{
  "manageEntity": {
    "action": "Save",
    "entityId": "464964584",
    "entityType": "Track",
    "nonce": "0x65a231e33e4100f8edd84425640e47508260fb4b4bf89b419cc5f2626c24d604",
    "signature": "0x9f3d368c6d2b4e06cdcea292c812e46c1b71bca745dae52e12ff7c116f33f47c3729522414d4547e2f6b84eea94d0aeac8465af8698a12e52cd74711fc68c9f21b",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}