{
  "manageEntity": {
    "action": "Save",
    "entityId": "1518762192",
    "entityType": "Track",
    "nonce": "0xa8931c9554e2c258c63a98338afb814d756dbe98d05a11e2d05b505371822224",
    "signature": "0x586a0e874863c361aef9bd4351323a25657f12c6bd8ca52def60979767bc69315a6bf2aa41130df6b3214f3cd24cde1637e1a8da8180f8a2b2a993860d97aa921b",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}