{
  "manageEntity": {
    "action": "Save",
    "entityId": "319867",
    "entityType": "Track",
    "nonce": "0x307e4d6722c19af818fbec9f97ee81c8983884554d31cf0b927d1fbb980584b2",
    "signature": "0x445cd53b794099e9e699acba4fcba505450f123ef3b7bf10dd2b1efceb72ef616c346b2703f8f0a3f5e268fd10b799eee8490a0fc90eaf1c5dff3a60924bcf8e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}