{
  "manageEntity": {
    "action": "Save",
    "entityId": "1221742429",
    "entityType": "Track",
    "nonce": "0x1ab602dd20a43412d2cc86127c72186d3c8e74b637e4885325b069e86147f2ef",
    "signature": "0x5a3b33a21ee01e5e42263db28e2bfcfa10908e043c8927cbc718363e40876b83308d2dcd926aa25229a8c92082d90ce30ed8a27af266b77e89342e92bed0abca1c",
    "signer": "0xe5223Dc6E411A24e22DcF917955e97a8D7479d0c",
    "userId": "981716494"
  }
}