{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245045240",
    "entityType": "Track",
    "nonce": "0xca51bc28bdad6a52406a20fe0f8ad0e7514899c5fec7335ffa2ca81144317fe1",
    "signature": "0x369b1c744431b3e8403a8cfddee7e2c9616220e49f5a451bff73cce203579edf20797f61ce72b64786c1480eb6a4d8c594eea6d585e79e108dc97d5838a3da431c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}