{
  "manageEntity": {
    "action": "Save",
    "entityId": "602873",
    "entityType": "Track",
    "nonce": "0xbfa7b7efac720b01ef422699dba4d8d889aeb9493075997efe40c9651943c59e",
    "signature": "0xa88c36a36e33d9233dc6de939c3623502b7202cca34ddfec62c12e0e7a1ba06839b774b89dde60cf179fe7103c9ef7f853da191777704dd4f06a5eb7ddf30cec1c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}