{
  "manageEntity": {
    "action": "Save",
    "entityId": "689505719",
    "entityType": "Track",
    "nonce": "1791844632329141033",
    "signature": "0xc29899ebaf4bd7adb77f6fa539a641627da8c50b5d8e705e3712a8d696d16bec549a4ad21b780d454c8d29192acc14ae8192bf470c002d035764e0e157d09bdf1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}