{
  "manageEntity": {
    "action": "Save",
    "entityId": "57894489",
    "entityType": "Track",
    "nonce": "0x7744941ab1f33a89413b0b711e0ed4c39236e7257b3390e98a7c2ef80681a673",
    "signature": "0x6b9f05ea776e5b6ebd1f60b9a91dfe0c961a06c4c6b9a32b4acb68cbd2f58b013842b922d7f8e895652c67779aa09bd928628fe96b1a485526d421b290f95bcb1c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}