{
  "manageEntity": {
    "action": "Save",
    "entityId": "479739334",
    "entityType": "Track",
    "nonce": "0xf8fa30869b1059df4eda15e26a02d641ae0ba1a937cedb5f8801702c5e8bdb0d",
    "signature": "0xa7535d8398927a2ab478038f3626fb0d47ec52b6a62678e6c0a861498e205fe332ccf57d8a30f34b1d255b519f831c39e6bc85d94101b60acd90220e6ab5369e1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}