{
  "manageEntity": {
    "action": "Save",
    "entityId": "1616050645",
    "entityType": "Track",
    "nonce": "0x155663b2bff4296e1ee3df4e5e992562c12c8bfe7032e1403f5d9be4a6f21112",
    "signature": "0x013d353ec797f58e834405068afac52fba1827af63d7c7a000ff80e5e5262d696836e78ef0002774107dd5fbe4d6fedc8f84a3000761d4e9590e8548072144be1b",
    "signer": "0x5abad058d33E1C0C0A69d85BA3181678C1721765",
    "userId": "632918751"
  }
}