{
  "manageEntity": {
    "action": "Save",
    "entityId": "250196622",
    "entityType": "Track",
    "nonce": "0x4c4442eb60182dd5b28f6cf2b234bc7b6f04970f475fcd4d02c3c09bcc8aded3",
    "signature": "0xc153f082d9a3e7e5e81d53e74828bb0fa6d082db3c6c339ebffddc07b50c4def0833e7ca4b618796a6e37c783b7c9d9530419879856311b363802d58167732a51c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}