{
  "manageEntity": {
    "action": "Save",
    "entityId": "136064",
    "entityType": "Track",
    "nonce": "0x50090af1f885bca966d56d756a192fd7015ba1f5e4d7f1e4bc35390f9878d400",
    "signature": "0xf3fa5c6b420829a6bdd799d51cdac987e9c1956c7d1689c7bb47b9395d5fbc2e6397d53cbdf94cc8fd23096c226bd24a0bf7cb726ad39f075f3ec944ff40c1971b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}