{
  "manageEntity": {
    "action": "Save",
    "entityId": "445479376",
    "entityType": "Track",
    "nonce": "0x94649a010c9a756657047c456acb6800bc8dd6a6a631acfe99a1c590f64ede85",
    "signature": "0xa21897abdcd774e7ea7899e34cd7c1afcba28ec50e265b2244c65a3b6f7dba9b5da8bc929b7010976dfa1868c1735c5912888bc721aff80328af46b984d431bf1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}