740feaa1964887118694e5a6bd4e172dfb5d63967f041444330be1509d132157342b9f6b5af48185b17cd2b945b9d26547c62d2e3ae7395272886e85ae11c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}