{
  "manageEntity": {
    "action": "Save",
    "entityId": "1580591368",
    "entityType": "Track",
    "nonce": "0x44b5f2cc75e66a4710d9890d3913eea84e47d40520e07c59f411938e3da1f63f",
    "signature": "0x597e3fbd81fff739f39733e48cb8bb4ea31d1d008a95f9a463b4ecab8d92af5065004caf51660fc44ea1e3ddd6905b003fb0c5ddc97c57d158d66acdc66207631c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}