{
  "manageEntity": {
    "action": "Save",
    "entityId": "622301",
    "entityType": "Track",
    "nonce": "0x67ae3029bda3d7266ef2f3e99b44f8a32ae6e612eccb228a243abbf55d1592a6",
    "signature": "0x503bb5ffbaa5c50f709637b8cdc284ce2ca2c02ea0f1017bfeced5d9fe4f300b6cf4fee0e98572ad4657dd45580399928e53d10908c5041d99927dd4f188cf121c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}