{
  "manageEntity": {
    "action": "Save",
    "entityId": "420620",
    "entityType": "Track",
    "nonce": "1790181372219122308",
    "signature": "0x46bb519278dea00e0d2ed32ebe795befc40ca63bf7e4838be3ad05e2baa2e228408bc5a6eeb52a62879280194a303280a7a4139fde5a0323b231bf86ff7cebc41c",
    "signer": "0x23dF8876fD80368D375d911e3CbDFd15B8e85CB5",
    "userId": "827420993"
  }
}