{
  "manageEntity": {
    "action": "Save",
    "entityId": "1638414465",
    "entityType": "Track",
    "nonce": "0x1ade28fb383e065949fc10ce1a7a377ff35ad852653e8c7f9abb4200de51a8da",
    "signature": "0xf1a35fc0d91d3adc90d0174e5529fd20a4bafd8e0fd06fccb9f1eacb25d1bd4f520cbde20cc1912f08b549dbaa657d71de1a2fbb58f5802be38170d2e8e7dd381b",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}