{
  "manageEntity": {
    "action": "Save",
    "entityId": "400407417",
    "entityType": "Track",
    "nonce": "0x358ed56d9e87c01cd3dc497971e3a5ea873da71ecff362cd889923258657fc01",
    "signature": "0x295d21e09372aa246eabaf23c9672893c95aac2308584357a5b892ad9a9014437bbee54147829f35465c08fc405ae569d045a0a4d4f95e3358ec078686da8ca61c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}