{
  "manageEntity": {
    "action": "Save",
    "entityId": "302611431",
    "entityType": "Track",
    "nonce": "0x120eb5f66c378a25d405a077aaa49c0510b16213fa8d9475424cf9580f4c0ba4",
    "signature": "0xd2b50596fad5a7fb48995dd2a29a8fae45e9753c17ac121cd502aabc2a368c766f2d134f4e3e36ef08df0a0511e729051c713bbd290ca532d6a9121eb9f6acff1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}