{
  "manageEntity": {
    "action": "Save",
    "entityId": "1514310371",
    "entityType": "Track",
    "nonce": "1788292102297429795",
    "signature": "0xf6da38c702f29a22c2ea0c474dd1a395b55f6f896cbad06abe8e096aa49e08ec5ba6d9c25e5fc7dc729cc41f72a2b49d80b5cc4f952eb40a2b0f4b192587a6321c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}