{
  "manageEntity": {
    "action": "Save",
    "entityId": "556404932",
    "entityType": "Track",
    "nonce": "0xba7f18cf7fb7e237e63c4cfba5bb22c273b7d3dd161026988f753054dc7e4b66",
    "signature": "0xfcecf5bfaa6f6c8ecc784d8238e86b75eef4e46aed169175c89d8b15591036ed4933f921f7f1ea1d9ed0d076e62a5f89cf311b6a4e52753b78b5ad87457a86141c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}