{
  "manageEntity": {
    "action": "Save",
    "entityId": "679727217",
    "entityType": "Track",
    "nonce": "1788296988781851224",
    "signature": "0x5b844df73ae8ea4f534a5eae59788c8d62546622f77dc56b8e2a5a4b905807a364ee0e567afdc452d2d29848469a341e78d026ecde540a768815206f68acb2671b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}