{
  "manageEntity": {
    "action": "Save",
    "entityId": "2018400537",
    "entityType": "Track",
    "nonce": "1793068185815827878",
    "signature": "0xd77363c29ded22d75d3d0bab081462517a016423b813bf67bb541b19daba8cb87bfd18faf4a5fad37fe183636b85d05b1e6b3ad29fe13157926b0634e36667971b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}