{
  "manageEntity": {
    "action": "Save",
    "entityId": "545579",
    "entityType": "Track",
    "nonce": "0x450a0de9f6011c6703444686cc600bf8956f79ecb4b951241bc47654f37b5573",
    "signature": "0x593e1a4659eab05ccf5a8afb8d033428cb9167547eb934b3ab2d5ebe54c0539b37cdc47fdc717fb2df6674efb39a5b2140289886d331b76012c03069c881b6621b",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}