{
  "manageEntity": {
    "action": "Save",
    "entityId": "975169420",
    "entityType": "Track",
    "nonce": "0x234659aea5cd824e319b186bfd6321a94d722cc1fa74f5d9f2f7f10e3b2830b2",
    "signature": "0xa0214507a6b34be459aaf6ad96561dbbd916007eb21f54258cca4b9968add473379c76255cdc86789f292820582b440e9e2b7675a0d331ce07466f6428b9fe7c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}