{
  "manageEntity": {
    "action": "Save",
    "entityId": "453693",
    "entityType": "Track",
    "nonce": "0x2ba9db93eb4d80e2efe910f330bbb64b07943a3955317e142c685d2b6ef5a45e",
    "signature": "0x1cbc34cc5ccaa99a4f06214c80e19409deb2fdeb9d2c0ad6cfe745398e1b7fbb51fdee29c7ebb451b070788731a806d4f2ba13d36143b0534aa2e35d1fffb8fc1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}