{
  "manageEntity": {
    "action": "Save",
    "entityId": "773076584",
    "entityType": "Track",
    "nonce": "0x8ee8b8406d1c0e61248ec816b45b8aa86cbe7c654ab27d767d46ffc5bc7c417a",
    "signature": "0xc758c318392543963390b18285e80cd803c3c8bc86f5570697dbc8cb2b4f4a9b08008ef3dbc69d0f82ba8188fcd177892f2ac03649d1905259fa5eff9f6495841b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}