{
  "manageEntity": {
    "action": "Save",
    "entityId": "621918898",
    "entityType": "Track",
    "nonce": "0x827b033de1d3b5e33e67fdff1d87e3220469545ac08cd5cc37b6f273b6581800",
    "signature": "0xed168b6d0e24e6905a7e673be83ba51214cb0e3defd1ea982d990b623bb3c6b73fd6d109b646e3c2694c7d2ef1765e5da15a772c2daefa2ad73b37ddf05641911c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}