{
  "manageEntity": {
    "action": "Save",
    "entityId": "1286476334",
    "entityType": "Track",
    "nonce": "0x97f10b273b4459cfc619b4641d70f219ab7d443a621b5094cd036efbbaaa5040",
    "signature": "0x45aa72b326893be88d710291e0dd63461575e9392714f8cd15fd91b146f2b87339f8f8a60e6a5071422cdc30d2c0a5b7ad9ba42153e80479998d3c871352923a1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}