{
  "manageEntity": {
    "action": "Save",
    "entityId": "666140",
    "entityType": "Track",
    "nonce": "0x79cc873d1d1587d81dd570d7c34846b3eceba076fc8c91fc4ad51b6aceb3a1d4",
    "signature": "0x70616ee5c879d99bf6e2d5e64662e3aad195b71bcffa551c45e199b2343b7802054782d97f463b613dcf04282b4af273bd195907856c35c81fb4f8f975c478261b",
    "signer": "0x5452f86EfcB1153FF9C10bdbe4103Ce25434D124",
    "userId": "620307004"
  }
}