{
  "manageEntity": {
    "action": "Save",
    "entityId": "218161741",
    "entityType": "Track",
    "nonce": "0x783a0e9eacef0c36456c24de78bb5ce6f3d1196cbb9cb139be168280a8a232d5",
    "signature": "0x4dae2be67a0d521d76c608071bb19028a0500c9e633a4c4dbcd83f998fd399e11eda7b4347b051228da67631fe4c9b77807a5c63e5b34820a187d2881e215ddf1b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}