{
  "manageEntity": {
    "action": "Save",
    "entityId": "303420011",
    "entityType": "Track",
    "nonce": "0x21134ae02c2af6a9107402b7a704aa20bc0b20db9f73ebe0042d12036e64dcad",
    "signature": "0xb2f4a5f1ceb414d46d1f34aeb2876076bec7c4db9e7e10077d3f0c11d3e3ffd0176979419ed43006e2562cd10c4fca6a92ca41deff3c9144d709d4019a7fe20e1b",
    "signer": "0x59765b22C96E88dA578af23E8611d6ca2dcCd7C9",
    "userId": "377610060"
  }
}