{
  "manageEntity": {
    "action": "Save",
    "entityId": "68646230",
    "entityType": "Track",
    "nonce": "1785777337410077883",
    "signature": "0x369b01112794de77c3902869d52fd5a043aecaffc182eef0b8795a30f858b67a7061930d381dd6d05476d375b437099e5f893af62352c1ddc215c370dcca64831b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}