{
  "manageEntity": {
    "action": "Save",
    "entityId": "973719762",
    "entityType": "Track",
    "nonce": "0x1afc53ad94fc12e9c9be7985f00723cd43b4dba6a2562c1d597a7b61a2cd0694",
    "signature": "0x7e88fb326f82b64d30c72ca94ceffa1b83443edccb7bbe9aa343930f6d2d5dec2f649b5ef439e43bd578517ab944306ea98b52973fd1b23059c8f4171a6bb5d91b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}