{
  "manageEntity": {
    "action": "Save",
    "entityId": "1199335687",
    "entityType": "Track",
    "nonce": "0x294cfc59eaecafb9a527a8fd99852c23b49035d67cd266d4f5318356c5591be8",
    "signature": "0x67387bac8530e6920a10b17e29667a93b3d6a78afe5a5ecd126a33ee08107e1835102e1137e7d680e1dbbb6dc7f85246d25fabc90215bb33266a66fef271a97f1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}