{
  "manageEntity": {
    "action": "Save",
    "entityId": "1178453549",
    "entityType": "Track",
    "nonce": "1787798925516729390",
    "signature": "0x4c3e877581ae040d77a0c97d5ae34e0450f2b155e948d3ea67e6d6b6a089df4555a8a1f9cbd4879356f1aaa9f5cecb5a6af45b19556b42e9143e744cbd6152381c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}