{
  "manageEntity": {
    "action": "Save",
    "entityId": "544188",
    "entityType": "Track",
    "nonce": "0xa1edf6456f2e561bc22c8c13613cc98aa42c63184156edeb8ef4af9f8725b158",
    "signature": "0x465dc5a3b9b8d945158f4abfed44035c0f7cd459ffe1be9d8ac23d452d1a74516a24613f0cc320a2ba22fe16d19a6d4ebeb088411f5cedd077285d63209a7c051b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}