{
  "manageEntity": {
    "action": "Save",
    "entityId": "1490703411",
    "entityType": "Track",
    "nonce": "0x5b1888dac201d5032a0605b71c864b185a069d1c829e4d7d1f878980aed16392",
    "signature": "0x2be4c13b45cf7f303f446e250d0621728c58526e62c035f8f73ee0ed93eae05d6cff42c0a2411c2851a25da6c7392a559b1e329d8ee788731047df840caab0b31c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}