{
  "manageEntity": {
    "action": "Save",
    "entityId": "1512352672",
    "entityType": "Track",
    "nonce": "0x3bb4ea76b33dd2a25d98772d1cf9de6b56c74889a1065b8011e466da6e13d0ad",
    "signature": "0xd72a4f9d4cbde730519c8fc4d2b5dded3d25392fc37450dfef75b51d6790c8515fcf35a7176cfd20869088db3959ff258f1ac7254b60e1f6282cfe53fe8ea9751c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}