{
  "manageEntity": {
    "action": "Save",
    "entityId": "258416870",
    "entityType": "Track",
    "nonce": "0x7a4412667345cbd2de82847ee6a862890a24a905e60db9f3a0b2fc47e7a28325",
    "signature": "0xf8daeb5b2a1a34d303ae03a3727e5a5fb8c8144bd886f84ba134bd5d6e2e2e3c6e6d99603ade99753768aaf6130374e636113c2b39e9995c4cdd50fda3e5cd7a1c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}