{
  "manageEntity": {
    "action": "Save",
    "entityId": "376959061",
    "entityType": "Track",
    "nonce": "0x5d4f38ff4364c5aa697e49a2eacd843447c89984f4239596d6cf08ec936ee048",
    "signature": "0xc9cd051adf5b33cd5f470d21430994d2e9c52c7d4c8253c2ecab9379d5f8df612a958c0301577b497e225c99c26ada21cfb774f8e6532e5b2010f8f65d6802cc1c",
    "signer": "0xbe916820AF010608151C80f3A74F7c83218094B2",
    "userId": "881446128"
  }
}