{
  "manageEntity": {
    "action": "Save",
    "entityId": "1864900337",
    "entityType": "Track",
    "nonce": "0x496d6e5abe6c83074931e925936129fa28e0099c00bdff7a2b712a40e8ae2d48",
    "signature": "0x3466c3fcd0dda03b7ef63eda346b9b327fa4aa90972fe1ae5482ffae45c0bd915600b71ac142c23ee37c075a1ba6d44e139f980daa7079805eb979d8346f997c1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}