{
  "manageEntity": {
    "action": "Save",
    "entityId": "1452201830",
    "entityType": "Track",
    "nonce": "0x6d4b37a44c0a0a4389c1a992f82f4744103ac5f886c3e5e075ad71623b120657",
    "signature": "0xe9e76abe7093a50bc44a18d4458fe57432ea9f6d5651a20fc44ee5b72c909e330d3fe52244ac06506f2094e3065cf77733a5f6da06608e20ffcfc17b704aee721b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}