{
  "manageEntity": {
    "action": "Save",
    "entityId": "660668210",
    "entityType": "Track",
    "nonce": "0x2db7c67fd59b28f9a88223aecfa2c2c8cf254d0fff70afae0c1f23201a6dc2a4",
    "signature": "0x40ca7ccb5f4d95cb7229205778f2e51b1fb52def6dea15b8071902e4e3fce1d77102d006f035ac888c422295c0d954c5f16e3f27f1a8bf053ae3b21582d2bd7c1b",
    "signer": "0x73317E9D44b6E1b7d146760b12dc5546Cd140ED2",
    "userId": "683609933"
  }
}