{
  "manageEntity": {
    "action": "Save",
    "entityId": "686755301",
    "entityType": "Track",
    "nonce": "0xaf3ce6e7ec68245eb43a96bb9f9480031edf06058c46d91cea7db49ce4936fd0",
    "signature": "0x50926112192bc0f095030760cd04dab8a556e1d014cd8e1f915b1461f33ca3a557bc5b13dd959f4c0ff9df4eab6ea3ce22049e9778197865cab27f50e8d9d3dc1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}