{
  "manageEntity": {
    "action": "Save",
    "entityId": "446741",
    "entityType": "Track",
    "nonce": "0xb92d15be47a340c77e106d49f81a768c603e8feab8c7ee560270d707f0329c33",
    "signature": "0xe81ff79d741e3bfe74f215d45919be09baab1c27ee579b3d22178a32e520c4590f7b299d9370c6ede238b2c98431a42ed41797ef876cfd9cffeebdecf2bd49e31b",
    "signer": "0xb5f9C2ca7cFb9c2B6F6D3E7630A262041431d424",
    "userId": "357762"
  }
}