{
  "manageEntity": {
    "action": "Save",
    "entityId": "671338",
    "entityType": "Track",
    "nonce": "0x960ce6eae698dedc8764bae83c5109adaa2e8fb73a396c86b3dcc01d509664ba",
    "signature": "0x8def40bb9f3f28e4dcc36abb509a431e4133ada3c4d8a62954dffc55db6403260e179d62434a2ad092af600544b2aba96aedc9092bfe9f39af1a4f22c1eebcb41b",
    "signer": "0xa8E11aa224d2579f5cbdb912866bCE84Eb10f9dD",
    "userId": "951616224"
  }
}