{
  "manageEntity": {
    "action": "Save",
    "entityId": "145566902",
    "entityType": "Track",
    "nonce": "0x6ed709a3f6b9b0a000f7f78b879e5cbbf50023e408fec380724f48c73049e83d",
    "signature": "0x734304b42620e6b37deefae9026653f5e61c15d677d9b83c9cda7f1adb7e56dd7a64c01b51fc5b592291bc6dc65c1b5f294a14d8668c9bb1018b6c32d892fc0d1c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}