{
  "manageEntity": {
    "action": "Save",
    "entityId": "505756896",
    "entityType": "Track",
    "nonce": "0x7ffa50434b30535eceed9755e943109864cd7cec3796ab05d02a284b926e5085",
    "signature": "0xee95bb855d80f4b9a84433b3c4a9781d77e340992f4843b4a07ffd9bbef2fa392e1da6c6a0507d36f6c54580c2a7cf5fcb9a0b9d7f1f511b7eaf8e1c31aa79401c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}