{
  "manageEntity": {
    "action": "Save",
    "entityId": "573477424",
    "entityType": "Track",
    "nonce": "0xabb8a276b2b61d04fd3d72ea4314398fbf78a9a8a556bb1ce8f6fe16db9954eb",
    "signature": "0x86a6f0e6162db450d7ea3e02d44792f69da7c7031ce76b2ba493b2556a0f1b940fe39a5bc828f0c1e7f7dc967e1e2804c174fbed464ee85f505edbbbc68d00f81c",
    "signer": "0xD7c3dC9EEf2D94568C0e1A9C88b58696850c7C22",
    "userId": "125737"
  }
}