{
  "manageEntity": {
    "action": "Save",
    "entityId": "338250",
    "entityType": "Track",
    "nonce": "0xa1b3dcec833da68f7e7fca03326485ead5a7263fe422fccee069a6a5c33f0ea2",
    "signature": "0xc12538a2bba55e72c8720520f2118517c0c79eb21bf9f05ed8d6f2cc1eaee2261e74fc5967931215b3cbf8e006fa7991a36ff2f55a685e54a5ddb73d5b2c36d01b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}