{
  "manageEntity": {
    "action": "Save",
    "entityId": "1003153171",
    "entityType": "Track",
    "nonce": "0x4c0855378f3607910c2451ab4b9feb1d13bf9025a99683be3305f016c6a3a186",
    "signature": "0x114efa3d5b28ad4f9e0a8f27803c548006e06779e7b9f15041a2026aac9d5ed12bd0cc9bcfe59054d2bd56d5650ab35143b32c1f618ac1d317663a2e6cbd31e81b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}