{
  "manageEntity": {
    "action": "Save",
    "entityId": "1429519834",
    "entityType": "Track",
    "nonce": "1790062319238912010",
    "signature": "0xf65ad402db4f1efdecda66b3fdf79c2c145cd11329250dbc5a986591840c26e6554100a2d90895734b6194621c0a1a044945b3f8afc6c5bd1bddbaea4bb75dce1b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}