{
  "manageEntity": {
    "action": "Save",
    "entityId": "450190671",
    "entityType": "Track",
    "nonce": "0xdc05ac73881550da5b2227576e05fd61e9783dfa5e082466241b02d8d391608a",
    "signature": "0x15e05bedfe1ed64734e1f1d6eb7be15eda187aba969eeb659d3557ea29d008050b760eaa2b006ffd26273e8b9e0b8523c3bf025274e142e08db13761bf5ffd721c",
    "signer": "0x262a2A1c96da0dFD6f33595c8D775BefA860d02e",
    "userId": "486490947"
  }
}