{
  "manageEntity": {
    "action": "Save",
    "entityId": "475331",
    "entityType": "Track",
    "nonce": "0x1e43b32ef18f52ebd536a2783e241c00ed1dd4792d3fc371f52cd71cb31bfbc2",
    "signature": "0x4d0fde3491bc6553e769a3ce9395a97e38157840843848c6bf0d9284cd3d06e72c1580cb3c36980515c342807709b07abf549c14a7aba4741ddda0a8470ca7581c",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}