{
  "manageEntity": {
    "action": "Save",
    "entityId": "774135321",
    "entityType": "Track",
    "nonce": "0xb4055bc04c254fef19728d03f813480879354c7479ebbb435cb99ea2ca8a94a5",
    "signature": "0xe1f7afa2237a4f72625b3d84e2a7e2923684c515c876d77fb9944f0faf9e41d55f6fff36e3cf672f8a26e7edff85bc9bb4d86f38b44a2407055b16a17c4d709b1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}