{
  "manageEntity": {
    "action": "Save",
    "entityId": "657575",
    "entityType": "Track",
    "nonce": "0x6daeaa6dab3302eb6b84860aed303226fcd281c87e531ce4426d16a182b5f2e5",
    "signature": "0x6b6ce2fae9adf29328ae3be3426c2da44438cee1d31ad3ce7b735aaa867a6a952b33251a26cd6452340c6115ea46d8a52d8f3fb4e81bfd0f255c85c341e5ff9d1b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}