{
  "manageEntity": {
    "action": "Save",
    "entityId": "1847040270",
    "entityType": "Track",
    "nonce": "1789075875898236363",
    "signature": "0xfabcfffb8c9e832493a6544d037f6abb5a888569470e6c72b9d2e2a2760fed8020b98b8bcfd589b767864d65c8ad46a40fe1086e5278614adaae8a85ed59e3cc1b",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}