{
  "manageEntity": {
    "action": "Save",
    "entityId": "707899537",
    "entityType": "Track",
    "nonce": "0xc45c113eac0b0cd7f3ea60cea2af51ab08f3823e1e95a3af7ce4cf62078d6099",
    "signature": "0x155a66e94421ffbea6edae36a1029ec9acfa8ddce6685ae9ee382f25ff86641d56dbaf9b1c2e2eebb9eaa84ce4c27fa2b198687bc9990a448f446f78e16646651c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}