{
  "manageEntity": {
    "action": "Save",
    "entityId": "323915",
    "entityType": "Track",
    "nonce": "0x482c21bb827b523ece04e3d53b5779b8358e2cabf875eb067df51b309b243af0",
    "signature": "0xa9966113f5ad1e4e4a91eb75b221e154f1b02dc654ad681cbb278828443a50414c9931609a081426b956cb8a869a4fe5a4007191d0a4451245b78162af1a182d1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}