{
  "manageEntity": {
    "action": "Save",
    "entityId": "491849028",
    "entityType": "Track",
    "nonce": "0x86d04118ed9a28c40bfa85cac60b066b939db68f11895a9193c3220c96df6c42",
    "signature": "0x54c8eb235c05e14cbf02f857db114d99a5b679a7a2257e6311f51b4f2a28b0a214e3e97634cfb7bf49ff6b02569f055ddea38c3dc566bbc2c4bc394d7d5b95031c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}