{
  "manageEntity": {
    "action": "Save",
    "entityId": "421673",
    "entityType": "Track",
    "nonce": "0xe88b925916f1211e7f74963fce9018daf73d6e7032cd9db6acf1f205fe8622c9",
    "signature": "0x3135f0b7ec888a9bb453d3c22dbff0591cffca45225df3d9c2d74acad5b862dd16669cf0bb91569ce9e9b2d377dbecb969c7efd42df871f66dcd665967c3df5c1c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}