{
  "manageEntity": {
    "action": "Save",
    "entityId": "498301137",
    "entityType": "Track",
    "nonce": "0x7b4bce5f70fb3bc3729519b6c10e4490c3c90affeaa61fefeeac984c8de7dc06",
    "signature": "0x7c720976af03b4afb384a00ca3d820cc329c13f011da8e88bf05d74ba87091a6615ed5cc19ca623aac3b91bdca0a941edde882b31ba85806173bff94ff24f6271b",
    "signer": "0xC6f6979d7215C4611Cd7aDb30a42B2812294262c",
    "userId": "55290787"
  }
}