{
  "manageEntity": {
    "action": "Save",
    "entityId": "679138946",
    "entityType": "Track",
    "nonce": "0x203734f843c699c0c0dd68f3032254046a7978181db2b64083c401c7fd217da9",
    "signature": "0x03ec58e1454417775acdc787009c3c1091454e619d7ffc4e88104ada6d27987211941eeafb23958d2f42063b36703c53887d51684eb0a55772994c0b7e91561c1c",
    "signer": "0x2B171214e998033E806F72301307B2160CD94DdB",
    "userId": "489165782"
  }
}