{
  "manageEntity": {
    "action": "Save",
    "entityId": "125270828",
    "entityType": "Track",
    "nonce": "0x903ce01dc0d6a7d0e5c76305f77f872008321a53e90682b474261f72a240609e",
    "signature": "0xca3fc8dda6e742d6e327f8714e3abe6618d7ee7922e6f5dc35091501341ff9bb3eb74ceb1ace108650a02643371fe23be3d995823c87eb0f4f0ccd5718007f901c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}