{
  "manageEntity": {
    "action": "Save",
    "entityId": "542628",
    "entityType": "Track",
    "nonce": "0x277940c28172c61d8e5f5aff179f9321fc81497244e12b6e38b92e9b563c3478",
    "signature": "0x56395a042718b0635cdd553f0907db65fd8a3a09c024fed5e98451c8ab8620f9417a60ba12f841e66a30fd86bef69283906f36c5b709cdf5022b54d256b525d91c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}