{
  "manageEntity": {
    "action": "Save",
    "entityId": "1739334817",
    "entityType": "Track",
    "nonce": "0xc7cbea42f02bb3a9658c053c248cfad79131fbd93ed2315544a1e295a70dd479",
    "signature": "0x535b18992f8d3363d331017e139920eb32fd661bddef530b939777c9e1728cc9064fbc56038e17602626d86a550122d4a32e278677ce2b00e7a0b32106f56cfa1c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}