{
  "manageEntity": {
    "action": "Save",
    "entityId": "1291952453",
    "entityType": "Track",
    "nonce": "0x39807e3caf9ef3b5af08e002ba51d2ef913003d075894869030136537bf0df25",
    "signature": "0x6fcb5715dedfcc7a966d19ce2869c348680f0194d56609014eda1d63f9cfd87401d3d833cf15f803cb5713fb5e2752bb76b02e15d0bfc195acf62451d93ec9141b",
    "signer": "0xAfE04b3A47505816aD72A3036422AC553C1dFEc3",
    "userId": "515307498"
  }
}