{
  "manageEntity": {
    "action": "Save",
    "entityId": "1452109868",
    "entityType": "Track",
    "nonce": "0xec33eeef28d19a11eccc9a16ab6a38f3fc1aed725d4078edafe65c1290354c10",
    "signature": "0xc38d1c8c1d1fe9b2851b018cf8a8e556390b2b28c3536cfee1e7dc7f75df5bc60d4b97ef29b615d99681f9a27cddaca484f28cd43ef23b8e59b6e7ffe7b926721c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}