{
  "manageEntity": {
    "action": "Save",
    "entityId": "1464809369",
    "entityType": "Track",
    "nonce": "1788932592093330152",
    "signature": "0x42d2064e7dc3c10862fd652e9865d26cf083d11ed8cbe6d58ce726a23cb7cacf60ea34818896b95eb53bf973fd2aed6616660081dc24f0d2e5911528371c5ea41c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}